解题方法
1 . 第24届冬季奥林匹克运动会,将于2022年2月4日在北京市和张家口市联合举行.北京将成为奥运史上第一个举办过夏季奥林匹克运动会和冬季奥林匹克运动会的城市.根据安排,国家体育场(鸟巢)成为北京冬奥会开、闭幕式的场馆.国家体育场“鸟巢”的钢结构鸟瞰图如图所示,内外两圈的钢骨架是两个“相似椭圆”(离心率相同的两个椭圆我们称为“相似椭圆”).如图,由外层椭圆长轴一端点A和短轴一端点B分别向内层椭圆引切线AC,BD,若两切线斜率之积等于
,则椭圆的离心率为( )
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899126226354176/2915735481475072/STEM/ff1eea31-bde2-4827-b4d8-5ca89fd277ac.png?resizew=528)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78fd95f89dec2d373fa57f02acd739f.png)
![](https://img.xkw.com/dksih/QBM/2022/1/21/2899126226354176/2915735481475072/STEM/ff1eea31-bde2-4827-b4d8-5ca89fd277ac.png?resizew=528)
A.![]() | B.![]() | C.![]() | D.![]() |
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2022-02-13更新
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2卷引用:浙江省温州市瑞安市第六中学2021-2022学年高二下学期入学检测数学试题 .
2 . 已知椭圆
的右焦点为
,上顶点为
,则
的坐标为_____________ ,直线
与椭圆
交于
,
两点,且
的重心恰为点
,则直线
斜率为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a1117b02834304c418f9acfebbff5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/092fd1b1d33979818300cd2e3699bff7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/38d0469336f71edd52dc9148c67db052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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解题方法
3 . 椭圆
的离心率为
,其左焦点到点
的距离为
,不过原点O的直线
与C交于A,B两点,且线段AB被直线OP平分.
(1)求椭圆C的方程;
(2)求k的值;
(3)求
面积取最大值时直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4754fbe523ca63eba3810a3f88f37df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc5bd66dd6d5e09ff0893a938aed56e.png)
(1)求椭圆C的方程;
(2)求k的值;
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
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2020-03-10更新
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3卷引用:浙江省绍兴市诸暨市诸暨中学(实验班)2019-2020学年高二上学期期中数学试题
名校
4 . 已知椭圆
的长轴长为4,离心率为
.
(Ⅰ)求椭圆
的方程;
(Ⅱ)当
时,设
,过
作直线
交椭圆
于
、
两点,记椭圆
的左顶点为
,直线
,
的斜率分别为
,
,且
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b0dadb875cccce870b69409a476606.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(Ⅰ)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1bc6c708fb34c2bd6d27b48092cc9eb.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.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/7eac9ba606fb477550aa62db7bfa0ac4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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3卷引用:浙江省慈溪市2018-2019学年高二第二学期期末数学试题
名校
5 . 已知直线
与椭圆
恒有公共点,则实数m的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78c92d2350275a1d3dc05fc572dab97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9245bcd41d205729db25adb95f54274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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590次组卷
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5卷引用:浙江省湖州市菱湖中学2018-2019学年高二12月月考数学试题
11-12高二下·浙江台州·阶段练习
6 . 已知
:方程
表示双曲线;
:过点
的直线与椭圆
恒有公共点,若
为真命题,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252f44e92b12514f257172ca2f26bfa7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d23fc512ad69a2d5919ce690407704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08a05f948d61080fdfc8d68a94df0bf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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3卷引用:2011-2012年浙江省台州中学高二第二学期第一次统考理科数学
(已下线)2011-2012年浙江省台州中学高二第二学期第一次统考理科数学吉林省吉化一中、前郭五中等2017-2018学年高二上学期期中考试数学(文)试题吉林省吉化一中、前郭五中等2017-2018学年高二上学期期中考试数学(理)试题