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【330283】2020年贵州省黔西南州中考数学试卷

时间:2025-02-09 10:44:27 作者: 字数:28577字

2020年贵州省黔西南州中考数学试卷

一、选择题(本题10小题,每题4分,共40分)

1.(4分)2的倒数是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B2 C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

2.(4分)某市为做好“稳就业、保民生”工作,将新建保障性住房360000套,缓解中低收入人群和新参加工作大学生的住房需求.把360000用科学记数法表示应是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

3.(4分)如图,由6个相同的小正方体组合成一个立体图形,它的俯视图为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape1

AShape2 BShape3

CShape4 DShape5

4.(4分)下列运算正确的是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

5.(4分)某学校九年级1班九名同学参加定点投篮测试,每人投篮六次,投中的次数统计如下:435525341,这组数据的中位数、众数分别为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A45 B54 C44 D55

6.(4分)如图,将一块三角板的直角顶点放在直尺的一边上,当 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的度数为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape6

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

7.(4分)如图,某停车场入口的栏杆 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,从水平位置绕点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 旋转到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的位置,已知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长为4米.若栏杆的旋转角 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则栏杆 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 端升高的高度为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape7

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

8.(4分)已知关于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的一元二次方程 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 有实数根,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的取值范围是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

9.(4分)如图,在菱形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,菱形的一个顶点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在反比例函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的图象上,则反比例函数的解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape8

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

10.(4分)如图,抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,交过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 且平行于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴的直线于另一点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,交 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 两点(点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 右边),对称轴为直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .若点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 关于直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的对称点恰好落在线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,下列结论中错误的是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape9

A.点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

二、填空题(本题10小题,每题3分,共30分)

11.(3分)把多项式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 分解因式,结果是  

12.(3分)若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的和为单项式,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>   

13.(3分)不等式组 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的解集为  

14.(3分)如图,在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长度为  

Shape10

15.(3分)如图,正比例函数的图象与一次函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的图象相交于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴的距离是2,则这个正比例函数的解析式是  

Shape11

16.(3分)如图,对折矩形纸片 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,使 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 重合得到折痕 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,将纸片展平,再一次折叠,使点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 落到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 处,并使折痕经过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,已知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长度为  

Shape12

17.(3分)如图,是一个运算程序的示意图,若开始输入 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值为625,则第2020次输出的结果为  

Shape13

18.(3分)有一人患了流感,经过两轮传染后,共有121人患了流感,每轮传染中平均每人传染了  个人.

19.(3分)如图图形都是由同样大小的菱形按照一定规律所组成的,其中第个图形中一共有3个菱形,第个图形中一共有7个菱形,第个图形中一共有13个菱形, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,按此规律排列下去,第个图形中菱形的个数为  

Shape14

20.(3分)如图,在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的中点,以点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为圆心作圆心角为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的扇形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 恰在弧 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,则图中阴影部分的面积为  

Shape15

三、解答题(本题6小题,共80分)

21.(12分)(1)计算 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

2)先化简,再求值: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,其中 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

22.(12分)规定:在平面内,如果一个图形绕一个定点旋转一定的角度 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 后能与自身重合,那么就称这个图形是旋转对称图形,转动的这个角度 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 称为这个图形的一个旋转角.例如:正方形绕着两条对角线的交点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 旋转 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 后,能与自身重合(如图 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,所以正方形是旋转对称图形,且有两个旋转角.

根据以上规定,回答问题:

1)下列图形是旋转对称图形,但不是中心对称图形的是  

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .矩形

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .正五边形

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .菱形

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .正六边形

2)下列图形中,是旋转对称图形,且有一个旋转角是60度的有:  (填序号);Shape16

3)下列三个命题:中心对称图形是旋转对称图形;等腰三角形是旋转对称图形;圆是旋转对称图形.

其中真命题的个数有  个;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 0

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 1

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 2

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 3

4)如图2的旋转对称图形由等腰直角三角形和圆构成,旋转角有 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,将图形补充完整.

