已知右焦点为F的椭圆E:
上的三点A,B,C满足直线AB过坐标原点,若
于点F,且
,则E的离心率是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2a245381e615882ee5feb7793a1df6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdd2fe43cba206f61561a8f92fe53dd9.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-01-06 22:14:40
|
【知识点】 求椭圆的离心率或离心率的取值范围
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【推荐1】双曲线的顶点与焦点分别是椭圆
的焦点与顶点,若双曲线的两条渐近线与椭圆的交点构成的四边形恰为正方形,则椭圆离心率为( )
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】我们通常称离心率是
的椭圆为“黄金椭圆”.如图,已知椭圆
,
,
,
,
分别为左、右、上、下顶点,
,
分别为左、右焦点,
为椭圆上一点,下列条件中能使椭圆
为“黄金椭圆”的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/a45bdde7-795b-4b81-8134-001b5678d77f.png?resizew=209)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
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![](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/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/a45bdde7-795b-4b81-8134-001b5678d77f.png?resizew=209)
A.![]() | B.![]() |
C.![]() ![]() | D.四边形![]() ![]() |
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