解题方法
1 . 已知椭圆
的离心率为
,则椭圆
的长轴长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fde493afaa359ec6728f69b6d0231f2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
2 . 已知正方形
的四个顶点均在椭圆
上,
的两个焦点
分别是
的中点,则
的离心率是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0fe9059acc47d2447576e1260c4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c4cd264c97c1f261229925cc5a6761.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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名校
3 . 已知椭圆
的左右焦点分别是
,
,过
的直线与
相交于A,B两点,若
,
,则
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/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595204f5b59b488a4532af8f0555c77a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2962f9b7b3d3a2d9a4ceb99a19b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-03-22更新
|
554次组卷
|
2卷引用:福建省福州市八县(市)协作校2023-2024学年高二上学期期末数学试题
名校
解题方法
4 . 已知椭圆C:
的左、右焦点分别为
,
,P为C上一点,满足
,以C的短轴为直径作圆O,截直线
的弦长为
,则C的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.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/c2427943a38dcd93c9ec9b735ffc9fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ec189df9aa2b3c46de719d0057a05f.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2024-03-14更新
|
1062次组卷
|
5卷引用:海南省海口市2024届高三摸底考试数学试题
解题方法
5 . 已知椭圆
的右焦点为
,
为坐标原点,
上位于第一象限的点
满足
,若直线
的斜率为
,则
的离心率为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24550b13dbecf7d86c7054250e987274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/d83eeb3772ef399193d5be5e72f58447.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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6 . 如图,椭圆
和
有相同的焦点
,离心率分别为
为椭圆
的上顶点,
与椭圆
交于点B,若
,则
的最小值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace33c3443bed80275fe9e690d850d2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8dafca560c47c8fb4ed217c15539f5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f808889a5870c7be4b96be301bb388ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323842451e79bcbb1c1a3a7de77aba21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c689870513662663e618c2de3f5fadf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/6/9e842587-7f31-42b5-be01-b4e0b0f700ff.png?resizew=198)
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解题方法
7 . 已知椭圆
:
与圆
交于M,N两点,直线
过该圆圆心,且斜率为
,点A,B分别为椭圆C的左、右顶点,过椭圆右焦点的直线
交椭圆于D、E两点,记直线
,
的斜率分别为
,
.
(1)求椭圆
的离心率;
(2)若
,求
的值.
![](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/f8e3ff40745c411b8008aa5e4cc1de91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39900a2d790732077ffb571427a134fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67351fe10fcfc3f9072eec4c60bfaaa5.png)
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解题方法
8 . 如图1所示,套娃是一种木制玩具,一般由多个相同结构的空心木娃一个套一个组成,套娃的截面可近似看成由圆和椭圆的一部分组成.建立如图2所示的平面直角坐标系,圆A:
的圆心是椭圆的上顶点,半径是椭圆的短半轴长,则椭圆的离心率为______________ ;若动直线
与圆的上半部分和椭圆的下半部分分别交于B,C两点,则当
的面积最大时,
的值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385c0c2bd59b09791069d1952ae62904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6f7b16d65f1b2b8bea8cf4a83fde925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72daa42d22bc47a9585772e5c56b0c54.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/4/88aca1ff-9b2e-4cc4-b150-5d61d290af18.png?resizew=326)
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9 . 设椭圆
与椭圆
的离心率分别为
,若
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b40f49ff3674900ac1d48a4dd7f61011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0b3317c867a1b51cd8d8fdf3aab8d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/128a5c52f02281554cf786afb1118dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24badb5f882ee8fde8640137f719102b.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
10 . 已知椭圆
:
的左,右焦点分别为
,
,
为坐标原点,若以
为直径的圆与椭圆
在第一象限交于点
,且
是等边三角形,则椭圆
的离心率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643ef7d761de0e794fc39937dc72ac6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e8df70d56fe97837cdfb0cf5de3fb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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