已知中心为原点O,焦点在x轴上的椭圆C的离心率为
,且椭圆C的长轴是圆
的一条直径.
(1)求椭圆C的方程;
(2)若不过原点的直线l与椭圆C交于A,B两点,与圆M交于P、Q两点,且直线OA,AB,OB的斜率成等比数列,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5240a75b910e7d57c991cd574ee896e3.png)
(1)求椭圆C的方程;
(2)若不过原点的直线l与椭圆C交于A,B两点,与圆M交于P、Q两点,且直线OA,AB,OB的斜率成等比数列,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76b1113864968119e61aeee9ba9c613b.png)
更新时间:2020-02-16 14:55:54
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【推荐1】已知椭圆C:
的离心率为
,
,
分别为椭圆C的左、右焦点,过
且与x轴垂直的直线与椭圆C交于点A,B,且
的面积为
.
(1)求椭圆C的标准方程;
(2)设直线l与椭圆C交于不同于右顶点P的M,N两点,且
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.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/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5eb2485f90dbfd0dfd6e7d179a856f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(1)求椭圆C的标准方程;
(2)设直线l与椭圆C交于不同于右顶点P的M,N两点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3835e6398d18d162afebc92cd2ae9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79188647c574441c2414c3781a0ef543.png)
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【推荐2】已知椭圆
的离心率为
;
是
的左焦点,直线
与
相交于
,
两点,直线
与
的另一交点为
,直线
与
的另一交点为
.当
时,
的面积为3.
(1)求
的方程;
(2)证明:直线
经过定点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04add41d4f548a8cca7e06703c8f2d64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae6883ecce3bdd570260fb0b52fa7a0.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd876a2ed79c64bacc3e64b8ee92735e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a373beeede5bff441694e824c8f93629.png)
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【推荐1】已知椭圆
过点
,A、B为左右顶点,且
.
(1)求椭圆C的方程;
(2)过点A作椭圆内的圆
的两条切线,交椭圆于C、D两点,若直线CD与圆O相切,求圆O的方程;
(3)过点P作(2)中圆O的两条切线,分别交椭圆于两点Q、R,求证:直线QR与圆O相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3c639884f0ea1fe96c254e452d9420.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
(1)求椭圆C的方程;
(2)过点A作椭圆内的圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7121bfdb53eb8307706e8c63c4569b1d.png)
(3)过点P作(2)中圆O的两条切线,分别交椭圆于两点Q、R,求证:直线QR与圆O相切.
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【推荐2】已知椭圆
,过点
,
的直线倾斜角为
,原点到该直线的距离为
.
(Ⅰ)求椭圆的标准方程;
(Ⅱ)斜率大于零的直线过
与椭圆交于E,F两点,若
,求直线EF的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83770dfcae8b8e1288aa85d50a63d0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9199b50dd0036be9b764c621d1d46f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
(Ⅰ)求椭圆的标准方程;
(Ⅱ)斜率大于零的直线过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ff329f3b12cf5678e99941e7188621.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/571b8177177b21d405d0cbc162bf9c2a.png)
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