已知椭圆
上的点
到左右两个焦点
,
的距离之和等于4.
(1)求椭圆C的方程;
(2)设过原点O且与坐标轴不垂直的直线n交椭圆C于M,N两点,点
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d38c670ff6957144c4a8d2550065c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
(1)求椭圆C的方程;
(2)设过原点O且与坐标轴不垂直的直线n交椭圆C于M,N两点,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e9a62ad651d31cd5e7fec2c9d42b282.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d0469336f71edd52dc9148c67db052.png)
更新时间:2021-07-30 13:08:22
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解答题-证明题
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【推荐1】已知点
、
分别是椭圆C的左、右焦点,离心率为
,点P是以坐标原点O为圆心的单位圆上的一点,且
.
(1)求椭圆C的标准方程;
(2)设斜率为k的直线l(不过焦点)交椭圆于M,N两点,若x轴上任意一点到直线
与
的距离均相等,求证:直线l恒过定点,并求出该定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4170cdf9725650e61d4b79daa3a40088.png)
(1)求椭圆C的标准方程;
(2)设斜率为k的直线l(不过焦点)交椭圆于M,N两点,若x轴上任意一点到直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b67528f875a6d4bac8bbf784f7b66a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90a03b11a51bd7824aa4094526e5aec.png)
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【推荐2】已知椭圆
的长轴长是短轴长的
倍,且过点
.
![](https://img.xkw.com/dksih/QBM/2018/1/4/1853043816693760/1854409555615744/STEM/ddb0cf7ff6a04f7f84153aff2611e1ea.png?resizew=241)
(1)求椭圆的标准方程;
(2)若
的顶点
、
在椭圆上,
所在的直线斜率为
,
所在的直线斜率为
,若
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e501efaf72113fc8ee3d495004fa980.png)
![](https://img.xkw.com/dksih/QBM/2018/1/4/1853043816693760/1854409555615744/STEM/ddb0cf7ff6a04f7f84153aff2611e1ea.png?resizew=241)
(1)求椭圆的标准方程;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b8189f7b0ffe4d20bf0fad43b4ed589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658aa70a197c830aa765f2f7ea4c86c5.png)
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【推荐1】已知椭圆C:
过点
,
.
(1)求椭圆C的标准方程;
(2)若斜率为
的直线l与椭圆C交于A,B两点,且
,
,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3be3354fbc3aecfdd295aee9b9c56191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75b9e44c82ab1474aed9aa566c5e3286.png)
(1)求椭圆C的标准方程;
(2)若斜率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b572cbfe5491fabd42a5fdd4038a50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d66733b5ad0fac28d665019b18280615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78d3582498d9a8ebfba39acf60d54662.png)
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【推荐2】已知椭圆
过点
,且焦距为
.
(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
,求直线PA的斜率.
![](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1】已知椭圆
的左、右焦点分别为
、
,长轴的一个端点与短轴两个端点组成等边三角形的三个顶点,直线l经过点
,倾斜角为45°,与椭圆交于A、B两点.
(1)若
,求椭圆方程;
(2)对(1)中椭圆,求
的面积;
(3)M是椭圆上任意一点,若存在实数
,
,使得
,试确定
,
满足的等式关系.
![](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/a3fb78c5f885034612c0e030b920143d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69b1a324748fa3786fa709db3b008e6d.png)
(2)对(1)中椭圆,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c07ebcbfacda073208d483c58e8a84.png)
(3)M是椭圆上任意一点,若存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99dfd10c7047fad7f794684179eaf357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
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【推荐2】已知椭圆
的左右顶点分别为
,经过左焦点的直线
与椭圆交于
两点,记
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e14981af432ea990d8b0e236c69e63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59c4295f918205f5598ecc9a96d8867.png)
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【推荐1】已知O为坐标系原点,椭圆
的右焦点为点F,右准线为直线n.
(1)过点
的直线交椭圆C于
两个不同点,且以线段
为直径的圆经过原点O,求该直线的方程;
(2)已知直线l上有且只有一个点到F的距离与到直线n的距离之比为
.直线l与直线n交于点N,过F作x轴的垂线,交直线l于点M.求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89ecad87737153d4773746f88d508075.png)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)已知直线l上有且只有一个点到F的距离与到直线n的距离之比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7ff4c8dc73f97611be4a9eda1602e7.png)
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【推荐2】已知椭圆E:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
的离心率
,并且经过定点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306e0d78368fdabddeab65f7d246c454.png)
(1)求椭圆E的方程;
(2)问是否存在直线
,使直线与椭圆交于A,B两点,满足
若存在求m值,若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f82eb4ba631d0f50d848aa6e576b379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de85df85401e7e8da683ea4a784963c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/306e0d78368fdabddeab65f7d246c454.png)
(1)求椭圆E的方程;
(2)问是否存在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b74381f68eb1e33d412a7a3d62313f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
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