Shape17

23.(14分)新学期,某校开设了“防疫宣传”“心理疏导”等课程.为了解学生对新开设课程的掌握情况,从八年级学生中随机抽取了部分学生进行了一次综合测试.测试结果分为四个等级: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为优秀, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为良好, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为及格, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为不及格.将测试结果绘制了如图两幅不完整的统计图.根据统计图中的信息解答下列问题:

Shape18

1)本次抽样测试的学生人数是  名;

2)扇形统计图中表示 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级的扇形圆心角 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的度数是  ,并把条形统计图补充完整;

3)该校八年级共有学生500名,如果全部参加这次测试,估计优秀的人数为  

4)某班有4名优秀的同学(分别记为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,其中 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为小明),班主任要从中随机选择两名同学进行经验分享.利用列表法或画树状图法,求小明被选中的概率.

24.(14分)随着人们“节能环保,绿色出行”意识的增强,越来越多的人喜欢骑自行车出行,也给自行车商家带来商机.某自行车行经营的 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型自行车去年销售总额为8万元.今年该型自行车每辆售价预计比去年降低200元.若该型车的销售数量与去年相同,那么今年的销售总额将比去年减少 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,求:

1 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型自行车去年每辆售价多少元?

2)该车行今年计划新进一批 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车和新款 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车共60辆,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车的进货数量不超过 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车数量的两倍.已知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车和 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车的进货价格分别为1500元和1800元,计划 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车销售价格为2400元,应如何组织进货才能使这批自行车销售获利最多?

25.(12分)古希腊数学家毕达哥拉斯认为:“一切平面图形中最美的是圆”.请研究如下美丽的圆.如图,线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的直径,延长 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 至点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,使 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的中点, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上一动点(不与点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 重合),连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

1)求证: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的切线;

2)小明在研究的过程中发现 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是一个确定的值.回答这个确定的值是多少?并对小明发现的结论加以证明.

Shape19

26.(16分)已知抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 和点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,交 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

1)求抛物线的解析式和顶点坐标;

2)如图(1),点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是抛物线上位于直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上方的动点,过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 分别作 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴、 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴的平行线,交直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,当 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 取最大值时,求点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标;

3)如图(2),点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为抛物线对称轴 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上一点,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为抛物线上一点,当直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 垂直平分 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的边 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时,求点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标.

Shape20


2020年贵州省黔西南州中考数学试卷

参考答案与试题解析

一、选择题(本题10小题,每题4分,共40分)

1.(4分)2的倒数是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B2 C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】根据倒数的定义:乘积是1的两数互为倒数. 一般地, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,就说 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的倒数是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【解答】解:2的倒数是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】此题主要考查倒数的概念及性质.倒数的定义:若两个数的乘积是1,我们就称这两个数互为倒数.

2.(4分)某市为做好“稳就业、保民生”工作,将新建保障性住房360000套,缓解中低收入人群和新参加工作大学生的住房需求.把360000用科学记数法表示应是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】科学记数法的表示形式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的形式,其中 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为整数.确定 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值时,要看把原数变成 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时,小数点移动了多少位, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的绝对值与小数点移动的位数相同.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】此题考查科学记数法的表示方法,表示时关键要正确确定 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值以及 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值.

3.(4分)如图,由6个相同的小正方体组合成一个立体图形,它的俯视图为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape21

AShape22 BShape23

CShape24 DShape25

【分析】找到从上面看所得到的图形即可.

【解答】解:从上面看可得四个并排的正方形,如图所示:

Shape26

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】本题考查了三视图的知识,俯视图是从物体的上面看得到的视图.

4.(4分)下列运算正确的是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】直接利用同底数幂的乘除运算法则以及幂的乘方运算法则分别化简得出答案.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,不是同类项,无法合并,故此选项错误;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,故此选项错误;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,正确;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,故此选项错误;

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】此题主要考查了同底数幂的乘除运算以及幂的乘方运算,正确掌握相关运算法则是解题关键.

