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【330281】2020年贵州省贵阳市中考数学试卷

时间:2025-02-09 10:44:01 作者: 字数:25258字

2020年贵州省贵阳市中考数学试卷

一、选择题:以下每小题均有ABCD四个选项,其中只有一个选项正确,请用2B铅笔在答题卡相应位置作答,每小题3分,共30分.

1.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的结果是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> C1 D6

2.(3分)下列4个袋子中,装有除颜色外完全相同的10个小球,任意摸出一个球,摸到红球可能性最大的是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

AShape1 BShape2

CShape3 DShape4

3.(3分)2020年为阻击新冠疫情,某社区要了解每一栋楼的居民年龄情况,以便有针对性进行防疫,一志愿者得到某栋楼60岁以上人的年龄(单位:岁)数据如下:626375796885826970.获得这组数据的方法是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

A.直接观察 B.实验 C.调查 D.测量

4.(3分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,如果 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,那么 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape5

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

5.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 时,下列分式没有意义的是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

6.(3分)下列四幅图中,能表示两棵树在同一时刻太阳光下的影子的图是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

AShape6 BShape7

CShape8 DShape9

7.(3分)菱形的两条对角线长分别是68,则此菱形的周长是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

A5 B20 C24 D32

8.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,下列式子不一定成立的是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

9.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,利用尺规在 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 上分别截取 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ;分别以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为圆心、以大于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的长为半径作弧,两弧在 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 内交于点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ;作射线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> .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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 上一动点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的最小值为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape10

A.无法确定 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> C1 D2

10.(3分)已知二次函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象经过 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 两点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的方程 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 有两个根,其中一个根是3.则关于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的方程 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 有两个整数根,这两个整数根是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 0 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 2 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 3 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 4

二、填空题:每小题4分,共20分.

11.(4分)化简 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的结果是  

12.(4分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 图象上任意一点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 轴的垂线,垂足为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,则四边形 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积为  

Shape11

13.(4分)在“抛掷正六面体”的试验中,正六面体的六个面分别标有数字“1”“2”“3”“4”“5”“6”,在试验次数很大时,数字“6”朝上的频率的变化趋势接近的值是  

14.(4分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的内接正三角形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是圆心,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 分别在边 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 上,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的度数是  度.

Shape12

15.(4分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 在边 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 垂直于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的延长线于点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,则边 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的长为  

Shape13

三、解答题:本大题10小题,共100分.

16.(8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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的正方形网格中,每个小格的顶点叫做格点,以格点为顶点分别按下列要求画三角形.

1)在图中,画一个直角三角形,使它的三边长都是有理数;

2)在图中,画一个直角三角形,使它的一边长是有理数,另外两边长是无理数;

3)在图中,画一个直角三角形,使它的三边长都是无理数.

Shape14

17.(10分)20202月,贵州省积极响应国家“停课不停学”的号召,推出了“空中黔课”.为了解某中学初三学生每天听空中黔课的时间,随机调查了该校部分初三学生.根据调查结果,绘制出了如图统计图表(不完整),请根据相关信息,解答下列问题:

部分初三学生每天听空中黔课时间的人数统计表

时间 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

1.5

2

2.5

3

3.5

4

人数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2

6

6

10

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

4

1)本次共调查的学生人数为  ,在表格中, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>   

2)统计的这组数据中,每天听空中黔课时间的中位数是  ,众数是  

3)请就疫情期间如何学习的问题写出一条你的看法.

Shape15

18.(10分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是矩形, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 边上一点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的延长线上,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

1)求证: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是平行四边形;

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,求四边形 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积.

Shape16

19.(10分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象与反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象相交,其中一个交点的横坐标是2

1)求反比例函数的表达式;

2)将一次函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象向下平移2个单位,求平移后的图象与反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 图象的交点坐标;

3)直接写出一个一次函数,使其过点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,且与反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象没有公共点.

Shape17

20.(10分)“2020第二届贵阳市应急科普知识大赛”的比赛中有一个抽奖活动,规则是:准备3张大小一样,背面完全相同的卡片,3张卡片的正面所写内容分别是《消防知识手册》《辞海》《辞海》,将它们背面朝上洗匀后任意抽出一张,抽到卡片后可以免费领取卡片上相应的书籍.

