题目
题型:不详难度:来源:
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153437-14411.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153437-72523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153437-25588.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153437-95513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153437-17771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153437-14411.png)
核心考点
举一反三
1)求经过直线x-y=1与2x+y=2的交点,且平行于直线x+2y-3=0的直线方程.
2)在直线x-y+4="0" 上求一点P, 使它到点 M(-2,-4)、N(4,6)的距离相等.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153423-38930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153423-55637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153424-56946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153424-80857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153424-38264.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153424-80857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153424-38264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153424-80857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153424-38264.png)
两条互相平行的直线分别过点A(6,2)和B(-3,-1),并且各自绕着A,B旋转,如果两条平行直线间的距离为d.
求:1)d的变化范围;
2)当d取最大值时两条直线的方程.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-68793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-97340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-88967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-92972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-25791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-51116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-90164.jpg)
(I)求点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-92972.png)
(II)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-81942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-92972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-61008.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-50642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-92972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-49093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-82612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-49093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-82612.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153404-81942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153405-67076.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153405-89280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153405-89457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153405-43606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-15345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-41556.png)
(Ⅰ)当直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-65732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-84420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-65732.png)
(Ⅱ)当直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-65732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-65732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022153358-65732.png)
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