题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-92555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-16434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-95831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-72048.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-45341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021002-54516.png)
解析
(1)根据椭圆的两个焦点分别为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-92555.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-16434.png)
(2)由于CD为过左焦点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-95831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026021001-72048.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020954-21850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020954-95808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020955-88773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020955-73590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020955-22522.png)
(1)求点P的轨迹方程;
(2)若直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020955-83893.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020955-88193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020956-41642.png)
(3)设点P的轨迹是曲线C,点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020956-40419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020949-83140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020949-15909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020949-82086.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020949-83140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020949-83140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020949-83140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020949-83140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020937-25662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020937-25184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020937-83365.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020937-25662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020938-35285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020938-75042.png)
(I)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020937-25662.png)
(II)设抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020938-56777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020938-18903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020939-36787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020938-56777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020937-25662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020939-92979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020938-56777.png)
如图所示,点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020923-73116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020923-24949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020924-39546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020924-98452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020924-32003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020924-30179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020924-87645.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-45951.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-54644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-97255.png)
(Ⅰ)当点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020923-73116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020923-24949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020924-30179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-91511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-99369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-91511.png)
(Ⅱ)设轨迹
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-91511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020924-32003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020926-36725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020926-46711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020926-59686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020926-82310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-91511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020927-72055.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020927-21290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020927-14633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020927-99398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020927-23497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020925-99369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020919-46080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020919-38858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020919-77574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020920-65318.png)
A、
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020920-68580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020920-49933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026020920-87389.png)
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