如图,C、D是离心率为
的椭圆的左、右顶点,
、
是该椭圆的左、右焦点, A、B是直线
4上两个动点,连接AD和BD,它们分别与椭圆交于点E、F两点,且线段EF恰好过椭圆的左焦点
. 当
时,点E恰为线段AD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/3cc52428-b954-4e33-9d58-7f9fc38507a9.png?resizew=228)
(Ⅰ)求椭圆的方程;
(Ⅱ)求证:以AB为直径的圆始终与直线EF相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.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/97b51bfc2ab3e49ad30b5ee2d57f13be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6cc3789c0e9b7d1226aa0de3327599.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/6/3cc52428-b954-4e33-9d58-7f9fc38507a9.png?resizew=228)
(Ⅰ)求椭圆的方程;
(Ⅱ)求证:以AB为直径的圆始终与直线EF相切.
更新时间:2019-02-12 22:18:58
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【推荐1】已知椭圆
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【推荐2】已知椭圆
的离心率是
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的方程;
(2)求
面积的最大值(其中
为坐标原点).
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作与直线
不重合的直线
与
相交于
两点,若直线
和直线
相交于点
,求证:点
在定直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
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【推荐2】已知椭圆
的左顶点
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(1)求椭圆L的标准方程;
(2)若直线AD,BC的斜率相等,证明:点P在一条定直线上运动.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc0aa884c481b25361aa28952f95db5e.png)
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