1)在上面的活动中,如果从中随机抽出一张卡片,记下内容后不放回,再随机抽出一张卡片,请用列表或画树状图的方法,求恰好抽到2张卡片都是《辞海》的概率;

2)再添加几张和原来一样的《消防知识手册》卡片,将所有卡片背面朝上洗匀后,任意抽出一张,使得抽到《消防知识手册》卡片的概率为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,那么应添加多少张《消防知识手册》卡片?请说明理由.

21.(8分)脱贫攻坚工作让老百姓过上了幸福的生活.如图是政府给贫困户新建的房屋,如图是房屋的侧面示意图,它是一个轴对称图形,对称轴是房屋的高 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 所在的直线,为了测量房屋的高度,在地面上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点测得屋顶 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的仰角为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,此时地面上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点、屋檐上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点、屋顶上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点三点恰好共线,继续向房屋方向走 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 到达点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 时,又测得屋檐 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点的仰角为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,房屋的顶层横梁 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 在同一水平线上).(参考数据: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

1)求屋顶到横梁的距离 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2)求房屋的高 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (结果精确到 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape18

22.(10分)第33个国际禁毒日到来之际,贵阳市策划了以“健康人生 绿色无毒”为主题的禁毒宣传月活动,某班开展了此项活动的知识竞赛.学习委员为班级购买奖品后与生活委员对话如下:

Shape19

1)请用方程的知识帮助学习委员计算一下,为什么说学习委员搞错了;

2)学习委员连忙拿出发票,发现的确错了,因为他还买了一本笔记本,但笔记本的单价已模糊不清,只能辨认出单价是小于10元的整数,那么笔记本的单价可能是多少元?

23.(10分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的直径,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 内接于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,对角线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的切线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的延长线于点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,切点为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的值.

Shape20

24.(12分)2020年体育中考,增设了考生进入考点需进行体温检测的要求.防疫部门为了解学生错峰进入考点进行体温检测的情况,调查了一所学校某天上午考生进入考点的累计人数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 与时间 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (分钟)的变化情况,数据如下表:(表中 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

时间 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (分钟)

0

1

2

3

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5

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7

8

9

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

人数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

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450

560

650

720

770

800

810

810

1)根据这15分钟内考生进入考点的累计人数与时间的变化规律,利用初中所学函数知识求出 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 之间的函数关系式;

2)如果考生一进考点就开始测量体温,体温检测点有2个,每个检测点每分钟检测20人,考生排队测量体温,求排队人数最多时有多少人?全部考生都完成体温检测需要多少时间?

3)在(2)的条件下,如果要在12分钟内让全部考生完成体温检测,从一开始就应该至少增加几个检测点?

25.(12分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是正方形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为对角线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的中点.

1)问题解决:如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,分别取 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的数量关系是  ,位置关系是  

2)问题探究: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是将图中的 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 按顺时针方向旋转 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 得到的三角形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的中点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> .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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的形状,并证明你的结论;

3)拓展延伸: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是将图中的 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 按逆时针方向旋转 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 得到的三角形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的中点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> .若正方形 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的边长为1,求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积.

Shape21


2020年贵州省贵阳市中考数学试卷

参考答案与试题解析

一、选择题:以下每小题均有ABCD四个选项,其中只有一个选项正确,请用2B铅笔在答题卡相应位置作答,每小题3分,共30分.

1.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的结果是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> C1 D6

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2.(3分)下列4个袋子中,装有除颜色外完全相同的10个小球,任意摸出一个球,摸到红球可能性最大的是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

AShape22 BShape23

CShape24 DShape25

【解答】解:在四个选项中, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 选项袋子中红球的个数最多,

所以从 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 选项袋子中任意摸出一个球,摸到红球可能性最大,

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

3.(3分)2020年为阻击新冠疫情,某社区要了解每一栋楼的居民年龄情况,以便有针对性进行防疫,一志愿者得到某栋楼60岁以上人的年龄(单位:岁)数据如下:626375796885826970.获得这组数据的方法是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

A.直接观察 B.实验 C.调查 D.测量

【解答】解:一志愿者得到某栋楼60岁以上人的年龄(单位:岁)数据如下:626375796885826970

获得这组数据的方法是:调查.

