1 . 已知椭圆
,双曲线
,
为
的焦点,
为
和
的交点,若△
的内切圆的圆心的横坐标为2,
和
的离心率之积为
,则该内切圆的半径为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd486b8796b3454eab219c28ed131683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b290c454f7a0c796abf528aad227e530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5a8e1bc9748e5519dcd9981b7eb251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b8503f4706b8321e4e79a87eadea84.png)
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2 . 如图所示,
,
分别为椭圆的左,右焦点,椭圆上点
的横坐标等于右焦点的横坐标,其纵坐标等于短半轴长的
,则椭圆的离心率为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/c29095f4-b7c4-4e4b-8700-b60e3e8a3f36.png?resizew=199)
![](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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/c29095f4-b7c4-4e4b-8700-b60e3e8a3f36.png?resizew=199)
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2019-12-25更新
|
611次组卷
|
3卷引用:四川省南充高级中学2019-2020学年高二上学期12月月考数学(文)试题
3 . 已知椭圆
(
)的左右焦点分别为
,
,若椭圆上存在一点
使得
,则这椭圆的离心率的取值范围为( )
![](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/5076829e649b3f3866d4a7e07a5713e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697c20fca284394bf5d5b9e5f6d952e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f40745342536391ef74b81f506af437.png)
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解题方法
4 . 由半椭圆
与半椭圆
合成的曲线称作“果圆”,如图所示,其中
,
.由右椭圆
的焦点
和左椭圆
的焦点
,
确定
叫做“果圆”的焦点三角形,若“果圆”的焦点为直角三角形.则右椭圆
的离心率为( )
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436970073800704/2437259335106560/STEM/06489242-d1df-4f22-afe8-52dfd0743e42.jpg?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13068aa6d4e3a155d14a2bfd7ab413e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1173f3888e73861665d62df65ee00510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671241e869118e81afc8cc427d24fe22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497d269c30eec393e3f0e877ddbe2983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13068aa6d4e3a155d14a2bfd7ab413e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b519e5794ef9932b64715619adf860db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1173f3888e73861665d62df65ee00510.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/88c2bfe459cac775a7b0d09b612de84f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13068aa6d4e3a155d14a2bfd7ab413e5.png)
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436970073800704/2437259335106560/STEM/06489242-d1df-4f22-afe8-52dfd0743e42.jpg?resizew=189)
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17-18高二·全国·课后作业
名校
5 . 点P(x,y)是椭圆
(a>b>0)上的任意一点,F1,F2是椭圆的两个焦点,且∠F1PF2≤90°,则该椭圆的离心率的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
A.0<e≤![]() | B.![]() |
C.0<e<1 | D.e=![]() |
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2018-11-08更新
|
766次组卷
|
5卷引用:活页作业15 椭圆的简单性质-2018年数学同步优化指导(北师大版选修2-1)
(已下线)活页作业15 椭圆的简单性质-2018年数学同步优化指导(北师大版选修2-1)(已下线)活页作业9-2018年数学同步优化指导(北师大版选修1-1)内蒙古赤峰二中2020-2021学年高二上学期第一次月考数学(理科)试题(已下线)3.1.1 椭圆(第一课时)(精练)-2020-2021学年一隅三反系列之高二数学新教材选择性必修第一册(人教A版)2017-2018学年甘肃省兰州市第一中学高三上学期期中考试数学 理
6 . 如图,离心率为2的双曲线
与椭圆
有共同的焦点
,
分别是
,
在第一、三象限的交点,若四边形
是矩形,则椭圆
的离心率为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/ee136d79-b75e-46dc-899a-6419be84ea85.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9cdcc25290844c9d4c088bf58afada.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/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb9c075a320b0fe23145061b1fb0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/ee136d79-b75e-46dc-899a-6419be84ea85.png?resizew=188)
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7 . 已知椭圆C:
,
的上、下顶点分别为
,且以线段
为直径的圆与直线
相切,则C的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434249d6640b0c1a712d215cf8b83d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663368000ac90f582d12675aa2d1e832.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7419469c9790a43dedc489e9d8465f.png)
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8 . 已知椭圆
的左、右焦点分别为
,
,过
的直线与椭圆交于
、
两点,若
是以
为直角顶点的等腰直角三角形,则离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.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/a3fb78c5f885034612c0e030b920143d.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/47ff8a5886e42095da57422c8777c10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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9 . 已知椭圆
+
=1(a>b>0)短轴的两个端点为A、B,点C为椭圆上异于A、B的一点,直线AC与直线BC的斜率之积为-
,则椭圆的离心率为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cf6c83cb6c14b1e4c5b62971cd0ec43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb79009bf32bee98374d74b54050351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10402e4ddd0d323cc1ae83801ae976db.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-12-09更新
|
633次组卷
|
2卷引用:黑龙江省哈尔滨市实验中学2019-2020学年高二上学期期中数学试题