过椭圆
一个焦点且垂直于
轴的直线与椭圆交于
两点,
是原点,若
是等边三角形,则椭圆的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
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更新时间:2020-04-12 22:14:58
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【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)
解题方法
【推荐1】已知
分别是椭圆
的左、右焦点,点
是椭圆上一点,
为
的内心,若
,则该椭圆的离心率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9125cf40f225e6ec6342ca327597871.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9df1061c3ba5151ba2f7359acaf356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae711d0d940ca5da963f606c233d27b.png)
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您最近一年使用:0次
单选题
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适中
(0.65)
名校
【推荐2】椭圆的焦点为
,过点
作直线与椭圆相交,被椭圆截得的最短的弦
长为
,
的周长为20,则椭圆的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb4c79d43649223663ba1806fdea942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05dd2814ffec1f71ea78a7f935dd9595.png)
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您最近一年使用:0次