题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233438-24426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233439-10368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233439-84148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233439-13186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233439-87756.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:结合椭圆的定义:到两
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233441-40505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233441-12807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233441-18027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233442-61599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233442-46820.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233440-25557.png)
点评:本题用到椭圆的特点:椭圆上任何一点到两焦点的距离之和为常数
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233442-84315.png)
核心考点
举一反三
A.![]() | B.(0,![]() | C.![]() | D.(0,![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233426-68190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233427-78237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233427-31259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233427-84404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233416-20948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233416-30138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233416-59139.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233417-81035.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233417-49285.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233416-20948.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233416-20948.png)
(2)已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233417-66343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233416-30138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233417-66343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233416-20948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233417-54978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233417-39087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233417-89324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233409-25393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233410-68266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233410-50291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233410-97635.png)
A.2 | B.1 | C.-1 | D.-2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233404-29953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233404-39349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025233405-71860.png)
A.5 | B.2 | C.3 | D.4 |
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