已知椭圆
的离心率为
,直线
,左焦点F到直线l的距离为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/3cfc814f-70b4-4177-9378-7b0a17a73d7b.png?resizew=181)
(1)求椭圆
的标准方程;
(2)直线
与椭圆
相交于A,B两点.C,D是椭圆T上异于A,B的任意两点,且直线AC,BC,AD,BD的斜率都存在.直线AC,BD相交于点M,直线AD,BC相交于点N.设直线AC,BC的斜率为
,
.
①求
的值;
②求直线MN的斜率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5823fae7fe93cb9e1757b1216cf89b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfea30b3df4214f447aaeacbf558aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7258cbc35df82eb43ee42a739caaee17.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/3cfc814f-70b4-4177-9378-7b0a17a73d7b.png?resizew=181)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bfea30b3df4214f447aaeacbf558aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b881044b5c73db6fcce110525741b02.png)
②求直线MN的斜率.
更新时间:2023-04-24 22:14:46
|
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解答题-问答题
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适中
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解题方法
【推荐1】已知椭圆
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(1)求椭圆C的方程;
(2)不经过点P的直线l与椭圆C交于A,B两点,直线PA,PB的斜率之积为6.若l的斜率为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef404abca1f78da130a38849f58559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9b5e076078240e0c5ad9763a9824d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
(1)求椭圆C的方程;
(2)不经过点P的直线l与椭圆C交于A,B两点,直线PA,PB的斜率之积为6.若l的斜率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a2008b78a906cf5ecdfd68432fa9ad1.png)
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【推荐2】已知椭圆
以抛物线
的焦点为顶点,且离心率为
.
(1)求椭圆
的方程;
(2)若直线
与椭圆
相交于
、
两点,与直线
相交于
点,
是椭圆
上一点且满足
(其中
为坐标原点),试问在
轴上是否存在一点
,使得
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的坐标及
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(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc5bd66dd6d5e09ff0893a938aed56e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/a089c207e39a24d0d82aa853ac2bbb8c.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8f74d548a017d78542283f4c91b93f.png)
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解答题-问答题
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适中
(0.65)
解题方法
【推荐1】已知椭圆
:
的左、右顶点分别为
和
,点
是椭圆上与
、
不重合的动点,且
、
的斜率之积为
.
(1)求椭圆
的标准方程;
(2)若点
为椭圆
的右焦点,点
为直线
上的一动点,线段
与椭圆
交于点
,线段
的反向延长线与椭圆
交于点
,证明:
、
、
三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c1fb9f8b59508b1b58180c899d1787.png)
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![](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/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
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解答题-证明题
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适中
(0.65)
解题方法
【推荐2】在平面直角坐标系
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分别作斜率为
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(1)求曲线
的方程;
(2)过点
的两条直线分别交曲线
于点
和
,且
,求证直线
的斜率为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad57e3727b7bbd795b05332fbf9649e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13171541edecf3480703d0f9d44abf76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad57e3727b7bbd795b05332fbf9649e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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