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【327884】2023年四川省泸州市中考数学真题

时间:2025-01-20 20:34:51 作者: 字数:18292字
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2023年四川省泸州市中考数学真题

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得分




一、选择题

1.下列各数中,最大的是(  )
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
B
0
C
2
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

2.泸州市2022年全市地区生产总值( <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> )为2601.5亿元,将数据260150000000用科学记数法表示为(  )
A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

3.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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,若 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

4.一个立体图形的三视图如图所示,则该立体图形是(  )
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
A.圆柱
B
.圆锥
C
.长方体
D
.三棱柱

5.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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

6.123455六个数中随机选取一个数,这个数恰为该组数据的众数的概率为(  )
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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

7.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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的对角线 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的平分线与边 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中点,若 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
A1
B
2
C
3
D
4

8.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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的一元二次方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的根的情况是(  )
A
.没有实数根
B
.有两个相等的实数根
C
.有两个不相等的实数根
D
.实数根的个数与实数 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的取值有关

9.《九章算术》是中国古代重要的数学著作,该著作中给出了勾股数 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的计算公式: <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是互质的奇数.下列四组勾股数中,不能由该勾股数计算公式直接得出的是(  )
A
345
B
51213
C
6810
D
72425

10.若一个菱形的两条对角线长分别是关于 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的一元二次方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的两个实数根,且其面积为11,则该菱形的边长为(  )
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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 在斜边 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为直径的半圆 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相切于点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,与 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相交于点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .若 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长是(  )
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

12.已知二次函数 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是自变量),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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时对应的函数值 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 均为正数,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的取值范围为(  )
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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

评卷人

得分




二、填空题

13.8的立方根为______

14.在平面直角坐标系中,若点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 与点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 关于原点对称,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值是___________

15.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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的二元一次方程组 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的解满足 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,写出 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的一个整数值___________

16.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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是正方形 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的边 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的三等分点, <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是对角线 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上的动点,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取得最小值时, <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值是___________
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    

评卷人

得分




三、解答题

17.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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

18.如图,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 在线段 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

19.化简: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

20.某校组织全校800名学生开展安全教育,为了解该校学生对安全知识的掌握程度,现随机抽取40名学生进行安全知识测试,并将测试成绩(百分制)作为样本数据进行整理、描述和分析,下面给出了部分信息.
将样本数据分成5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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,并制作了如图所示的不完整的频数分布直方图;
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 这一组的成绩分别是:808183838485868686878889
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
根据以上信息,解答下列问题:
(1)
补全频数分布直方图;
(2)
抽取的40名学生成绩的中位数是___________
(3)
如果测试成绩达到80分及以上为优秀,试估计该校800名学生中对安全知识掌握程度为优秀的学生约有多少人?

21.端午节是中国传统节日,人们有吃粽子的习俗.今年端午节来临之际,某商场预测A粽子能够畅销.根据预测,每千克A粽子节前的进价比节后多2元,节前用240元购进A粽子的数量比节后用相同金额购进的数量少4千克.根据以上信息,解答下列问题:
(1)
该商场节后每千克A粽子的进价是多少元?
(2)
如果该商场在节前和节后共购进A粽子400千克,且总费用不超过4600元,并按照节前每千克20元,节后每千克16元全部售出,那么该商场节前购进多少千克A粽子获得利润最大?最大利润是多少?

22.如图,某数学兴趣小组为了测量古树 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的高度,采用了如下的方法:先从与古树底端 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 在同一水平线上的点A出发,沿斜面坡度为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的斜坡 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 前进 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 到达点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再沿水平方向继续前进一段距离后到达点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> .在点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 处测得古树 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的顶端 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的俯角为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,底部 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的俯角为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,求古树 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的高度(参考数据: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,计算结果用根号表示,不取近似值).
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    

23.如图,在平面直角坐标系 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴分别相交于点AB,与反比例函数 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的图象相交于点C,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点C的横坐标为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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
(1)
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值;
(2)
平行于 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴的动直线与 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 和反比例函数的图象分别交于点DE,若以BDEO为顶点的四边形为平行四边形,求点D的坐标.

24.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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的弦 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的切线交 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 平分 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上一点,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,若 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长.

25.如图,在平面直角坐标系 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 与坐标轴分别相交于点AB <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 三点,其对称轴为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
(1)求该抛物线的解析式;
(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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是该抛物线上位于第一象限的一个动点,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 分别与 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,求 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长;
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的面积分别为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,且满足 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,求点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坐标.

