已知椭圆
,离心率
,且过点
.
(1)求椭圆C的方程;
(2)若直线x=1上有一点P,且与x轴交于Q点,过Q的直线l交椭圆C于A,B两点,交直线x=3于M点,是否存在实数
,使得
恒成立?若存在,求出实数
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef6b94e42869013745050aba059b58dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de85df85401e7e8da683ea4a784963c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/371e3151e76c4ab9c9a6eff1c7ad88cc.png)
(1)求椭圆C的方程;
(2)若直线x=1上有一点P,且与x轴交于Q点,过Q的直线l交椭圆C于A,B两点,交直线x=3于M点,是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8571a99ed9ea7aaa12cab4068f762656.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
更新时间:2021-05-11 16:44:18
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相似题推荐
解答题-问答题
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解题方法
【推荐1】如图定义:以椭圆中心为圆心,长轴为直径的圆叫做椭圆的“伴随圆”,过椭圆上一点
作
轴的垂线交其“伴随圆”于点
(
、
在同一象限内),称点
为点
的“伴随点”.已知椭圆
上的点
的“伴随点”为
.
(1)求椭圆
及其“伴随圆”的方程;
(2)求
的最大值,并求此时“伴随点”
的坐标;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1721aa6b62fc4c68cb7161f2658117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0471cd3dccabaef113cd5761544d7c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/7/9e55c25f-90b9-4851-a963-3327b1d00461.png?resizew=176)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f24f3e88ab6fbdd293de0730616fa63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐2】已知椭圆
的左焦点
,点
在椭圆C上.
(1)求椭圆C的标准方程;
(2)经过圆
上一动点P作椭圆C的两条切线,切点分别记为A,B,直线
分别与圆O相交于异于点P的M,N两点.
(ⅰ)当直线
的斜率都存在时,记直线
的斜率分别
.求证:
;
(ⅱ)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee9d4ad39e56940f519bd3acc5e85ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad150c23f6f98db8091407714478633c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8504c0d2fc18ed49ba592cf6890fef.png)
(1)求椭圆C的标准方程;
(2)经过圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eafe0d608cdbc8d2b09a6e790546a3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
(ⅰ)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c407500c3f3d395fdfdc366851ef3fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4cc51d393a94365f7008de5eae8879.png)
(ⅱ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2135ff2675324de8a374aadca74e869f.png)
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【推荐1】已知椭圆
的离心率为
,且经过点P
,过它的左、右焦点
分别作直线l1和12.l1交椭圆于A.两点,l2交椭圆于C,D两点, 且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/87b0265f-cd8a-4913-9412-7bc13767d4cc.png?resizew=203)
(1)求椭圆的标准方程.
(2)求四边形ACBD的面积S的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2de52259b426acb42761fec59a7748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce08b357f11ef44c3e8207ac574422a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/87b0265f-cd8a-4913-9412-7bc13767d4cc.png?resizew=203)
(1)求椭圆的标准方程.
(2)求四边形ACBD的面积S的取值范围.
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解题方法
【推荐2】已知椭圆
过点
,且离心率为
.
(1)求椭圆
的方程;
(2)设直线
与椭圆
交于
、
两点,以
为对角线作正方形
,记直线
与
轴的交点为
,问
、
两点间距离是否为定值?如果是,求出定值;如果不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0a06f1803631b0b3112ec57ca44a70.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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【推荐1】在平面直角坐标系
中,已知椭圆
的左、右焦点分别为
,圆
:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/74260431-1700-4bc3-a5d9-d89ff2bf4088.png?resizew=200)
(1)设
为圆
上一点,满足
,求点
的坐标;
(2)若
为椭圆上任意一点,以
为圆心,
为半径的圆
与圆
的公共弦为
,证明:点
到直线
的距离
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c82e7d9f4f7ace849e09e9adcb786b7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7311eb8b2dd3269d4837f6f11e8c625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a010d6d95e2d648831d0893f7264e59f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/74260431-1700-4bc3-a5d9-d89ff2bf4088.png?resizew=200)
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d4a3807da63d52042babc2e18b26f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e4b0ddfa5aec71d6df83e574b56150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e4b0ddfa5aec71d6df83e574b56150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
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【推荐2】如图,已知椭圆
的右焦点为
,上顶点为
,右顶点为
.
(1)求椭圆C的标准方程;
(2)若点P是椭圆C上异于
的一点,且直线PA、PB分别与y轴和x轴交于点
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60cfc83cab6cd17842f28b9c37836673.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b54b9cf95418bc3dce6e4c698b9907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/249d45f6-2bb7-4cf4-866b-2a39a7986b5f.png?resizew=252)
(1)求椭圆C的标准方程;
(2)若点P是椭圆C上异于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf904bf6e732f418ad172ce21688f626.png)
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