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【327889】2023年四川省雅安市中考数学真题

时间:2025-01-20 20:35:51 作者: 字数:17429字
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2023年四川省雅安市中考数学真题

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得分




一、选择题

1.0 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 2四个数中,负数是(       
A
0
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
D
2

2.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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
0
C
1
D
19

3.如图,是由3个相同的小正方体搭成的几何体,它的主视图是(       
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    

4.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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

5. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值是(       
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C
5
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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

6.下列运算正确的是(       
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

7.不等式组 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的解集是(       
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

8.如图,某小区要绿化一扇形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 空地,准备在小扇形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 内种花在其余区域内(阴影部分)种草,测得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则种草区域的面积为(       
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

9.某位运动员在一次射击训练中, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 次射击的成绩如图,则这10次成绩的平均数和中位数分别是(       
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

10.在平面直角坐标系中.将函数 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的图象绕坐标原点逆时针旋转 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再向上平移1个单位长度,所得直线的函数表达式为(       
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

11.如图,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,F <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上一点, <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点E <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的延长线交 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的延长线于点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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
A
4
B
6
C
8
D
10

12.如图,二次函数 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的图象与x轴交于 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> B两点,对称轴是直线 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,下列结论中,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;②点B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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;④对于任意实数m,都有 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,所有正确结论的序号为(       
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
A.①②
B
.②③
C
.②③④
D
.③④

评卷人

得分




二、填空题

13.在一个不透明的口袋中,装有1个红球若干个白球,它们除颜色外都相同,从中任意摸出一个球,摸到红球的概率为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则此口袋中白球的个数为____________.

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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值为__________

15.已知关于x的方程 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的一个根为1,则该方程的另一个根为__________

16.如图,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> P为边 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上一动点,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点E,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的最小值为___________
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    

17.如图.四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则AB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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

评卷人

得分




三、解答题

18.1)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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)先化简,再求值: <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .其中 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

19.某校为了调查本校学生对航空航天知识的知晓情况.开展了航空航天知识竞赛,从参赛学生中,随机抽取若干名学生的成绩进行统计,得到如下不完整的统计图表:

成绩/

频数/

频率

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

10

0.1

 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

15

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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

a

0.35

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

40

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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
请根据图表信息解答下列问题:
(1)
abc的值;
(2)
补全频数直方图;
(3)
某班有2名男生和1名女生的成绩都为100分,若从这3名学生中随机抽取2名学生参加演讲,用列表或画树状图的方法,求抽取的2名学生恰好为11女的概率.

20.如图,已知 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上两点, <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的延长线于点 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的面积.

21.李叔叔批发甲、乙两种蔬菜到菜市场去卖,已知甲、乙两种蔬菜的批发价和零售价如下表所示:

品名

甲蔬菜

乙蔬菜

批发价/(元/kg

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

零售价/(元/kg

 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

(1)若他批发甲、乙两种蔬菜共 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 元.求批发甲乙两种蔬菜各多少千克?(列方程或方程组求解)
(2)
若他批发甲、乙两种蔬菜共 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> m元,设批发甲种蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,求mn的函数关系式;
(3)
在(2)的条件下,全部卖完蔬菜后要保证利润不低于 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 元,至少批发甲种蔬菜多少千克?

22.如图,在平面直角坐标系中,四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是边长为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的正方形.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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 在坐标轴上.反比例函数 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的图象经过点 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
(1)求反比例函数的表达式;
(2)
D在反比例函数图象上,且横坐标大于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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的函数表达式.

23.如图,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 交于点D,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的中点,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的切线;
(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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长;
(3)
在(2)的条件下,点P <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上一动点,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的最大值.

24.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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,对称轴是直线 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
(1)求此抛物线的函数表达式及顶点M的坐标;
(2)
若点B在抛物线上,过点Bx轴的平行线交抛物线于点C、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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是等边三角形时,求出此三角形的边长;
(3)
已知点E在抛物线的对称轴上,点D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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是否存在点F,使以点ADEF为顶点的四边形为菱形?若存在,请直接写出点F的坐标;若不存在,请说明理由.

