题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230723-94696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230723-95270.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230723-20852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230723-50175.png)
解析
试题分析:易得圆心坐标为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230724-41251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230724-51942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230723-20852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230723-50175.png)
点评:本小题相当于知道圆上的三个点,设出圆的一般方程代入求解也可以.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230716-88879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230716-50934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230716-97475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230700-84202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230700-88183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230700-83756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230700-48017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230701-24895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230701-71510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230701-76416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230701-98219.png)
(1)求椭圆的标准方程;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230702-45620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230702-87254.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230702-62031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230700-84202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230702-99178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230702-33498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230703-56448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230703-56448.png)
(3)如图所示,若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230702-33498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230701-24895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230703-79162.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230703-32894.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230702-33498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230655-15659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230655-80296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230656-31779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230656-19150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230656-78857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230656-25105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230657-71246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230657-23186.png)
已知,圆C:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230649-66380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230649-41398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230649-46359.png)
(1) 当a为何值时,直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230649-41398.png)
(2) 当直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230649-41398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230649-24274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230649-41398.png)
在直角坐标系
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230642-70328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230642-63575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230643-83051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230643-86751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230643-84159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230643-21966.png)
(1)求圆C的直角坐标方程;
(2)设圆C与直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230642-63575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230644-64377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230644-32995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230644-81597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230644-20293.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022230645-74615.png)
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