题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-24046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-93254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-59168.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-78743.png)
若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-28894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-31327.png)
题意知,圆心(3,4)到已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001055-53549.png)
即:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-77771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-90690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-78743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-60348.png)
(Ⅱ)直线与圆相交,斜率必定存在,且不为0,可设直线方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001056-31327.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001057-11778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001057-60420.png)
再由
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001057-11433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001057-48801.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001058-27914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001058-78252.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001058-64542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001058-97908.png)
解析
核心考点
试题【已知圆,直线过定点A(1,0).(Ⅰ)若与圆相切,求的方程;(Ⅱ)若与圆相交于P,Q两点,线段PQ的中点为M,又与的交点为N,求证:为定值.】;主要考察你对点到直线的距离等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001049-35950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001045-42924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001045-33497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001045-61114.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001045-78987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001032-68458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001032-75330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001032-26928.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001017-85608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001017-44767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001017-54142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-77707.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-57961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001017-44767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001017-54142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-77302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-99810.png)
(Ⅰ)若圆M与直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-73233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-73233.png)
(Ⅱ)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-46618.png)
(Ⅲ)是否存在这样的圆N,使得圆N上有且只有三个点到直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-46618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023001018-31322.png)
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