题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-68255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-13800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-71171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-33672.png)
(1)求动点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-24169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-41738.png)
(2)过
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-69327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-21776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-41738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-60064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-89952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-93564.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-56738.png)
解析
试题分析:(1)由题意,动点
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-68255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-13800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-56738.png)
(2)直线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-61538.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101734-56738.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101733-71171.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101735-48950.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101735-32001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101735-39179.png)
点评:解这道有关焦半径、焦点弦问题时,①借用到抛物线焦点弦的一个重要结论:
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101735-28642.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101725-18093.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101725-19594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101725-98682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101725-12493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101725-54680.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101725-66084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101725-16587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101726-53529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101726-10370.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101726-38751.png)
A.2 | B.![]() | C.2或![]() | D.2或![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101721-91178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101721-92262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101721-38248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101710-60535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101710-56029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101710-75686.png)
(1)求动圆圆心M的轨迹C的方程;
(2)设A、B是曲线C上两动点(异于坐标原点O),若
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101710-80204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101654-40200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101654-58667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101655-67896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101655-85233.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101655-51627.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101655-88009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-44867.png)
(Ⅱ)设抛物线
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-10529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-58920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-78664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101657-23292.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-58920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-10529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101657-46823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101657-30209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101657-47106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101657-97058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101658-14020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101657-46823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101657-97058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-10529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101658-59721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101658-10155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101656-10529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101658-49422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101651-56758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024101651-36035.png)
A.![]() | B.![]() | C.![]() | D.3 |
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