题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161508-18569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161508-66891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161509-12563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161509-36969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161509-25791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161509-12563.png)
A.0个 | B.1个 | C.2个 | D.4个 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161509-41918.png)
由椭圆的定义可得 MF1 +MF2=2a=10,又 2c=6,
∴△
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161509-36969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161510-65738.png)
又△
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161509-36969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161510-65738.png)
故选 C.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161452-84663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161453-25354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161453-93735.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161453-70296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161453-72918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161454-27982.png)
已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161438-58949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161439-89387.png)
(Ⅰ)若椭圆的离心率为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161439-42317.png)
(Ⅱ)若向量
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161439-75097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161439-66051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161440-44971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161434-13346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161434-73177.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161434-12598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-92180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-79822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-34110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-96716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-83828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-46123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-37120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-31355.png)
(Ⅰ)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-92180.png)
(Ⅱ)若点
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-38656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-92180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-34110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-96716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-56399.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-90813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-17968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-35115.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-54530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-40052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-56384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-71151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161423-71151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161422-92180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161358-50174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161358-58527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-15506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-23778.jpg)
(Ⅰ)求椭圆的方程;
(Ⅱ)椭圆的左、右顶点分别为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-29732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-15739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-64635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-57905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-64635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161358-50174.png)
连结
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161359-19719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161400-70997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161400-75479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161400-21347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161400-55377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161400-50433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023161400-55377.png)
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