题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040851-91040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040851-10191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040852-70923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040852-13039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040852-91391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040852-60239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040853-63411.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040854-43504.png)
解答:解:由题设条件可知△ABC为等腰三角形,只要∠AF2B为钝角即可,
所以有
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040854-43504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040854-26247.png)
故选B.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040843-30083.gif)
已知椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040843-81565.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040843-39880.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040844-37731.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040844-43496.gif)
(Ⅰ)求曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040844-37731.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040844-10699.gif)
(Ⅱ)直线
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040844-95282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040844-37731.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040844-27799.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040845-47303.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040845-34642.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040845-99798.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040835-60110.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040835-97270.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040835-16684.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040835-35518.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040836-10832.gif)
(Ⅰ)写出双曲线C的离心率
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040836-38209.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040836-53055.gif)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040836-41103.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040836-57158.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040837-86165.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040830-83427.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040830-11939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040830-58136.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040831-36270.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040831-31643.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040831-10036.gif)
A.![]() | B.![]() ![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040824-31670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040824-23188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040825-89639.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040825-18130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040825-48391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040825-24267.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040816-88841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040816-24339.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040817-19430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040817-69431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040817-96172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040817-74294.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040817-85209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026040818-88550.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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