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

4.(3分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,如果 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,那么 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape26

A <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (对顶角相等),

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 互为邻补角,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

5.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 时,下列分式没有意义的是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 时,分式有意义不合题意;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,分式无意义符合题意;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 时,分式有意义不合题意;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 时,分式有意义不合题意;

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

6.(3分)下列四幅图中,能表示两棵树在同一时刻太阳光下的影子的图是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

AShape27 BShape28

CShape29 DShape30

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、两棵小树的影子的方向相反,不可能为同一时刻阳光下影子,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、两棵小树的影子的方向相反,不可能为同一时刻阳光下影子,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、在同一时刻阳光下,树高与影子成正比,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 选项正确.

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、图中树高与影子成反比,而在同一时刻阳光下,树高与影子成正比,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

7.(3分)菱形的两条对角线长分别是68,则此菱形的周长是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

A5 B20 C24 D32

【解答】解:如图所示:

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是菱形, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 此菱形的周长 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape31

8.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,下列式子不一定成立的是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、在不等式 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的两边同时减去1,不等号的方向不变,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,原变形正确,故此选项不符合题意;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、在不等式 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的两边同时乘以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,不等号方向改变,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,原变形正确,故此选项不符合题意;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、在不等式 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的两边同时乘以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,不等号的方向不变,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,不等式 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的两边同时加上1,不等号的方向不变,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,原变形正确,故此选项不符合题意;

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 、在不等式 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的两边同时乘以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,不等式不一定成立,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,或 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,或 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,原变形不正确,故此选项符合题意.

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

9.(3分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,利用尺规在 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 上分别截取 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ;分别以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为圆心、以大于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的长为半径作弧,两弧在 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 内交于点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ;作射线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> .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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 上一动点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的最小值为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape32

A.无法确定 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> C1 D2

【解答】解: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape33

由作图可知, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

根据垂线段最短可知, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的最小值为1

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

10.(3分)已知二次函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象经过 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 两点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的方程 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 有两个根,其中一个根是3.则关于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的方程 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 有两个整数根,这两个整数根是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>    <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 0 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 2 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 3 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 4

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 二次函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象经过 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 两点,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的两个根为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 1,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的对称轴是直线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的方程 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 有两个根,其中一个根是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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的另一个根为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象开口向上,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的方程 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 有两个整数根,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 这两个整数根是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 2

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

二、填空题:每小题4分,共20分.

11.(4分)化简 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的结果是  <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

12.(4分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 图象上任意一点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 轴的垂线,垂足为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,则四边形 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积为 3 

Shape34

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 轴的垂线,垂足为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

则四边形 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积为:3

故答案为:3

13.(4分)在“抛掷正六面体”的试验中,正六面体的六个面分别标有数字“1”“2”“3”“4”“5”“6”,在试验次数很大时,数字“6”朝上的频率的变化趋势接近的值是  <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  

【解答】解:在试验次数很大时,数字“6”朝上的频率的变化趋势接近的值是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

14.(4分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的内接正三角形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是圆心,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 分别在边 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 上,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的度数是 120 度.

Shape35

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的内接正三角形,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

故答案为:120

Shape36

15.(4分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 在边 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 垂直于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的延长线于点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,则边 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的长为  <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  

Shape37

【解答】解: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,使得 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是等腰三角形,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点作 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 由勾股定理可知: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape38

三、解答题:本大题10小题,共100分.

16.(8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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的正方形网格中,每个小格的顶点叫做格点,以格点为顶点分别按下列要求画三角形.

1)在图中,画一个直角三角形,使它的三边长都是有理数;

2)在图中,画一个直角三角形,使它的一边长是有理数,另外两边长是无理数;

3)在图中,画一个直角三角形,使它的三边长都是无理数.

