已知椭圆
的左焦点为
,过点
作一条斜率大于0的直线
与
交于不同的两点
、
,延长
交
于点
.
(1)求椭圆
的离心率;
(2)求证:点
与点
关于
轴对称.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b13256966871698280885966815b92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7637849048e371f7f7254544ef745623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79dbefeef8b858149bc3dcf7b2ebb133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
(2)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2016-12-03 10:14:46
|
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解题方法
【推荐1】如图,已知抛物线
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的右焦点,且两曲线的公共点为A,B,且AB的连线过焦点F,求椭圆的离心率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8be8225d7dab47575eda7972d166ad48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
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【推荐2】已知椭圆
的左、右焦点分别为
.
(1)若点
在椭圆上,点
,求椭圆的标准方程;
(2)已知点P在椭圆上,且
,
,求椭圆的离心率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e67baac84cf5c95d06d50c36cab7c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e9d55173f26afdf0e37462b556a605.png)
(2)已知点P在椭圆上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc53626a063385af344e087a3307c0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/898717d76c4cc50ad4cda6ef51d11f7f.png)
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【推荐1】已知椭圆
的离心率为
,过顶点
的直线
与椭圆
相交于两点
.
(1)求椭圆
的方程;
(2)若点
在椭圆上且满足
,求直线
的斜率
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a2b8b43e1fe82fc439d145e91b860c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff01fe4e8f176ac1ec86f5218ab53af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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【推荐2】已知椭圆C:
(a>b>0)的左右焦点分别为F1(-c,0)和F2(c,0),上顶点为M,且△MF1F2为等边三角形,点M到左右顶点的距离之和为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/a2fcba21-0725-470a-8c9a-3c116b953510.png?resizew=270)
(1)求椭圆C的标准方程;
(2)过点F1的直线l交椭圆C于A,B两点,若以AB为直径的圆经过点F2,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff61fe9d4e93d7cc338489d1c99c40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/a2fcba21-0725-470a-8c9a-3c116b953510.png?resizew=270)
(1)求椭圆C的标准方程;
(2)过点F1的直线l交椭圆C于A,B两点,若以AB为直径的圆经过点F2,求直线l的方程.
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