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【328015】四川省眉山市2021年中考数学真题

时间:2025-01-20 20:59:58 作者: 字数:19354字
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四川省眉山市2021年中考数学真题

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得分




一、选择题

1.6的相反数为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
A
-6
B
6
C
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
D
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

2.2020723日,中国首次火星探测任务“天问一号”探测器在海南文昌航天发射场由长征五号遥四运载火箭发射升空,每天基本飞行200万千米,并于2021515日成功着陆预选区,火星上首次留下了中国的足迹.将200万用科学记数法表示为( )
A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
D
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

3.下列计算中,正确的是( )
A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
D
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

4.如图,将直角三角板放置在矩形纸片上,若 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的度数为( )
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
A
42°
B
48°
C
52°
D
60°

5.正八边形中,每个内角与每个外角的度数之比为( )
A
13
B
12
C
21
D
31

6.化简 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的结果是( )
A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
D
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

7.全民反诈,刻不容缓!陈科同学参加学校举行的“防诈骗”主题演讲比赛,五位评委给出的分数分别为9080869094,则这组数据的中位数和众数分别是( )
A
8090
B
9090
C
8690
D
9094

8.我国某型号运载火箭的整流罩的三视图如图所示,根据图中数据(单位:米)计算该整流罩的侧面积(单位:平方米)是( )
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
D
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

9.已知一元二次方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的两根为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值为( )
A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C
2
D
5

10.如图,在以 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为直径的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为圆上的一点, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,弦 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,弦 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,交 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .若点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的中点,则 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的度数为( )
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

A
18°
B
21°
C
22.5°
D
30°

11.在平面直角坐标系中,抛物线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则该抛物线关于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 成中心对称的抛物线的表达式为( )
A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
D
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

12.如图,在矩形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,对角线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 在线段 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上从点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 至点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 运动,连接 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,以 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为边作等边三角形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 分别位于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 两侧,下列结论:① <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;② <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;③ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;④点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 运动的路程是 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,其中正确结论的序号为( )
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
A
.①④
B
.①②③
C
.②③④
D
.①②③④

评卷人

得分




二、填空题

13.分解因式: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ______

14.一次函数 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值随 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 值的增大而减少,则常数 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的取值范围是______

15.如图, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 平分 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,分别以点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为圆心,大于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长为半径作弧,两弧相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,作直线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,交 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长为______
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

16.若关于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的不等式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 只有3个正整数解,则 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的取值范围是______

17.观察下列等式: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
……
根据以上规律,计算 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ______

18.如图,在菱形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,对角线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 在线段 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上,且 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为线段 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上的一个动点,则 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的最小值是______
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

评卷人

得分




三、解答题

19.计算: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

20.解方程组 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

21.吸食毒品极易上瘾,不但对人的健康危害极大,而且严重影响家庭和社会的稳定.为了解同学们对禁毒知识的掌握情况,从我市某校1000名学生中随机抽取部分学生进行问卷调查,调查评价结果分为:“了解较少”,“基本了解”,“了解较多”,“非常了解”四类,并根据调查结果绘制出如图所示的两幅不完整的统计图.
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
请根据统计图回答下列问题:
1)本次抽取调查的学生共有 人,其中“了解较多”的占 %
2)请补全条形统计图:
3)估计此校“非常了解”和“了解较多”的学生共有 人;
4)“了解较少”的四名学生中,有3名学生 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是初一学生,1名学生 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为初二学生,为了提高学生对禁毒知识的认识,对这4人进行了培训,然后从中随机抽取2人对禁毒知识的掌握情况进行检测.请用画树状图或列表的方法,求恰好抽到初一、初二学生各1名的概率.

22.眉山水街”走红网络,成为全国各地不少游客新的打卡地!游客小何用无人机对该地一标志建筑物进行拍摄和观测,如图,无人机从 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 处测得该建筑物顶端 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的俯角为24°,继续向该建筑物方向水平飞行20米到达 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 处,测得顶端 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的俯角为45°,已知无人机的飞行高度为60米,则这栋建筑物的高度是多少米?(精确到0.1米,参考数据: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

23.为进一步落实“德、智、体、美、劳”五育并举工作,某中学以体育为突破口,准备从体育用品商场一次性购买若千个足球和篮球,用于学校球类比赛活动.每个足球的价格都相同,每个篮球的价格也相同.已知篮球的单价比足球单价的2倍少30元,用1200元购买足球的数量是用900元购买篮球数量的2倍.
1)足球和篮球的单价各是多少元?
2)根据学校实际情况,需一次性购买足球和篮球共200个,但要求足球和篮球的总费用不超过15500元,学校最多可以购买多少个篮球?