5.(4分)某学校九年级1班九名同学参加定点投篮测试,每人投篮六次,投中的次数统计如下:435525341,这组数据的中位数、众数分别为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A45 B54 C44 D55

【分析】根据众数及中位数的定义,结合所给数据即可作出判断.

【解答】解:将数据从小到大排列为:123344555

这组数据的中位数为4;众数为5

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】本题考查了众数、中位数的知识,解答本题的关键是掌握众数及中位数的定义.

6.(4分)如图,将一块三角板的直角顶点放在直尺的一边上,当 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的度数为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape27

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】根据平行线的性质,可以得到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的关系,从而可以得到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的度数,然后根据 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,即可得到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的度数.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape28

【点评】本题考查平行线的性质,解答本题的关键是明确题意,利用平行线的性质解答.

7.(4分)如图,某停车场入口的栏杆 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,从水平位置绕点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 旋转到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的位置,已知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长为4米.若栏杆的旋转角 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则栏杆 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 端升高的高度为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape29

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,根据锐角三角函数的定义即可求出答案.

【解答】解:过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

由题意可知: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape30

【点评】本题考查解直角三角形,解题的关键是熟练运用锐角三角函数的定义,本题属于基础题型.

8.(4分)已知关于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的一元二次方程 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 有实数根,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的取值范围是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】根据二次项系数非零及根的判别式△ <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,即可得出关于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的一元一次不等式组,解之即可得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的取值范围.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 关于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的一元二次方程 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 有实数根,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

解得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】本题考查了根的判别式以及一元二次方程的定义,根据二次项系数非零及根的判别式△ <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,找出关于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的一元一次不等式组是解题的关键.

9.(4分)如图,在菱形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,菱形的一个顶点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在反比例函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的图象上,则反比例函数的解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape31

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】根据菱形的性质和平面直角坐标系的特点可以求得点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标,从而可以求得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值,进而求得反比例函数的解析式.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在菱形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,菱形边长为2

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 顶点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在反比例函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的图象上,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】本题考查待定系数法求反比例函数解析式、菱形的性质,解答本题的关键是明确题意,求出点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标.

10.(4分)如图,抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,交过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 且平行于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴的直线于另一点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,交 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 两点(点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 右边),对称轴为直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .若点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 关于直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的对称点恰好落在线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,下列结论中错误的是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape32

A.点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> B <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

C <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> D <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】由抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,可得点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标,然后由抛物线的对称性可得点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标,由点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 关于直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的对称点恰好落在线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,可知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,再结合平行线的性质可判断 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,从而可知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ;过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,由勾股定理可得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长,则点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 坐标可得,然后由对称性可得点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值可计算;由勾股定理可得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长,由双根式可得抛物线的解析式,根据以上计算或推理,对各个选项作出分析即可.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 对称轴为直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 无误;

如图,过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape33

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 关于直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的对称点恰好落在线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中,由勾股定理得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 对称轴为直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 无误;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 代入得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 无误;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 错误.

综上,错误的只有 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故选: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】本题考查了二次函数的性质、等腰三角形的判定与性质及勾股定理,熟练掌握二次函数的相关性质并数形结合是解题的关键.

二、填空题(本题10小题,每题3分,共30分)

11.(3分)把多项式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 分解因式,结果是  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  

【分析】首先提公因式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,再利用平方差进行二次分解即可.

【解答】解:原式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】此题主要考查了提公因式法与公式法分解因式,要求灵活使用各种方法对多项式进行因式分解,一般来说,如果可以先提取公因式的要先提取公因式,再考虑运用公式法分解.

12.(3分)若 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的和为单项式,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  8 

【分析】直接利用合并同类项法则进而得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值,即可得出答案.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的和为单项式,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是同类项,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为:8

【点评】此题主要考查了单项式,正确得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值是解题关键.

13.(3分)不等式组 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的解集为  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  

【分析】首先分别计算出两个不等式的解集,再确定不等式组的解集即可.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

不等式组的解集为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】此题主要考查了一元一次不等式组的解法,关键是掌握解集的规律:同大取大;同小取小;大小小大中间找;大大小小找不到.