参考答案

1.C

【解析】
根据负数的定义∶ 比0小的数叫做负数,即可得出答案.
解:0既不是正数也不是负数, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是负数, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 2是正数,
故选:C

2.B

【解析】
根据零指数幂的性质,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
=0

故选B

3.C

【解析】
根据主视图的定义即可判断,从正面看到的图形即是主视图.
从正面看可以得到从左到右两列,正方形的个数依次为21
据此可知主视图为:
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>        
故选:C

4.B

【解析】
根据两直线平行,同旁内角互补可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的度数,根据垂直的定义可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 即可得出答案.
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:B

5.A

【解析】
把所求代数式 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 变形为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,然后把条件整体代入求值即可.
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:A

6.D

【解析】
根据整式的加减、幂的乘方、同底数幂的乘除法逐项判断即可.
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 不是同类项,不可合并,此项运算错误;
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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,,此项运算错误;
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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,,此项运算错误;
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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,此项运算正确,
故选:D

7.D

【解析】
分别求解两个不等式,得到不等式组的解集,然后判断即可.
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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解不等式①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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解不等式②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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
不等式组的解集为: <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:D

8.B

【解析】
种草区域的面积等于大扇形面积减去小扇形面积,利用利用扇形的面积公式计算即可.
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
种草区域的面积为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:B

9.B

【解析】
根据折线图将成绩从小到大依次排列,然后求中位数与平均数即可.
解:由图可知, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 次的成绩由小到大依次排列为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
∴10
次成绩的中位数为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
平均数为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故B正确.
故选:B

10.A

【解析】
先求出函数 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的图象绕坐标原点逆时针旋转 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的函数解析式,再根据函数图象的平移规律即可求出平移后的解析式.
解:∵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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是函数 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 图象上的点,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 绕原点逆时针旋转 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则旋转后图象经过原点和 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
将函数 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的图象绕坐标原点逆时针旋转 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 得到图象的解析式为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
根据函数图象的平移规律,再将其向上平移1个单位后的解析式为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选A

11.C

【解析】
由平行四边形的性质可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> x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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,解之即可.
四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为平行四边形,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:C

12.C

【解析】
根据抛物线开口方向可得a的符号,可对①进行判断;根据抛物线的对称轴 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,由二次函数的对称性可得B点坐标,由图象即可对②进行判断;根据点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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 代入解析式利用加减消元法可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,从而判定③,再由 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时函数取最大值判定④.
解:∵抛物线开向下,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故①错误,
抛物线与y轴交于正半轴,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
设点B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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
抛物线对称轴为直线 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点A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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故②正确,
A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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点B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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故③正确;
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,抛物线对称轴为直线 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时函数最大值,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
综上所述:正确的结论有②③④,
故选:C

13.3

【解析】
根据概率公式即可得出总数,再根据总数算出白球个数即可.
摸到红球的概率为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,且袋中只有1个红球,
袋中共有4个球,
白球个数=4-1=3.
故答案为:3.

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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
先将代数式根据平方差公式分解为: <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再分别代入求解.
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
设方程的另一个根为m,根据两根之积等于 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得到关于m的一元一次方程,解之即可求解.
设方程的另一个根为m
根据题意得, <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用勾股定理列式求出 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,判断出四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是矩形,根据矩形的对角线相等可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再根据垂线段最短可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值最小,然后根据直角三角形的面积公式列出方程求解即可.
解:如图,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点E <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是矩形,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
由垂线段最短可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值最小,此时线段 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值最小,
此时, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
代入数据: <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的最小值为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,先证明 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是等边三角形, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 垂直平分 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再解三角形求出 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,最后运用勾股定理求得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 即可.
解:如图: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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是等边三角形,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .

