题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223957-14764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-92439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-84267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-63981.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-83837.png)
解析
试题分析:由圆
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223957-14764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223959-54648.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223957-14764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-92439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-84267.png)
∴圆心到直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-92439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223959-17639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223959-93788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223959-37145.png)
答案为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223958-83837.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-32564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-11972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-16552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-70074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-34504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-11972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223951-72706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-11972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223951-98941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223951-50926.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223950-11972.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223951-85283.png)
A.相交 | B.相切 | C.相离 | D.相交或相切 |
(I)若直线l过点P且被圆C截得的线段长为4
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223935-65701.png)
(II)求过P点的圆C的弦的中点D的轨迹方程
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223928-82990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223928-37773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223920-33699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223920-76747.png)
(1)若直线l:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223920-60164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223920-76747.png)
(2)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223921-80082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022223921-78315.png)
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