已知椭圆
的两个焦点分别为
,且椭圆
过点
.
(1)求椭圆
的标准方程;
(2)过点
作直线
交椭圆于
两点,
是弦
的中点,求直线
的方程及弦
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3eae4a1759f0b520d1ae61f21d381f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf6c5aa505dbec250115579c85a0296.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0156cf67b5daaf80e42d1776166737af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
更新时间:2023-02-25 13:20:57
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【推荐1】如图,在平面直角坐标系
中,椭圆C过点
,焦点
,
,圆O的直径为
.
![](https://img.xkw.com/dksih/QBM/2020/11/11/2590894434803712/2592708726022144/STEM/e48d27eb28154655953e20399c611571.png?resizew=206)
(1)求椭圆C及圆O的方程;
(2)设直线l与圆O相切于第一象限内的点P.
①若直线l与椭圆C有且只有一个公共点,求点P的坐标;
②直线l与椭圆C交于A,B两点.若
,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47a3bb236e2f286a60b3148771635f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60be7717fcbbfe67dee29e8174a8e049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f2eca80989a7f19baf95535091a0e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643ef7d761de0e794fc39937dc72ac6a.png)
![](https://img.xkw.com/dksih/QBM/2020/11/11/2590894434803712/2592708726022144/STEM/e48d27eb28154655953e20399c611571.png?resizew=206)
(1)求椭圆C及圆O的方程;
(2)设直线l与圆O相切于第一象限内的点P.
①若直线l与椭圆C有且只有一个公共点,求点P的坐标;
②直线l与椭圆C交于A,B两点.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dc974ad97512909b006f98f72e8a260.png)
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【推荐2】已知椭圆
的左右焦点分别是
和
,离心率为
,以
在椭圆
上,且
的面积的最大值为
.
(1)求椭圆
的方程;
(2)已知直线
与椭圆
交于不同的两点
,若
轴上存在点
,使得
,求点
的横坐标的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28eda154c86efb1008eb9459e7ae82ae.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/3f1dd362f843e640ce551ad1787c9873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50504400cefbe49b3d2b7562e47b6dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4b5a2ccac15d3015249bd19a1876f1.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bab97c929b0079d4d62d52ef10e6445a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900343696be71355118df45cf87b3ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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【推荐1】已知椭圆
的左焦点为
,离心率为
,点
是椭圆
上一点.
(1)求椭圆
的标准方程;
(2)若
为椭圆
上不同于
的两点,且直线
关于直线
对称,求证:直线
的斜率为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af292f60c635d2bb4c38379c6bd04ac5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d42cb68c5c877a455ba7ac0a6b6a651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐2】椭圆
的右顶点
,过椭圆右焦点的直线l与C交于点M,N,当l垂直于x轴时
.
(1)求椭圆C的方程;
(2)若直线
与y轴交于P点,直线
与y轴交于Q点,点
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a98eaaab44a91d0bad21dbd260be770.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635f9e9f56bc9e8b5d7ffeb922dba97f.png)
(1)求椭圆C的方程;
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc1835455f7f683ebc76b2f0e9cc44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e457b4447d5cf596012e630dd45f16f1.png)
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【推荐1】已知椭圆C:
的左焦点为F,点A在C上,过点A作
轴,垂足为B,其中点B异于点A,且
.
(1)求动点D的轨迹方程;
(2)过点F的直线
与C交于M,N两点,与动点D的轨迹交于P,Q两点,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82e7d9f4f7ace849e09e9adcb786b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057ff6cf0c9c9812ff45ad3a19aee237.png)
(1)求动点D的轨迹方程;
(2)过点F的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16f71c113a73ed4a3a756dcc3705818.png)
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【推荐2】已知直线
所经过的定点
恰好是中心在原点的椭圆C的一个焦点,且椭圆C上的点到点F的最大距离为8.
(Ⅰ)求椭圆C的标准方程;
(Ⅱ)点A的坐标为
,
为椭圆C上任意一点,求
的最大值;
(Ⅲ)已知圆
:
,直线
.试证明当点
在椭圆C上运动时,直线
与圆
恒相交,并求直线
被圆
所截得的弦长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd650c677695f98f4032440a2122e3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(Ⅰ)求椭圆C的标准方程;
(Ⅱ)点A的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f48e1c656aace41360467f254e359d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2faa4304a7b1ff179b7016497b35188.png)
(Ⅲ)已知圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0c0fa62a09c0532bafe39a7c935ca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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