1 . 椭圆
,
为椭圆的左、右焦点,
为坐标原点,点
为椭圆上一点,
,且
成等比数列,则椭圆的离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00df4f17848c072b51e80d427d486e31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882651b776851f3f0665de12da6ed47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1fbe9c1be62cb2d5d775e32b815ca3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c275197cbbde1e881c2ca75d02cc09.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2017-03-02更新
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3卷引用:2017届云南省云南师范大学附属中学高三高考适应性月考(五)文数试卷