题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013448-76556.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013448-64042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013448-29357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013448-51394.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:连接上顶点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013449-84888.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013449-80960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013449-24004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013450-68125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013450-57524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013450-87761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013450-99975.png)
点评:求离心率关键是找到关于
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013450-34381.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013440-10426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013440-63522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013441-89327.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013440-10426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013423-32632.png)
求焦点为(-5,0)和(5,0),且一条渐近线为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013417-42491.png)
已知椭圆的中心在坐标原点
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013409-35711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013410-95918.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013410-88341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013410-13627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013410-11880.png)
椭圆于
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013411-78191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013411-98645.png)
(Ⅰ)求椭圆的方程;(Ⅱ)当直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013410-11880.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013411-45070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013406-69957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013406-19432.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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