24.如图,直线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,与 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .直线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,且与 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的外接圆 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相切,与双曲线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 在第二象限内的图象交于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 两点.
1)求点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坐标和 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的半径;
2)求直线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 所对应的函数表达式;
3)求 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的面积.
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

25.如图,在等腰直角三角形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,边长为2的正方形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的对角线交点与点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 重合,连接 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
1)求证: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)当点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 内部,且 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,设 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,求 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长;
3)将正方形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 绕点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 旋转一周,当点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 三点在同一直线上时,请直接写出 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长.
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

26.如图,在平面直角坐标系中,已知抛物线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 经过点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
1)求这条抛物线所对应的函数表达式;
2)点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为该抛物线上一点(不与点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 重合),直线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的面积分成21两部分,求点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坐标;
3)点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 从点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 出发,以每秒1个单位的速度沿 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴移动,运动时间为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 秒,当 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,求 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值.
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

参考答案

1.A

【解析】
根据相反数的定义进行求解.
6
的相反数为:﹣6.故选A.

2.B

【解析】
先将200万转化为2000000,再将它写成 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ),利用科学记数法进行表示即可.
解:200=2000000= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:B

3.C

【解析】
逐一分析各选项中的计算结果,利用计算公式进行计算即可得到正确选项.
解:A选项中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
选项中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;
C
选项正确;
D
选项中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;
故选:C

4.A

【解析】
先通过作辅助线,将∠1转化到∠BAC,再利用直角三角形两锐角互余即可求出∠2
解:如图,延长该直角三角形一边,与该矩形纸片一边的交点记为点A
由矩形对边平行,可得∠1=∠BAC
因为BC⊥AB
∴∠BAC+∠2=90°

∴∠1+∠2=90°

因为∠1=48°
∴∠2=42°

故选:A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

5.D

【解析】
根据正八边形的外角和等于360°,求出每个外角的度数,再求出每个内角的度数,进而即可求解.
解:正八边形中,每个外角=360°÷8=45°,每个内角=180°-45°=135°
每个内角与每个外角的度数之比=135°45°=31
故选D

6.B

【解析】
小括号先通分合并,再将除法变乘法并因式分解即可约分化简.
解:原式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案是:B

7.B

【解析】
先将该组数据按照从小到大排列,位于最中间的数和出现次数最多的数即分别为中位数和众数.
解:将这组数据按照从小到大排列:80,86,90,90,94
位于最中间的数是90,所以中位数是90
这组数据中,90出现了两次,出现次数最多,因此,众数是90
故选:B

8.C

【解析】
从三视图分析出运载火箭由上半部分的圆锥和下半部分的圆柱组成,分别求出圆柱和圆锥的侧面积,再求和即可.
由图可知,运载火箭的上半部分为圆锥,底面圆的半径r <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,高1.6.下半部分为圆柱,底面的半径r=1.2,高4
柱的积为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
圆锥积为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
整流罩的 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C

9.A

【解析】
根据一元二次方程根的定义,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,结合根与系数的关系,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> + <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> =3,进而即可求解.
解:∵一元二次方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的两根为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> + <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> =3
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> = <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> -2( <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> + <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> )=-1-2×3=-7
故选A

10.C

【解析】
根据直径所对的圆周角是 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,可知 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,可知 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的度数,根据直角三角形斜边上的中线等于斜边的一半可知, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为等腰三角形,再根据 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 可求得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的度数.
解:∵ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的直径,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的中点,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
又∵ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:C