参考答案

1.C

【解析】
首先化简绝对值,然后把选项中的4个数按从小到大排列,即可得出最大的数.
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
最大的数是2
故选:C

2.B

【解析】
科学记数法的表示形式为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为整数.确定 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值时,要看把原数变成 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,小数点移动了多少位, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的绝对值与小数点移动的位数相同.当原数 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为正整数;当原数 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为负整数.
解:260150000000 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:B

3.A

【解析】
先根据两直线平行、同旁内角互补求得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的度数,然后再根据对顶角的性质解答即可.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:A

4.D

【解析】
根据三视图进行判断即可.
解:根据主视图和左视图为矩形判断出是柱体,根据俯视图是三角形形可判断出这个几何体应该是三棱柱.
故选:D

5.B

【解析】
根据运算法则,对每一个选项进行计算排除即可.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 不是同类项,不可以合并,故选项计算错误,不符合题意;
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故选项计算正确,符合题意;
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 不是同类项,不可以合并,故选项计算错误,不符合题意;
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故选项计算错误,不符合题意;
故选: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

6.B

【解析】
由众数的概念可知六个数中众数为5,然后根据简单概率计算公式求解即可.
解:123455六个数中,数字5出现了2次,出现的次数最多,
故这组数据的众数为5
所以从六个数中随机选取一个数,这个数恰为该组数据的众数的概率为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:B

7.A

【解析】
根据平行四边形的性质、平行线的性质、角平分线的定义以及等腰三角形的判定可得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,进而可得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再根据三角形的中位线解答即可.
解:∵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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是平行四边形, <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 平分 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中点,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:A.

8.C

【解析】
根据一元二次方程根的判别式求出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的一元二次方程 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 有两个不相等的实数根,故C正确.
故选:C

9.C

【解析】
首先证明出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得到ab是直角三角形的直角边然后由 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是互质的奇数逐项求解即可.
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
ab是直角三角形的直角边,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是互质的奇数,
∴A
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
∴3
45能由该勾股数计算公式直接得出;
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
∴5
1213能由该勾股数计算公式直接得出;
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是互质的奇数,
∴6
810不能由该勾股数计算公式直接得出;
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
∴7
2425能由该勾股数计算公式直接得出.
故选:C

10.C

【解析】
根据一元二次方程根与系数的关系,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据菱形的面积得到 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用勾股定理以及完全平方公式计算可得答案.
解:设方程 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的两根分别为ab
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
ab分别是一个菱形的两条对角线长,已知菱形的面积为11
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
菱形对角线垂直且互相平分,
该菱形的边长为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,故C正确.
故选:C

11.B

【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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,首先根据勾股定理求出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,然后证明出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用相似三角形的性质得到 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,证明出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用相似三角形的性质求出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
如图所示,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为直径的半圆 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 相切于点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:B

12.D

【解析】
首先根据题意求出对称轴 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,然后分两种情况: <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,分别根据二次函数的性质求解即可.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时对应的函数值 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 均为正数,
此时抛物线与x轴没有交点,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时对应的函数值 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 均为正数,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时对应的函数值 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 均为正数,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的取值范围为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故选:D

13.2

【解析】
根据立方根的意义即可完成.
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
∴8
的立方根为2
故答案为:2

14.1

【解析】
根据关于原点对称的两个点,横、纵坐标互为相反数,进行解答即可.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 与点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 关于原点对称,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案为:1

15.7(答案不唯一)

【解析】
先解关于xy的二元一次方程组的解集再将 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 代入,然后解关于a的不等式的解集即可得出答案.
将两个方程相减得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的一个整数值可以是7
故答案为:7(答案不唯一).

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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
作点F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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的对称点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取得最小值,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的垂线段,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点K,根据题意可知点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 落在 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上,设正方形的边长为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的边长,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即可解答.
解:作点F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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的对称点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的垂线段,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点K
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
由题意得: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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 落在 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 上,且根据对称的性质,当P点与 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 重合时 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取得最小值,
设正方形 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的边长为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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是正方形,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 取得最小值时, <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的值是为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

17.3

【解析】
根据负整数指数幂和零指数幂运算法则,特殊角的三角函数值,进行计算即可.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

18.见解析

【解析】
首先根据平行线的性质得到 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,然后证明出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,最后根据全等三角形的性质求解即可.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

19. <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
先计算括号内的,通分后利用同分母的分式运算法则求解,然后将除法变成乘法,约分即可得到结果.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

20.(1)见解析
(2)82
(3)
估计该校800名学生中对安全知识掌握程度为优秀的学生约有 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 人.

