题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031428-30150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031428-35300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031429-21013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031428-30150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031429-80819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031428-30150.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031429-54074.png)
解析
试题分析:设圆心
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031428-30150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031429-58947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031429-32738.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031430-55196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031430-18809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031429-54074.png)
点评:本题主要考查求圆的标准方程的方法,求出圆心坐标和半径的值,是解题的关键,属于中档题.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031415-10799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031415-67960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031415-59391.png)
(1)求动圆圆心
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031415-10799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031415-51694.png)
(2)中心在
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-45211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-79511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-26865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-50054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-45211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-14548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031415-51694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-79511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031416-79511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-24703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-90939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031353-43016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-39429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-87373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-83882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-75009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031354-92157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-65743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-86106.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-10396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-66557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031355-97483.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-65488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-52990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-38583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031356-20481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031357-52373.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031348-24904.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031349-52866.png)
A.7或1 | B.![]() | C.![]() | D.7或-1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-93534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-60954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-20394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-93534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031345-90687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023031346-46738.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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