已知椭圆
的左、右顶点分别为
,左焦点为
,过点
作x轴的垂线与T在第二象限的交点为
的面积为
,且
.
(1)求T的方程;
(2)已知点P为直线
上一动点,过点P向T作两条切线,切点分别为
.求证:直线
恒过一定点Q,并求出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b76e364a93cd78537c6c97b88021f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6dc791ae552024ea0df7905bf190f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e656094e595e09970fa93e8d9fa0f35d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f5a566e9905ebdca5e064e1dc7d5e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0dc29763f8e201ae13e6dc4f0f190ce.png)
(1)求T的方程;
(2)已知点P为直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88847a87bd1b93d0f808316e199e821f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac699e41d97634f5a4366860dc61559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96ebb3eb6f2b5bed1f3e24e9fc079934.png)
更新时间:2024-03-12 20:41:08
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【推荐1】已知椭圆
,四点
,
,
,
中恰有三个点在椭圆
上,左、右焦点分别为
、
.
(1)求椭圆
的方程;
(2)过左焦点
且不与坐标轴平行的直线
交椭圆于
、
两点,若线段
的垂直平分线交
轴于点
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffb8bb7f23fbde7072e4a2eb47151c75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/508216047373cee710a5060119c58b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497bddc11cf553e6511c0a4e91786b6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/401f8dd7e92326fa38552e3fc08d7d0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过左焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a78452f2a21653ce4a6edfd2fbcde5b3.png)
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【推荐2】如图,已知椭圆C:
的左、右顶点分别为A1,A2,左右焦点分别为F1,F2,离心率为
,|F1F2|=
,O为坐标原点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/6f690351-d42c-4945-8a90-9f62042d204f.png?resizew=280)
(1)求椭圆C的方程;
(2)设过点P(4,m)的直线PA1,PA2与椭圆分别交于点M,N,其中m>0,求
的面积S的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/6f690351-d42c-4945-8a90-9f62042d204f.png?resizew=280)
(1)求椭圆C的方程;
(2)设过点P(4,m)的直线PA1,PA2与椭圆分别交于点M,N,其中m>0,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800eca4e8d1c3f4792a1d3aba6f3b481.png)
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【推荐1】已知椭圆
的离心率为
,且经过点
.
(1)求椭圆
的方程及其长轴长;
(2)
,
分别为椭圆
的左、右顶点,点
在椭圆
上,且位于
轴下方,直线
交
轴于点
,若
的面积比
的面积大
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014b99f5c93a4ce8cd6251c12c1d1b37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbbb783caee63d1f55131fb1d5a1e99.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
(2)
![](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/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a1eda00fc2d64ce3a42004b24adf00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab142c659d5434d88d7f6f5d994cfd18.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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【推荐2】如图,已知椭圆
,左、右焦点分别为
,
,右顶点为
,上顶点为
,
为椭圆上在第一象限内一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/aac8755e-159d-42c3-bd4d-d76b062d7f2a.png?resizew=230)
(1)若
.
①求椭圆的离心率
;
②求直线
的斜率.
(2)若
,
,
成等差数列,且
,求直线
的斜率的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/aac8755e-159d-42c3-bd4d-d76b062d7f2a.png?resizew=230)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d87fd50f35d766279f41384c7bb81d.png)
①求椭圆的离心率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
②求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1b3a51deb7af25837ccefcf10eb1262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a87481122e5e2714e1e25f85e248a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbac9a87d39df24f7b357890b532718b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39bf40fe48f416db0e0f215ce7cd5286.png)
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【推荐1】已知椭圆
的左焦点F为
,过椭圆左顶点和上顶点的直线的斜率为
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(1)求椭圆E的方程;
(2)若
为平面上一点,C,D分别为椭圆的上、下顶点,直线NC,ND与椭圆的另一个交点分别为P,Q.试判断点F到直线PQ的距离是否存在最大值?如果存在,求出最大值;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a200ca2c4af794f4d1c6a5443830b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ca5ff6d957b3f6bfb307e517c8e1ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(1)求椭圆E的方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc68dd3bd6844cc351971c894d5ca159.png)
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【推荐2】已知椭圆
的右焦点为F,过F作一条直线交C于R,S两点,线段RS长度的最小值为3,C的离心率为
.
(1)求C的方程;
(2)不过C的左顶点A的直线l与C相交于P,Q两点,且直线AP与AQ的斜率之积恰好等于
.试问直线l是否过定点?若过定点,求出该定点的坐标;若不过定点,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(1)求C的方程;
(2)不过C的左顶点A的直线l与C相交于P,Q两点,且直线AP与AQ的斜率之积恰好等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
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