【解析】
1)根据总人数减去其他组的人数求得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的人数,即可补全直方图;
2)根据中位数为第2021个数据的平均数,结合直方图或分布表可得;
3)用样本估计总体即可得.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ()
补全的频数分布直方图如下图所示,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2021个数为8183
抽取的40名学生成绩的中位数是 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
故答案为:82
3)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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> (人),
答:估计该校800名学生中对安全知识掌握程度为优秀的学生约有 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 人.

21.(1)节后每千克A粽子的进价为10
(2)
节前购进300千克A粽子获得利润最大,最大利润为3000

【解析】
1)设节后每千克A粽子的进价为x元,则每千克A粽子节前的进价为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 元,根据节前用240元购进A粽子的数量比节后用相同金额购进的数量少4千克,列出方程,解方程即可;
2)设该商场节前购进m千克A粽子,则节后购进 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 千克A粽子,获得的利润为w元,根据利润 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 售价 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 进价列出关系式,根据总费用不超过4600元,求出m的范围,根据一次函数函数增减性,求出最大利润即可.
1)解:设节后每千克A粽子的进价为x元,则每千克A粽子节前的进价为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 元,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 都是原方程的解,但 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 不符合实际舍去,
答:节后每千克A粽子的进价为10元.
2)解:设该商场节前购进m千克A粽子,则节后购进 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 千克A粽子,获得的利润为w元,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
wm的增大而增大,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,w取最大值,且最大值为: <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
答:节前购进300千克A粽子获得利润最大,最大利润为3000元.

22.古树 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的高度为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
延长 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 交于点G,过点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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点F,根据斜面 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坡度为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据勾股定理得出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,求出 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,证明四边形 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为矩形,得出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,根据三角函数求出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,最后求出结果即可.
解:延长 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 交于点G,过点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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点F,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
斜面 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坡度为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,根据勾股定理得: <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,负值舍去,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为水平方向, <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为竖直方向,
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 为矩形,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
答:古树 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的高度为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

23.(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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
(2)
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用待定系数法即可求得直线的式,再求得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,据此即可求解;
2)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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,解方程即可求解.
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
直线 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 经过点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
直线的解析式为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
C的横坐标为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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的图象经过点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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)解:由(1)得反比例函数的解析式为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,则点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
BDEO为顶点的四边形为平行四边形,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,整理得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
整理得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
整理得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
综上,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

24.(1)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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)利用切线的性质得到 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用圆周角定理得到 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,利用垂径定理推出 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,据此可证明 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即可证明 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 平分 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点M,利用垂径定理求得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,在 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 中,利用勾股定理求得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,据此求解即可.
1)解: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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的切线,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的直径,且 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 平分 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)解: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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,过点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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的直径,且 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

25.(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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
(2)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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>

【解析】
1)根据抛物线对称轴为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,再将 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 代入抛物线,根据待定系数法求得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即可解答;
2)①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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,点 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坐标,即可得到直线 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的解析式,列方程求出点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坐标,最后根据 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 列方程,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的长;
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 分别作 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的垂线段,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的垂线段,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点I,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,得到直线 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的解析式,求出点D的坐标,即可得到点 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的坐标,将点E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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 解方程,即可解答.
1)解:根据抛物线的对称轴为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 代入抛物线可得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 抛物线的解析式为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
2)解: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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 时,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,将 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,将 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
联立方程 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是方程的解,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 是该抛物线上位于第一象限的一个动点,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 轴正半轴,
 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
解:如图,过 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 分别作 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的垂线段,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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 的垂线段,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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 于点I
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>    
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,即点D的横坐标为 <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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> ,将 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
代入得 <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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a> 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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>
 <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>  <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/1074/" title="四川省" class="c1" target="_blank">四川省</a> <a href="/tags/1075/" title="泸州" class="c1" target="_blank">泸州</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/1075/" title="泸州" class="c1" target="_blank">泸州</a> <a href="/tags/1004/" title="四川" class="c1" target="_blank">四川</a>