14.(3分)如图,在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长度为  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  

Shape34

【分析】首先证明 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,然后再由条件 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 可得答案.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】此题主要考查了含 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 角的直角三角形的性质,关键是掌握在直角三角形中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 角所对的直角边等于斜边的一半.

15.(3分)如图,正比例函数的图象与一次函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的图象相交于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴的距离是2,则这个正比例函数的解析式是  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  

Shape35

【分析】根据图象和题意,可以得到点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的纵坐标,然后代入一次函数解析式,即可得到点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标,然后代入正比例函数解析式,即可得到这个正比例函数的解析式.

【解答】解: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴的距离为2

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的纵坐标为2

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在一次函数 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

设正比例函数解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 正比例函数解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】本题考查两条直线相交或平行问题、一次函数的性质、正比例函数的性质,解答本题的关键是明确题意,利用数形结合的思想解答.

16.(3分)如图,对折矩形纸片 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,使 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 重合得到折痕 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,将纸片展平,再一次折叠,使点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 落到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 处,并使折痕经过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,已知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长度为  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  

Shape36

【分析】直接利用翻折变换的性质以及直角三角形的性质得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,再利用平行线的性质得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,进而得出答案.

【解答】解:如图所示:

由题意可得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,故 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 四边形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是矩形,对折矩形纸片 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,使 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 重合得到折痕 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape37

【点评】此题主要考查了翻折变换的性质以及矩形的性质,正确得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是解题关键.

17.(3分)如图,是一个运算程序的示意图,若开始输入 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的值为625,则第2020次输出的结果为 1 

Shape38

【分析】依次求出每次输出的结果,根据结果得出规律,即可得出答案.

【解答】解:当 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

依此类推,以51循环,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,能够整除,

所以输出的结果是1

故答案为:1

【点评】本题考查了求代数式的值,能根据求出的结果得出规律是解此题的关键.

18.(3分)有一人患了流感,经过两轮传染后,共有121人患了流感,每轮传染中平均每人传染了 10 个人.

【分析】设每轮传染中平均每人传染了 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 人.开始有一人患了流感,第一轮的传染源就是这个人,他传染了 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 人,则第一轮后共有 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 人患了流感;第二轮传染中,这些人中的每个人又传染了 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 人,则第二轮后共有 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 人患了流感,而此时患流感人数为121,根据这个等量关系列出方程.

【解答】解:设每轮传染中平均每人传染了 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 人.

依题意,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

解方程,得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> (舍去).

答:每轮传染中平均每人传染了10人.

【点评】共有121人患了流感,是指患流感的人和被传染流感的人的总和,和细胞分裂问题有区别.

19.(3分)如图图形都是由同样大小的菱形按照一定规律所组成的,其中第个图形中一共有3个菱形,第个图形中一共有7个菱形,第个图形中一共有13个菱形, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,按此规律排列下去,第个图形中菱形的个数为 57 

Shape39

【分析】根据图形的变化规律即可得第个图形中菱形的个数.

【解答】解:第个图形中一共有3个菱形,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

个图形中一共有7个菱形,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

个图形中一共有13个菱形,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

按此规律排列下去,

所以第个图形中菱形的个数为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为:57

【点评】本题考查了规律型 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 图形的变化类,解决本题的关键是观察图形的变化寻找规律.

20.(3分)如图,在 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的中点,以点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为圆心作圆心角为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的扇形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 恰在弧 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,则图中阴影部分的面积为  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  

Shape40

【分析】连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,作 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,证明 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,求得扇形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的面积,则阴影部分的面积即可求得.

【解答】解:连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,作 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的中点,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,四边形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是正方形, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

则扇形 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的面积是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的中点,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 平分 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

则阴影部分的面积是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape41

【点评】本题考查了三角形的全等的判定与扇形的面积的计算的综合题,正确证明 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,得到 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是关键.

