题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072537-16956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072537-25597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072538-19841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072538-58757.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072538-88956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072539-98265.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072539-67564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072539-51484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072539-57022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072539-32411.png)
A.![]() | B.![]() ![]() | C.![]() | D.![]() ![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072541-70654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072541-88490.png)
解:∵向量
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072541-68189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072542-14718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072542-12818.png)
对应的图形是双曲线,a2=16,b2=9
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072542-41963.png)
可得点F(5,0)恰好是双曲线的右焦点,
设双曲线的左焦点为F’(-5,0),连接PF’、OQ
∵OQ是△PFF’的中位线,|PF-PF’|=2a=8
∴当点P在双曲线左支上时,
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072542-20522.png)
当点P在双曲线右支上时,
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072543-78379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072543-76766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072543-76766.png)
选B
| |
核心考点
试题【已知向量,,曲线上一点到点的距离为,为的中点,为坐标原点,则等于( )A.B.或C.D.或】;主要考察你对平面向量数量积的意义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072532-54241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072532-11618.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072533-26374.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072533-48698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072533-82200.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072532-54241.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072532-11618.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072533-48911.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072528-14334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072529-63826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072528-14334.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072529-83366.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072529-63826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072523-30633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072524-35669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072524-74884.png)
A.-![]() | B.![]() | C.-![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072519-96191.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072520-79949.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072520-70692.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072520-88692.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191104/20191104072512-85050.png)
A.![]() | B.![]() | C.![]() | D.1 |
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