题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-54109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-41758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-34851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-64620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-67822.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:不妨设椭圆方程为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013331-53960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-64620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-67822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013332-86397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013332-72712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013330-67822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013332-62666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013332-96287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013332-59346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013332-78711.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013333-83343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013333-16474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013333-68770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013333-81373.png)
点评:求圆锥曲线的离心率是常见题型,常用方法:①直接利用公式
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013333-17061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013333-26451.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013334-51446.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013334-47950.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013323-12508.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013323-40013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013318-77135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013318-50749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013318-77135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013318-94743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013318-48769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013318-77135.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013318-30264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013319-64009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013319-48027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013308-40433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013308-48573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013308-52848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013309-83484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013309-90336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013309-44411.png)
⑴当直线的倾斜角为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013309-13684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013309-13001.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013310-99578.png)
⑵当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013310-46216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013310-75767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013308-52848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013302-39173.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013251-79857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013251-70251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013251-37045.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-25832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-25836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-81161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-25832.png)
(Ⅰ)求动圆圆心
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013251-79857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-36063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-25832.png)
(Ⅱ)若动直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-47953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-36063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-59140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-47953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-25832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-92202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-47953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013253-63460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013253-14485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026013252-47953.png)
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