三、解答题(本题6小题,共80分)

21.(12分)(1)计算 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

2)先化简,再求值: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,其中 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【分析】1)直接利用零指数幂的性质以及特殊角的三角函数值、绝对值的性质分别化简得出答案;

2)直接将括号里面通分运算进而利用分式的混合运算法则计算得出答案.

【解答】解:(1)原式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>


2)原式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时,原式 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】此题主要考查了实数运算以及分式的混合运算,正确掌握相关运算法则是解题关键.

22.(12分)规定:在平面内,如果一个图形绕一个定点旋转一定的角度 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 后能与自身重合,那么就称这个图形是旋转对称图形,转动的这个角度 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 称为这个图形的一个旋转角.例如:正方形绕着两条对角线的交点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 旋转 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 后,能与自身重合(如图 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,所以正方形是旋转对称图形,且有两个旋转角.

根据以上规定,回答问题:

1)下列图形是旋转对称图形,但不是中心对称图形的是  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .矩形

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .正五边形

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .菱形

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> .正六边形

2)下列图形中,是旋转对称图形,且有一个旋转角是60度的有:  (填序号);Shape42

3)下列三个命题:中心对称图形是旋转对称图形;等腰三角形是旋转对称图形;圆是旋转对称图形.

其中真命题的个数有  个;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 0

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 1

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 2

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 3

4)如图2的旋转对称图形由等腰直角三角形和圆构成,旋转角有 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,将图形补充完整.

Shape43

【分析】1)根据旋转图形,中心对称图形的定义判断即可.

2)旋转对称图形,且有一个旋转角是60度判断即可.

3)根据旋转图形的定义判断即可.

4)根据要求画出图形即可.

【解答】解:(1)是旋转图形,不是中心对称图形是正五边形,

故选 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

2)是旋转对称图形,且有一个旋转角是60度的有(1)(3)(5).

故答案为(1)(3)(5).

3)命题中①③正确,

故选 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

4)图形如图所示:

Shape44

【点评】本题考查旋转对称图形,中心对称图形等知识,解题的关键是理解题意,灵活运用所学知识解决问题.

23.(14分)新学期,某校开设了“防疫宣传”“心理疏导”等课程.为了解学生对新开设课程的掌握情况,从八年级学生中随机抽取了部分学生进行了一次综合测试.测试结果分为四个等级: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为优秀, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为良好, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为及格, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级为不及格.将测试结果绘制了如图两幅不完整的统计图.根据统计图中的信息解答下列问题:

Shape45

1)本次抽样测试的学生人数是 40 名;

2)扇形统计图中表示 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级的扇形圆心角 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的度数是  ,并把条形统计图补充完整;

3)该校八年级共有学生500名,如果全部参加这次测试,估计优秀的人数为  

4)某班有4名优秀的同学(分别记为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,其中 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为小明),班主任要从中随机选择两名同学进行经验分享.利用列表法或画树状图法,求小明被选中的概率.

【分析】1)由题意可得本次抽样测试的学生人数是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> (人 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

2)首先可求得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级人数的百分比,继而求得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的度数,然后补出条形统计图;

3)根据 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级人数的百分比,列出算式即可求得优秀的人数;

4)首先根据题意画出树状图,然后由树状图求得所有等可能的结果与选中小明的情况,再利用概率公式即可求得答案.

【解答】解:(1)本次抽样测试的学生人数是: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> (人 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

2 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级的百分比为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 级人数为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> (人 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

如图所示:

3 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> (人 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故估计优秀的人数为 75人;

4)画树状图得:

Shape46

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 共有12种等可能的结果,选中小明的有6种情况,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 选中小明的概率为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

故答案为:40 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 75人.

Shape47

【点评】此题考查了列表法或树状图法求概率以及条形统计图与扇形统计图.用到的知识点为:概率 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 所求情况数与总情况数之比.

24.(14分)随着人们“节能环保,绿色出行”意识的增强,越来越多的人喜欢骑自行车出行,也给自行车商家带来商机.某自行车行经营的 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型自行车去年销售总额为8万元.今年该型自行车每辆售价预计比去年降低200元.若该型车的销售数量与去年相同,那么今年的销售总额将比去年减少 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,求:

1 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型自行车去年每辆售价多少元?

