题目
题型:不详难度:来源:
A 4, 3,
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043652-45824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043652-37112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043652-45824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043652-37112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043652-16771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043652-16771.png)
答案
解析
解:由已知,得
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043653-42680.png)
∴实轴长为2a=8,虚轴长为2b=6,
离心率为
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043653-24765.png)
故答案选C
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043646-91773.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043646-56550.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043647-90379.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043642-84255.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043642-47598.gif)
左、右焦点,
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043642-29283.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043642-21975.gif)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043643-36951.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043635-17116.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043635-26567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043635-19834.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043635-96923.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043636-54350.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043636-73407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043636-72889.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043636-36476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043637-27765.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043637-39703.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043630-32198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043630-50003.png)
A
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043630-58696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043630-32198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043630-32198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043625-46713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043625-84240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043626-73858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043626-78968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191024/20191024043626-58196.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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