题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-68513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-73768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-40939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-37395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-12542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-78698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-68524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-15644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-39951.png)
(Ⅰ)求圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-68513.png)
(Ⅱ)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-78698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-11529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-69501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-52730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-63941.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-50585.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-68513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-73768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-40939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-24770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-15644.png)
建立关于r的方程求出r值,圆的标准确定.
(2)将y=0代入圆的方程求出M,N的坐标,然后再分两种情况证明.
(i) 当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-92309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-63941.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-21905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-37395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-21905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-66286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-99831.png)
(Ⅰ)设圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-68513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-35641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-40627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-24770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-15644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-93852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-48709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-68513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-50585.png)
(Ⅱ)把
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-60585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-50585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-73077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-33187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-80796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-74669.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-92309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-63941.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-21905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-37395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-21905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-66286.png)
联立方程
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-92902.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034040-73768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034043-49127.png)
设直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034042-21905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034044-43179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034044-61416.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034044-22896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034044-74119.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034044-88812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034044-25438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034045-52818.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034045-57336.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034045-31083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-63941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034041-63941.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034030-85360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034026-49545.png)
A.![]() | B.![]() ![]() | C.![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034017-31203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034017-24688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034017-65218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034017-24688.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034018-76880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023034013-25420.png)
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