题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134620-89277.png)
A.(![]() ![]() | B.(![]() ![]() | C.(![]() ![]() | D.(0,+![]() |
答案
解析
试题分析:
解:椭圆的长半轴长为
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134621-94229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134621-32353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134621-48822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134621-98353.jpg)
根据题意:
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134622-98833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134622-23529.png)
因为在等腰三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134622-32283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134622-29392.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134623-61990.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134623-45481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134623-85322.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134624-84120.png)
故选C.
核心考点
试题【已知中心在原点、焦点在x轴上的椭圆C1与双曲线C2有共同的焦点,设左右焦点分别为F1,F2,P是C1与C2在第一象限的交点,PF1F2是以PF1为底边的等腰三角】;主要考察你对椭圆的定义与方程等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134556-19778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134557-14743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134557-54193.png)
(1)求椭圆C的方程;
(2)过右焦点F2作直线l 与椭圆C交于A,B两点,设
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134557-10621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134557-67857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134558-16627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134537-36003.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134537-22450.png)
(2)已知直线
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134537-60367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134537-22450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134537-31473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134538-20439.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134538-88330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134538-10998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134538-22433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134538-33145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134539-32716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134531-65777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134531-51316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134531-70216.png)
A.![]() | B.1或![]() | C.1或![]() | D.1 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134522-58630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134522-32584.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134522-27643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134523-70706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134523-62569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134523-62830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134522-32584.png)
A.圆 | B.椭圆 | C.抛物线 | D.双曲线 |
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134513-38910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134513-54754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134514-18483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134513-54754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191023/20191023134514-53859.png)
A.10 | B.6 | C.12 | D.14 |
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