18.14;(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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)根据负整数指数幂,化简绝对值,算术平方根的性质进行计算即可;
2)根据分式的加减计算括号内的,同时将除法转化为乘法运算,然后根据分式的性质计算,最后将字母的值代入求解即可
解:(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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

19.(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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
(2)
见解析
(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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的人数和频率可求抽取总人数,再由频率的定义求出abc即可;
2)由(1)中a的值,补全频数分布直方图即可;
3)画树状图,共有6种等可能的结果,其中选出的2名学生恰好为一名男生、一名女生的结果有4种,再由概率公式求解即可.
1)解:由题意得:抽取学生总数 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> (人),
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)解:补全频数分布直方图如图:
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
3)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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
共有6种等可能的结果,其中选出的2名学生恰好为一名男生、一名女生的结果有4种,
选出的2名学生恰好为一名男生、一名女生的概率为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

20.(1)见解析
(2)9

【解析】
1)根据平行四边形的性质得到 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,结合 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据全等三角形的判定定理( <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> )即可得到结论;
2)根据已知条件得到解直角三角形,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,进而可得解直角三角形得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再根据平行四边形的面积公式即可求解.
1)证明:∵ <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> (负值已舍去),
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
平行四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

21.(1)甲蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,乙蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)设批发甲蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,乙蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据批发甲蔬菜和乙蔬菜两种蔬菜共 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,用去了 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 元钱,列方程求解;
2)根据总价等于单价×数量,由甲、乙两种蔬菜总价和为m,即可得出mn的函数关系;
3)根据当天全部售完后所赚钱数不少于 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 元,列不等式求解即可.
1)解:设批发甲蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,乙蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
由题意得: <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
乙蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
答:故批发甲蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,乙蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)解:设批发甲种蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,乙蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
由题意得: <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
答:mn的函数关系为: <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
3)设批发甲种蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,乙蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
由题意得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
答:至少批发甲种蔬菜 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

22.(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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)根据四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是边长为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的正方形求出点 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坐标,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 求出k
2)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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,过点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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 面积列方程,求出点D坐标,再由待定系数法求出直线 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的函数表达式.
1)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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 四边形 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是边长为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
即反比例函数的表达式为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)解: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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,过点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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,经检验 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,是符合题意的根,
即点 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
设直线 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的函数解析式为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
即: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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的函数解析式为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

23.(1)证明见解析;
(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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,由圆周角定理得到 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,由直角三角形斜边中线的性质结合等腰三角形的性质证得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,由等腰三角形的性质得到 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得到 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,由切线的判定即可证得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相切;
2)由直角三角形斜边中线的性质求出 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据三角函数的定义即可求出 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;,
3)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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 边高为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即可得出当 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取最大值时, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取最大值,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 进而求解即可.
1)证明: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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,如图所示,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的半径,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相切;
2)解:由(1)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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
又∵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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> (负值以舍去),
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
3)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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 边高为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
由(2)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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是直径,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取最大值时, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 也取最大值,
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取最大值时, <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取最大值,
此时 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 边高为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取最大值为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 半径 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
综上所述: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的最大值为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

24.(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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
(3)
存在点F,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,以点ADEF为顶点的四边形为菱形.

【解析】
1)根据对称轴 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和过点 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 列二元一次方程组求解即可;
2)如图:过点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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> D,设点 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ;然后表示出 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是等边三角形可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据三角函数解直角三角形可得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,进而求得 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 即可解答;
3)如图可知: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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为菱形的边和对角线,然后通过作图、菱形的性质即可解答.
1)解:由题意可得:
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
所以抛物线的函数表达式为 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则顶点M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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)解:如图:过点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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> D
设点 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是等边三角形,
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> (舍去)
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
该三角形的边长 <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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
3)解:存在点F,使以点ADEF为顶点的四边形为菱形
如图: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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 作为菱形的边,
E的纵坐标为大于零时,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 关于直线 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的对称线段交 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> E,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,作点E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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的对称点F,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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为菱形,由对称性可得F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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故存在点F,使以点ADEF为顶点的四边形为菱形,此时 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
E的纵坐标为小于零时,同理可知: <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 三点共线,不符合题意.
 <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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 作为菱形的对角线时,
如图: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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的中点G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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
则有: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
综上,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/1109/" title="雅安" class="c1" target="_blank">雅安</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/1109/" title="雅安" class="c1" target="_blank">雅安</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,以点ADEF为顶点的四边形为菱形.