题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220529-58755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220529-99392.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220530-89989.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220530-52477.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220530-58653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220530-19347.png)
∵|AF2|+|AF1|=4,|AF2|-|AF1|=2a,
∴|AF2|=2+a,|AF1|=2-a.
在Rt△F1AF2中,∠F1AF2=90°,
∴|AF1|2+|AF2|2=|F1F2|2,
则(2-a)2+(2+a)2=(2
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220530-52477.png)
∴a=
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220531-21614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220531-53341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220531-49027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220530-89989.png)
核心考点
试题【如图,F1,F2是椭圆C1:+y2=1与双曲线C2的公共焦点,A,B分别是C1,C2在第二、四象限的公共点.若四边形AF1BF2为矩形, 则C2的离心率是___】;主要考察你对曲线与方程的应用等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220511-14712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220511-88063.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-51673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-33003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-35850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-33003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-80241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-19501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220513-75259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220513-70630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220513-73918.png)
(1)求椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-33003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-80241.png)
(2)过点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-80241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-19501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220514-28499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220514-93018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220512-33003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220514-40258.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220514-62378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220514-28499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220515-69957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220515-51729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220505-32745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220505-85799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220505-32745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220506-93367.png)
条件 | 方程 |
①![]() | ![]() |
②![]() | ![]() |
③![]() ![]() | ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220506-93367.png)
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-88552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-91006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-95453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-95453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-91006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-88552.png)
C.
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-91006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-88552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-95453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-88552.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-95453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220507-91006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220451-98910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220452-34684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220452-20677.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220452-92235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220452-32200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220452-92235.png)
(2)设过定点
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220453-52341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220453-36899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220453-47329.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220453-84248.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220454-33429.png)
中
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220454-28581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220453-36899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220454-40655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220438-70281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220438-95386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220438-84467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220438-63528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220438-98405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220439-59776.png)
(1)求m的值;
(2)O为坐标原点,若
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220439-88684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220439-79228.png)
(3)在(2)的条件下,设椭圆
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220439-79228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220439-17601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220440-38525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191025/20191025220440-38186.png)
(1)求椭圆C的方程;
(2)是否存在平行于OA的直线l,使得直线l与椭圆C有公共点,且直线OA与l的距离等于4?若存在,求出直线l的方程;若不存在,请说明理由.
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