Shape39

【解答】解:(1)如图中, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 即为所求.

2)如图中, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 即为所求.

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 即为所求.

Shape40

17.(10分)20202月,贵州省积极响应国家“停课不停学”的号召,推出了“空中黔课”.为了解某中学初三学生每天听空中黔课的时间,随机调查了该校部分初三学生.根据调查结果,绘制出了如图统计图表(不完整),请根据相关信息,解答下列问题:

部分初三学生每天听空中黔课时间的人数统计表

时间 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

1.5

2

2.5

3

3.5

4

人数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2

6

6

10

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

4

1)本次共调查的学生人数为 50 ,在表格中, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>   

2)统计的这组数据中,每天听空中黔课时间的中位数是  ,众数是  

3)请就疫情期间如何学习的问题写出一条你的看法.

Shape41

【解答】解:(1)本次共调查的学生人数为: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

故答案为:5022


2)由条形统计图得,21.56262.5103223.544

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 25个数和第26个数都是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 中位数是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 出现了22次,出现的次数最多,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 众数是 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>


3)就疫情期间如何学习的问题,我的看法是:认真听课,独立思考(答案不唯一).

18.(10分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是矩形, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 边上一点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的延长线上,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

1)求证: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是平行四边形;

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,求四边形 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积.

Shape42

【解答】1)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是矩形,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是平行四边形;

2)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是矩形,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape43

19.(10分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象与反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象相交,其中一个交点的横坐标是2

1)求反比例函数的表达式;

2)将一次函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象向下平移2个单位,求平移后的图象与反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 图象的交点坐标;

3)直接写出一个一次函数,使其过点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,且与反比例函数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象没有公共点.

Shape44

【解答】解:(1)将 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 代入 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,故其中交点的坐标为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 代入反比例函数表达式并解得: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

故反比例函数表达式为: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>


2)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的图象向下平移2个单位得到 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

联立①②并解得: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

故交点坐标为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>


3)设一次函数的表达式为: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

联立①③并整理得: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 两个函数没有公共点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

故可以取 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (答案不唯一),

故一次函数表达式为: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (答案不唯一).

20.(10分)“2020第二届贵阳市应急科普知识大赛”的比赛中有一个抽奖活动,规则是:准备3张大小一样,背面完全相同的卡片,3张卡片的正面所写内容分别是《消防知识手册》《辞海》《辞海》,将它们背面朝上洗匀后任意抽出一张,抽到卡片后可以免费领取卡片上相应的书籍.

1)在上面的活动中,如果从中随机抽出一张卡片,记下内容后不放回,再随机抽出一张卡片,请用列表或画树状图的方法,求恰好抽到2张卡片都是《辞海》的概率;

2)再添加几张和原来一样的《消防知识手册》卡片,将所有卡片背面朝上洗匀后,任意抽出一张,使得抽到《消防知识手册》卡片的概率为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,那么应添加多少张《消防知识手册》卡片?请说明理由.

【解答】解:(1)把《消防知识手册》《辞海》《辞海》分别即为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

画树状图如图:

Shape45

共有6个等可能的结果,恰好抽到2张卡片都是《辞海》的结果有2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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 恰好抽到2张卡片都是《辞海》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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2)设应添加 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 张《消防知识手册》卡片,

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是原方程的解;

答:应添加4张《消防知识手册》卡片.

21.(8分)脱贫攻坚工作让老百姓过上了幸福的生活.如图是政府给贫困户新建的房屋,如图是房屋的侧面示意图,它是一个轴对称图形,对称轴是房屋的高 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 所在的直线,为了测量房屋的高度,在地面上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点测得屋顶 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的仰角为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,此时地面上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点、屋檐上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点、屋顶上 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点三点恰好共线,继续向房屋方向走 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 到达点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 时,又测得屋檐 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 点的仰角为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,房屋的顶层横梁 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 在同一水平线上).(参考数据: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

1)求屋顶到横梁的距离 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2)求房屋的高 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (结果精确到 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape46

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 房屋的侧面示意图,它是一个轴对称图形,对称轴是房屋的高 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 所在的直线, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (米 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

答:屋顶到横梁的距离 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 4.2米;

2)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (米 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

答:房屋的高 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 14米.

