焦点在x轴上的椭圆
的离心率e=
,F,A分别是椭圆的左焦点和右顶点,P是椭圆上任意一点,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/605bb9d668eb75d1f4a189864a61da44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b91ceb49b1438ae842df61259d0011e.png)
A.4 | B.6 | C.8 | D.10 |
更新时间:2019-12-02 21:16:40
|
【知识点】 求椭圆中的最值问题
相似题推荐
单选题
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适中
(0.65)
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解题方法
【推荐1】已知椭圆
的左、右焦点分别为
为椭圆上一动点,
面积的最大值为
,则椭圆的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35e896097c0880fab948f0103b841451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d9f92759e99ee8d17c59553517a0ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9de62bbd179c7cbd2540ec783685d934.png)
A.![]() | B.1 | C.![]() | D.![]() |
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单选题
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适中
(0.65)
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解题方法
【推荐2】已知椭圆C:
的左、右焦点分别为
,
,圆
:
,点P和点B分别为椭圆C和圆A上的动点,当
取最小值3时,
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe026d443e9f2a659b182671ee776f23.png)
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e265ce107592c375b78007107a9c00a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/244d2b740bee1996618b0306c292995f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
A.![]() | B.![]() | C.2 | D.![]() |
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