题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045906-30141.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045906-72433.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045906-38150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-42525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-49020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045906-38150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-48158.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-16145.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-83633.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-49020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045908-72440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045908-14941.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-16145.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045908-30916.gif)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045906-38150.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045909-42152.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045909-37263.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045910-71783.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045910-11668.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045910-92983.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045910-25955.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045911-20502.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045911-49613.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045911-13819.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045911-80676.gif)
于是
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045911-95396.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045912-71879.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045912-18826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045912-83169.gif)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045912-35443.gif)
故动点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045907-16145.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045909-37263.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045913-78035.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045909-26835.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045900-74959.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045849-38055.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045850-21649.gif)
(1)指出圆C的圆心和半径;(2)求出圆心C的轨迹方程.
![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045841-85175.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045841-45432.gif)
(Ⅰ)求θ的取值范围;
(Ⅱ)证明这4个交点共圆,并求圆半径的取值范围.
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045834-27668.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045835-44300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045835-78807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045835-44300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045835-35861.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045835-12166.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045835-95892.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045836-75447.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023045836-44422.gif)
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