题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235808-92898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235809-57250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235809-60349.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235809-93536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235808-92898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235809-28976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235810-43867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235810-64026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235810-99498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235810-94895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235811-84336.png)
A.45° | B.60° | C.90° | D.120° |
答案
解析
试题分析:如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235811-46779.jpg)
∵双曲线Γ:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235809-57250.png)
过双曲线Γ的左焦点F作⊙O:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235811-11344.png)
∴OA=OB=a,OF=c,
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235812-42746.png)
∴∠AFB=2∠AFO=2×30°=60°.
故选B.
点评:本题主要考查了双曲线的简单性质.解题的过程中采用了数形结合的思想,使问题的解决更直观.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235759-19663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235800-30239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235800-17898.png)
(Ⅱ)动直线
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235800-33635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235800-28907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235800-17898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235800-23548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235751-39215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235751-45537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235752-63127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235752-67632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235752-91794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235752-73579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235747-39907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235748-56490.png)
A.16 | B.34 | C.16或34 | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235743-47686.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235743-77505.png)
A.椭圆 | B.双曲线 | C.抛物线 | D.圆 |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235739-10879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235739-31815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025235739-68334.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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