已知椭圆
的长轴为
,
为椭圆的下顶点,设直线
的斜率分别为
,且
,则该椭圆的离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c9c07a8c31a70dedba18b787030851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/345ec30e82175cbc21700f798ad47117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93f61e0c3fb8649d51ffcb23d297a85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151e09f3a383d7811c619eef3a6398cf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2019-04-10 20:33:03
|
【知识点】 求椭圆的离心率或离心率的取值范围
相似题推荐
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】已知椭圆
与双曲线
有相同的焦点,则椭圆的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/981472c23acd32eaf33a2c69cd220735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】已知
,
是椭圆和双曲线的公共焦点,P是它们一个公共点,设椭圆和双曲线的离心率分别为
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33558881906c228c262ff8024dcfc4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33a99190a8fd29c36d5a002e3197cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f3025990eefb5f17ff24721438aa0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c406c942d1cf93b68e69842743520578.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次