题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003908-20882.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003909-35336.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003909-63708.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003909-14533.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003909-80044.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-25474.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-43134.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-33527.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-43134.gif)
(ⅱ)当斜率存在时,设斜率为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-39887.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003911-79725.gif)
整理得:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003911-38000.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003911-86585.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003911-65042.gif)
所以直线的方程为:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-25474.gif)
综上所述,过点M的直
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003912-57027.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-25474.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003910-43134.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003904-63850.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003905-29661.gif)
A.![]() | B.![]() | C.5 | D.6 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003859-57208.gif)
A.2x+4y-1="0" | B.4x+3y-l=0 |
C.2x-3y![]() | D.3x+2y=0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003855-64741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003852-50548.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003852-79309.gif)
A.![]() | B.![]() | C.2![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003848-47413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023003848-52010.gif)
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