给定椭圆 C : ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
,称圆心在原点,半径为
的圆是椭圆 C 的“伴随圆”.若椭圆 C 的一个焦点为 F1(
, 0) ,其短轴上的一个端点到 F1 的距离为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求椭圆 C 的方程及其“伴随圆”方程;
(2)若倾斜角 45°的直线 l 与椭圆 C 只有一个公共点,且与椭圆 C 的伴随圆相交于 M .N 两点,求弦 MN 的的长;
(3)点 P 是椭圆 C 的伴随圆上一个动点,过点 P 作直线 l1、l2,使得 l1、l2与椭圆 C 都只有一个公共点,判断l1、l2的位置关系,并说明理由.
![](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/da001dad7941e6c9858637d7b62cec59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求椭圆 C 的方程及其“伴随圆”方程;
(2)若倾斜角 45°的直线 l 与椭圆 C 只有一个公共点,且与椭圆 C 的伴随圆相交于 M .N 两点,求弦 MN 的的长;
(3)点 P 是椭圆 C 的伴随圆上一个动点,过点 P 作直线 l1、l2,使得 l1、l2与椭圆 C 都只有一个公共点,判断l1、l2的位置关系,并说明理由.
更新时间:2019-12-08 13:15:21
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【推荐1】如图,在平面直角坐标系
中,已知椭圆
的右焦点为
,下顶点为P,过点
的动直线l交椭圆C于A,B两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/5ea1fa5e-0b6f-434b-8ea2-a46828885c4a.png?resizew=184)
(1)当直线l平行于x轴时,P,F,A三点共线,且
,求椭圆C的方程;
(2)当椭圆C的离心率为何值时,对任意的动直线l,总有
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24550b13dbecf7d86c7054250e987274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716d448b588eeadd3eaaad268d6cd963.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/1/5ea1fa5e-0b6f-434b-8ea2-a46828885c4a.png?resizew=184)
(1)当直线l平行于x轴时,P,F,A三点共线,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a024184ab674fed849ed6986ddb056.png)
(2)当椭圆C的离心率为何值时,对任意的动直线l,总有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83640592853a53872d7af69c0cffc1bb.png)
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【推荐2】已知椭圆C:
的右焦点为F,长轴长为4,离心率为
.过点
的直线与椭圆C交于A,B两点.
(1)求椭圆C的标准方程:
(2)设直线AF,BF的斜率分别为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e0b4cce429003557b051ea0fa2f7de.png)
(1)求椭圆C的标准方程:
(2)设直线AF,BF的斜率分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22b970cbdbe55bfb47a6b64bf767c12d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e3f7ddd51215d00661c09cd900d60.png)
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【推荐1】如图所示,已知椭圆的中心在原点,焦点在
轴上,长轴长是短轴长的3倍且经过点
,平行于
的直线
在
轴上的截距为
,且交椭圆于
两不同点.
(1)求椭圆的方程;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/543d7c6ecbd812e056af069868e97c5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f41b8856f1acaf13e6968f0a96f37795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)求椭圆的方程;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://img.xkw.com/dksih/QBM/2011/5/25/1570222471340032/1570222476640256/STEM/9e4339afc2a9465882690fe9fdd56f15.png?resizew=214)
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【推荐2】已知曲线C:
(m∈R)
(1) 若曲线C是焦点在x轴点上的椭圆,求m的取值范围;
(2) 设m=4,曲线c与y轴的交点为A,B(点A位于点B的上方),直线y=kx+4与曲线c交于不同的两点M、N,直线y=1与直线BM交于点G.求证:A,G,N三点共线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36cd32a789948a37088dff2891a21eff.png)
(1) 若曲线C是焦点在x轴点上的椭圆,求m的取值范围;
(2) 设m=4,曲线c与y轴的交点为A,B(点A位于点B的上方),直线y=kx+4与曲线c交于不同的两点M、N,直线y=1与直线BM交于点G.求证:A,G,N三点共线.
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【推荐1】已知椭圆
:
的离心率为
,
,
分别为椭圆
的左,右焦点,
为椭圆
上一点,
的周长为
.
(1)求椭圆
的方程;
(2)
为圆
上任意一点,过
作椭圆
的两条切线,切点分别为A,B,判断
是否为定值?若是,求出定值:若不是,说明理由,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb8fb6f3d7540831a9e97d3b184a491.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d35465f3e40ce00a1dce54b943ae183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33e5d0dbdd0f15854f0d7dd8b53058.png)
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【推荐2】已知椭圆的上顶点为
,点
在圆
上运动,且
的最大值为
.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bd685943cf39f7945b31e42d6221788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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