Shape47

22.(10分)第33个国际禁毒日到来之际,贵阳市策划了以“健康人生 绿色无毒”为主题的禁毒宣传月活动,某班开展了此项活动的知识竞赛.学习委员为班级购买奖品后与生活委员对话如下:

Shape48

1)请用方程的知识帮助学习委员计算一下,为什么说学习委员搞错了;

2)学习委员连忙拿出发票,发现的确错了,因为他还买了一本笔记本,但笔记本的单价已模糊不清,只能辨认出单价是小于10元的整数,那么笔记本的单价可能是多少元?

【解答】解:(1)设单价为6元的钢笔买了 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 支,则单价为10元的钢笔买了 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 支,根据题意,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

因为钢笔的数量不可能是小数,所以学习委员搞错了;


2)设笔记本的单价为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 元,根据题意,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

整理,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

因为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的增大而增大,所以 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 取整数,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 21

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

所以笔记本的单价可能是2元或6元.

23.(10分)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的直径,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 内接于 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,对角线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的切线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的延长线于点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,切点为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的值.

Shape49

【解答】解:(1)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的切线,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的直径,

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape50

24.(12分)2020年体育中考,增设了考生进入考点需进行体温检测的要求.防疫部门为了解学生错峰进入考点进行体温检测的情况,调查了一所学校某天上午考生进入考点的累计人数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 与时间 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (分钟)的变化情况,数据如下表:(表中 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

时间 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> (分钟)

0

1

2

3

4

5

6

7

8

9

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

人数 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

0

170

320

450

560

650

720

770

800

810

810

1)根据这15分钟内考生进入考点的累计人数与时间的变化规律,利用初中所学函数知识求出 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 之间的函数关系式;

2)如果考生一进考点就开始测量体温,体温检测点有2个,每个检测点每分钟检测20人,考生排队测量体温,求排队人数最多时有多少人?全部考生都完成体温检测需要多少时间?

3)在(2)的条件下,如果要在12分钟内让全部考生完成体温检测,从一开始就应该至少增加几个检测点?

【解答】解:(1)由表格中数据的变化趋势可知,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的二次函数,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 二次函数的关系式可设为: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 二次函数关系式为: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 之间的函数关系式为: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

2)设第 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 分钟时的排队人数为 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 人,

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的最大值 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 排队人数最多时是490人,

要全部考生都完成体温检测,根据题意得: <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

答:排队人数最多时有490人,全部考生都完成体温检测需要20.25分钟;

3)设从一开始就应该增加 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 个检测点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是整数,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的最小整数是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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 一开始就应该至少增加2个检测点.

25.(12分)如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是正方形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为对角线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的中点.

1)问题解决:如图,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> ,分别取 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的数量关系是  <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  ,位置关系是  

2)问题探究: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是将图中的 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 按顺时针方向旋转 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 得到的三角形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的中点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> .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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的形状,并证明你的结论;

3)拓展延伸: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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是将图中的 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 按逆时针方向旋转 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 得到的三角形,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的中点,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> .若正方形 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的边长为1,求 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的面积.

Shape51

【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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为对角线 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的形状是等腰直角三角形.理由如下:

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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 并延长交 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape52

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 按顺时针方向旋转 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是等腰直角三角形, <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为等腰直角三角形.

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 也为等腰直角三角形.

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 的形状是等腰直角三角形;

3)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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 边于点 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

Shape53

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是对角线,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

由旋转得,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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 是矩形,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为等腰直角三角形.

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a> 为等腰直角三角形,

 <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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</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/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>  <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>

 <a href="/tags/54/" title="试卷" class="c1" target="_blank">试卷</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/551/" title="贵州" class="c1" target="_blank">贵州</a> <a href="/tags/1022/" title="贵州省" class="c1" target="_blank">贵州省</a> <a href="/tags/1101/" title="贵阳" class="c1" target="_blank">贵阳</a>