解题方法
1 . 已知椭圆
的左焦点为
,
轴上的点
在椭圆外,且线段
与椭圆
交于点
,若
,
(其中
为坐标原点),则椭圆
的离心率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0377a8ae8695901374ab0c733f1927ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba17bb8bc41bd3c66b392f2f60bcfc77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 已知直线
经过椭圆E:
(
)的左焦点和下顶点,原点
到直线
的距离为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/20fd98e0-229f-4a22-8dc7-0cb5c4e5b5f4.png?resizew=168)
(1)求椭圆
的离心率;
(2)如上图,
是圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a463744f6f85de0ff99bc2e3073b9e23.png)
的一条直径,若椭圆
经过
,
两点,求椭圆
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.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/0783504b77ca62498b37d9bde98d5d34.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/20fd98e0-229f-4a22-8dc7-0cb5c4e5b5f4.png?resizew=168)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)如上图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a463744f6f85de0ff99bc2e3073b9e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e771212eddd31a7c33c284f65caf656.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
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3 . 已知抛物线x2=4y的焦点F是椭圆
1(a>b>0)的一个焦点,且该抛物线的准线与椭圆相交于A、B两点,若△FAB是等边三角形,则此椭圆的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd39bc7983438f995cf3fee75fc84730.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
4 . 已知椭圆
的左右焦点分别为
,
为过
的直线与椭圆
的交点,且
为正三角形,则该椭圆的离心率为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35eb8a895a6122917c531afea1a83284.png)
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2020-03-20更新
|
543次组卷
|
5卷引用:广西梧州市2019-2020学年度高二上学期期末质量检测数学理科试题
名校
解题方法
5 . 已知点
为椭圆
:
的下顶点,
在椭圆上,若四边形
为平行四边形,
为直线
的倾斜角,且
,则椭圆
的离心率的取值范围为( )
![](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/4971193daa643eb7bea75c9e7f63b7b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23db8006041961bfbeab653a9c8e2325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e85cff16604de8135e762099a0a8f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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2020-03-20更新
|
1051次组卷
|
4卷引用:吉林省长春市绿园区长春兴华高中2019-2020学年高二上学期期末数学(理)试题
解题方法
6 . 过椭圆E:
1(a>b>0)上一动点P向圆O:x2+y2=b2引两条切线PA,PB,切点分别是A,B.直线AB分别与x轴,y轴交于点M,N(O为坐标原点).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/f0867035-2ee9-496d-9ee7-c91b715f85bb.png?resizew=220)
(1)若在椭圆E上存在点P,满足PA⊥PB,求椭圆E的离心率的取值范围;
(2)求证:在椭圆E内,存在一点C满足|CO|=|CA|=|CP|=|CB|;
(3)若椭圆E的短轴长为2,△MON面积的最小值为
,求椭圆E的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd4fd9bfd38c5361d55735bfe4bb2d8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/f0867035-2ee9-496d-9ee7-c91b715f85bb.png?resizew=220)
(1)若在椭圆E上存在点P,满足PA⊥PB,求椭圆E的离心率的取值范围;
(2)求证:在椭圆E内,存在一点C满足|CO|=|CA|=|CP|=|CB|;
(3)若椭圆E的短轴长为2,△MON面积的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
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解题方法
7 . 在直角坐标系中,已知椭圆
经过点
,且其左右焦点的坐标分别是
,
.
(1)求椭圆
的离心率及标准方程;
(2)设
为动点,其中
,直线
经过点
且与椭圆
相交于
,
两点,若
为
的中点,是否存在定点
,使
恒成立?若存在,求点
的坐标;若不存在,说明理由
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cac72ae550626c8583e4466b8b33d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcbcd0aebdd8bd688d108834747009f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88c3a2f5b0702ea9fbb9dc8904579737.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/159cee4c6a18163601ff249fafde685d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d016c583f88a262712025dcda7721980.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c65d33a5a770f391d62f6ade800287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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名校
解题方法
8 . 已知椭圆
的两个焦点为
,
为椭圆上一点,
.若
的内切圆面积为
,则椭圆的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f9bdc6d9f09e14b037ea7d3ee1f623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9df1061c3ba5151ba2f7359acaf356.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d99e0edef2a8bcf4a44a025f6b2c705.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-03-16更新
|
1052次组卷
|
3卷引用:2020届云南省陆良县高三毕业班第二次教学质量摸底考试数学(理)试题
9 . 椭圆C:
(
)的左、右焦点分别是
、
,离心率为
,过
且垂直于轴的直线被椭圆C截得的线段长为3.
(1)求椭圆C的方程;
(2)点P是椭圆C上除长轴端点外的任一点,连接
、
,设
的角平分线PM交C的长轴于点
,求m的取值范围;
(3)在(2)的条件下,过点P作斜率为k的直线l,使得l与椭圆C有且只有一个公共点设直线
、
的斜率分别为
、
,若
,试证明
为定值,并求出这个定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.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/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
(1)求椭圆C的方程;
(2)点P是椭圆C上除长轴端点外的任一点,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0739793f234f8e86adc6177801ae7295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94fe48bf7af022ecbbe13833fdcc2c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62769b7177ef4bc952dc1dd51d6b510.png)
(3)在(2)的条件下,过点P作斜率为k的直线l,使得l与椭圆C有且只有一个公共点设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0739793f234f8e86adc6177801ae7295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fe8d1be8a033e33fcc111cdbcf7b04.png)
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名校
解题方法
10 . 已知
是椭圆
:
的右焦点,点
在椭圆
上,线段
与圆
相切于点
,且
,则椭圆
的离心率等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.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/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be99bf4c4fa9c8a20f2ee297ad45598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32998aad8eeae5d7733521402f434f2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-03-04更新
|
920次组卷
|
3卷引用:江西省景德镇市2019-2020学年高二上学期期末检测数学理科试题