2)该车行今年计划新进一批 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车和新款 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车共60辆,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车的进货数量不超过 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车数量的两倍.已知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车和 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车的进货价格分别为1500元和1800元,计划 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车销售价格为2400元,应如何组织进货才能使这批自行车销售获利最多?

【分析】1)设去年 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车每辆售价 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 元,则今年售价每辆为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 元,由卖出的数量相同建立方程求出其解即可;

2)设今年新进 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 辆,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 辆,获利 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 元,由条件表示出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 之间的关系式,由 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的取值范围就可以求出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的最大值.

【解答】解:(1)设去年 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车每辆售价 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 元,则今年售价每辆为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 元,由题意,得

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

解得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

经检验, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是原方程的根.

答:去年 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车每辆售价为2000元;

2)设今年新进 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 辆,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 辆,获利 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 元,由题意,得

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车的进货数量不超过 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车数量的两倍,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的增大而减小.

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车的数量为: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 辆.

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 当新进 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车20辆, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 型车40辆时,这批车获利最大.

【点评】本题考查了列分式方程解实际问题的运用,分式方程的解法的运用,一次函数的解析式的运用,解答时由销售问题的数量关系求出一次函数的解析式是关键.

25.(12分)古希腊数学家毕达哥拉斯认为:“一切平面图形中最美的是圆”.请研究如下美丽的圆.如图,线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的直径,延长 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 至点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,使 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的中点, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上一动点(不与点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 重合),连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

1)求证: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的切线;

2)小明在研究的过程中发现 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是一个确定的值.回答这个确定的值是多少?并对小明发现的结论加以证明.

Shape48

【分析】1)连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,由已知可知 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 垂直平分 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,再由圆的半径相等,可得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,即 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是等边三角形,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,再由等腰三角形的性质及三角形的外角性质可得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,从而可得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,按照切线的判定定理可得结论;

2)连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,先由已知条件得 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,再利用两组边成比例,夹角相等来证明 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,按照相似三角形的性质得出比例式,则可得答案.

【解答】解:(1)连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape49

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的中点, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 垂直平分 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 中, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是等边三角形,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,且 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的外角,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的切线;

2)答:这个确定的值是 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,如图:

Shape50

由已知可得: <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

【点评】本题考查了切线的判定与性质及相似三角形的判定与性质,熟练掌握相关性质及定理是解题的关键.

26.(16分)已知抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 和点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,交 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

1)求抛物线的解析式和顶点坐标;

2)如图(1),点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 是抛物线上位于直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上方的动点,过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 分别作 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴、 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴的平行线,交直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 于点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,当 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 取最大值时,求点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标;

3)如图(2),点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为抛物线对称轴 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上一点,点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 为抛物线上一点,当直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 垂直平分 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的边 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时,求点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标.

Shape51

【分析】1)将点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 坐标代入抛物线解析式中,解方程组即可得出结论;

2)先求出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,进而得出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,进而判断出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,即可得出当 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长度最大时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 取最大值,设出点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 坐标,表示出点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 坐标,建立 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,即可得出结论;

3)先判断出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴,进而求出点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的纵坐标,即可建立方程求解得出结论.

【解答】解:(1 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 抛物线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 经过点 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 抛物线的解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 抛物线的解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,顶点坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>


2)由(1)知,抛物线的解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 平行于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 平行于 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的长度最大时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 取最大值,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,则 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 最大,此时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>


3)如图(2),设直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 与抛物线的对称轴 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的交点为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,连接 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 在线段 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的垂直平分线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 上,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴,

由(2)知,直线 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的解析式为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 时, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的纵坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,解得, <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 的坐标为 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a>

Shape52

【点评】此题是二次函数综合题,主要考查了待定系数法,解一元二次方程,(2)中判断出 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> ,(3)中 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/107/" title="西南" class="c1" target="_blank">西南</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1146/" title="黔西" class="c1" target="_blank">黔西</a> 轴是解本题的关键.