11.A

【解析】
先求出C点坐,再新抛物线上的点的坐标为x,y),求出它关于点C称的点的坐,代入到原抛物线解析式中去,即可得到新抛物线的解析式.
:x=0y=5
C0,5);
新抛物线上的点的坐标为x,y),
原抛物线与新抛物线关于点C成中心称,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
对应的原抛物线上点的坐标为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
代入原抛物线解析式可得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
新抛物线的解析式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
A

12.B

【解析】
连接OE并延DC于点H,先ADO三角形,得出2=DAF=60°,再根据DEF三角形,得出正确;DOE≌△COE,得到ED=EC,得出正确;ADF=3,看得出正确;根据DOE≌△COE,得出点EOH上运,可得正确.
解:
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
OE并延DC于点H
矩形ABCD
OA=OD=OC
∵∠DAC=60°
∴△ADO三角形,
∴∠2=DAF=60°
∵△DEF三角形,
∴∠1=60°=5
∴∠1=2
DFOE四点共
∴∠3=4正确;
∴∠5=6=60°
∴∠7=6=60°
OD=OCOE=OE
∴△DOE≌△COE
∴∠3=8
∴∠CDE=DCE
ED=EC正确;
∵∠ADO=FDE=60°
∴∠ADF=3
∴∠ADF=8,即ADF=ECF正确;
∵△DOE≌△COE
EDOC的角平分线上与CD的交点H,即点EOH上运
OH= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> BC
OH= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 错误
B

13. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
先利用提公因式法提出公因式xy,再利用平方差公式法进行变形即可.
解: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案为: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

14. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
由题意,先根据一次函数的性质得出关于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的不等式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再解不等式即可.
解: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 一次函数 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值随 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 值的增大而减少,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案是: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

15. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
先由等腰三角形性质求出CD以及 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再利用作方式确定MN垂直平分AC,得到CE=AE,最后利用勾股定理即可求解.
:  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 平分 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,且 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,(等腰三角形线合一
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
由分以点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为圆心,大于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 长为半径作弧,两弧相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,作直线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,可知,MN垂直平分AC
CE
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 长为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

16. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
首先解关于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的不等式,然后根据 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 只有3个正整数解,来确定关于 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的不等式组的取值范围,再进行求解即可.
解:解不等式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
由题意 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 只有3个正整数解,则分别为:123
故: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案是: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

17. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
根据题意,找到第n个等式的左边为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,等式右边为1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的和;利用结论得到原式=1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +…+1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ﹣2021,然后把 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 1﹣ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再行分数的加减运算即可.
解:由意可知, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +…+1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ﹣2021
2020+1﹣ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> + <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +…+ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ﹣2021
2020+1﹣ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ﹣2021
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

18. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
M点作MH垂直BCH点,与OB的交点P点,此 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 度最小MH,再算出MC度, 在直角三角形MPC中利用三角函数即可解得MH
M点作MH垂直BCH点,与OB的交点P点,此 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 度最小
菱形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
AB=BC=AC=10ABC三角形
∴∠PBC=30°ACB=60°
在直角PBH中,PBH=30°
PH= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 得到最小 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
AC=10AM=3,
MC=7
MPC=60°
MH=MCsin60°= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

19. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
依次计算“0次方”、 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 、负整数指数幂、化简 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 等,再进行合并同类项即可.
解:原式= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

20. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
方程组适当变形后,给②×3-①×2即可消去x,解关于y的一元一次方程,再将y值代入①式,即可解出y
解:由 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 可得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
②×3-①×2
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得y=1
y=1代入①式得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,解得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故该方程组的解为 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

21.15030;(2)见详解;(3780;(4 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)用“了解较少”的人数÷对应的百分比,即可得到抽取调查的总人数,用“了解较多”的人数÷抽取的总人数,即可得到百分比,
2)先求出“基本了解”的人数,再补全统计图,即可;
3)用1000ד非常了解”和“了解较多”人数之和所占百分比,即可求解;
4)画出树状图,展示所有等可能的结果,即可求解.
解:(14÷8=50(人),15÷50×100=30%,
故答案是:5030
250-24-4-15=7(人),
补全条形统计图如下:
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
31000× <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> =780(人),
故答案是:780
4)画树状图如下:
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
共有12种等可能结果,恰好抽到初一、初二学生各1名的结果数有6种,
恰好抽到初一、初二学生各1名的概率=6÷12= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

22. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中有公共直角边CE,根据等腰直角三角形以及角三角函数的角关系解出CE度,再用无人机的行高度减去CE即可.
解:C <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> AB的延长线于点C,作 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点F,如所示:
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

23.1)每个足球60元,每个篮球90元;(2)最多购进篮球116

【解析】
1)设一个足球的单价x元,已知球的价比足球价的2倍少30元,一个球的2x-30)元,根据1200购买足球的数量是用900购买篮球数量的2列方程求解即可;
2设买篮m个,则买足球(200-m)个,根据购买足球和球的总费用不超15500元建立不等式求出解即可.
解:(1每个足球x元,每个球(2x-30)元,
根据意得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得x=60
经检验x=60是方程的根且符合意,
2x-30=90

答:每个足球60元,每个90元.
2设设买篮m个,则买足球(200-m)个,
意得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
m正整数, 最多购进篮116个.

24.1A-80),B06),5;(2y= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> x+ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;(3 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)令y=0代入 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,令x=0代入 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即可得到AB的坐而得到的半径;
2AAGMN于点G,得AG=5,由AMG=OAB,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 而即可求解;
3 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,可得C的坐而即可求解.
解:(1)令y=0代入 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,解得:x=-8,即:A-80),
x=0代入 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即:B06),
AB= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的半径5
2AAGMN于点G
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,且与 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的外接 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相切,
AG=5AMG=OAB
sinAMG=sinOAB,即: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,解得:AM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即:OM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +8= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
M- <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 0),
同理:BN= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ON=6+ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> = <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> N0 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ),
线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 对应的函数表达式y=kx+b
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 对应的函数表达式y= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> x+ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
3 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> = <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C-310),
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的面= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> = <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

25.1)见详解;(2 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;(3 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> -1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +1

【解析】
1)根据正方形的性质以及等腰直角三角形的性质得∠ACD=BCE <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> CD=CE而即可得到结论
2)先求出DC= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> AD= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 而即可求解;
3)分两种情况:当点D线AECCMAE当点E线ADCCMAD,分求解,即可.
解:(1在等腰直角三角形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,在正方形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,CD=CEDCE=90°
∴∠DCE-BCD=ACB-BCD,即:ACD=BCE
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2正方形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 边长为2
DC=GC=2÷ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> = <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
AD= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
∵∠GDE= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
∴∠ADM=CDE=45°
∴∠ADM=CGM=45°,即:ADCG
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
AM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
3当点D线AECCMAE,如
正方形 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 边长为2
CM=DM=2÷2=1AM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
AD=AM-DM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> -1
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
当点E线ADCCMAD,如
同理可得:CM=DM=2÷2=1AM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
AD=AM+DM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +1
上所述:AM= <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> -1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> +1
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

26.1 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;(2)点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 6-8);(3)当点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 从点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 出发,以每秒1个单位的速度沿 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴正方向移动时, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 秒;沿CO方向在 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 动时 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 秒.

【解析】
1)根据待定系数法将AB两点坐代入函数解析式求解即可;
2)在 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> AB上找到将AB分成21两部分的点Q,此CQ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的面分成21两部分,求出直线CQ与抛物线交点坐即是点P
3)先利用形在 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 内构造 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,求出 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,在 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中由 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,求出OM即可解答,
解:(1)由抛物线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 经过 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得:
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
即:条抛物线对应的函数表达式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)由(1)可知点C标为0,4
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
AB分成21两部分的点有原点和Q2,0),此CQ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的面分成21两部分,如解(2
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为该抛物线上一点(不与点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 重合),
线CP经过Q点,
线CP解析式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 经过C0,4),Q2,0)两点,得:
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
即可线CP解析式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
立函数解析式 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解得: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
P点坐标为6-8),
3)如解(3取点A关于y轴对称点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,垂足H
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
轴对称性可知: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 从点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,以每秒1位的速度远动
当沿 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 正方向移动时 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 秒,
当沿 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> CO方向移动时 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 秒,
上所述:当点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 从点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,以每秒1位的速度沿 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 正方向移动时 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 秒;沿CO方向在 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 动时 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1076/" title="眉山" class="c1" target="_blank">眉山</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 秒.