题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233347-60406.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233347-81118.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233342-73334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233342-14433.png)
(1)证明:不论m取何值,直线l与圆C恒相交;
(2)求直线l被圆C截得的弦长最短时的直线方程.
(1)求圆C的方程;
(2)设直线ax-y+1=0与圆C交于A,B两点,是否存在实数a,使得过点P(2,0)的直线l垂直平分弦AB?若存在,求出实数a的值;若不存在,请说明理由.
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233325-52057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233326-96956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233326-59519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233326-52539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233326-41834.png)
(Ⅰ)判断直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233325-52057.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233326-52539.png)
(Ⅱ)设点
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233326-20705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233326-52539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233327-33451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233327-39496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233321-55294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233321-12995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233321-35846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233321-71458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233322-84314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233322-67061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233321-71458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233322-84314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233321-55294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233322-66785.png)
A.![]() | B.![]() | C.![]() | D.![]() |
在平面直角坐标系xOy中,曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233315-33892.png)
(Ⅰ)求圆C的方程;
(Ⅱ)若圆C被直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233315-86054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233316-12872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022233316-35496.png)
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