如图,在平面直角坐标系xOy中,
,
分别是椭圆
的左,右焦点,点P是椭圆E上一点,满足
轴,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/f0206cfe-8d3a-45d1-8af0-f4f0efcc7a45.png?resizew=223)
(1)求椭圆E的离心率;
(2)过点
的直线l与椭圆E交于两点A,B,若在椭圆B上存在点Q,使得四边形OAQB为平行四边形,求直线l的斜率.
![](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/e7e5578ca83f5bd5c285994061b9c015.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa9a6be97b5f275d55697fd3cd0a442.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b6e8466c7299fbe94687ba5916a7be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/10/f0206cfe-8d3a-45d1-8af0-f4f0efcc7a45.png?resizew=223)
(1)求椭圆E的离心率;
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96d115c78edb2cc5a9446c1e8f1ec3ad.png)
更新时间:2019-12-12 15:22:03
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相似题推荐
解答题-问答题
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较难
(0.4)
解题方法
【推荐1】已知椭圆
:
的短半轴长为1,焦距为
.
(1)求椭圆
的离心率;
(2)设椭圆
的右顶点为
,过点
且斜率为
的直线交椭圆E于不同的两点
,直线
分别与直线
交于点
.求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93d7f653c52c9e7fef70f3621a8f57c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设椭圆
![](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/af74113f38fffeed8075e57d7f9d2533.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bcb166b53a49e393871bcb14a528792.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b3031d7393a63719166285314d73f.png)
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【推荐2】如图,已知椭圆的标准方程为
,斜率为k且过椭圆右焦点F的直线交椭圆于A、B两点.
![](https://img.xkw.com/dksih/QBM/2021/11/20/2855169756839936/2857699254460416/STEM/49af3674-17b4-45c5-b279-18b45e97623e.png?resizew=263)
(1)若
与
共线.
(i)求椭圆的离心率;
(ii)设P为椭圆上任意一点,且
(λ,μ∈R),当
时,求证:
.
(2)已知椭圆的面积
,当k=1时,△AOB的面积为
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://img.xkw.com/dksih/QBM/2021/11/20/2855169756839936/2857699254460416/STEM/49af3674-17b4-45c5-b279-18b45e97623e.png?resizew=263)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad7ce915e732d42fdab42890b716c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e457fb5bbf58b821b2059575e28712c.png)
(i)求椭圆的离心率;
(ii)设P为椭圆上任意一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59bca4c0ab83a3ca3b0ebf03281be74f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f5b26a534cd57031f87deed44ccc76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7590de85fbde1728e65193b933a82bf8.png)
(2)已知椭圆的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62c6f18dd8b0c2706a1891e10135923.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23c3f647d5c34fa92a5034089d14ef32.png)
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解题方法
【推荐1】已知椭圆
的左、右焦点为
,
为
上一点,
垂直于
轴,且
、
、
成等差数列,
.
(1)求椭圆
的方程;
(2)直线l过点
,与椭圆
交于
两点,且点
在
轴上方. 记
的内切圆半径分别为
,若
,求直线
的方程.
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0739793f234f8e86adc6177801ae7295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e99c00835ffc1896285fd94f1f78ae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fee11267fe65012658a5fe1f27b64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de0159daeb62cb68801c7a6e971f39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc47b02d4b4bedf20be6a0885a128d50.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)直线l过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6554ac3dff4a59833e407db887f6e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f05faf2edecea8143b25d1d0a6a5f298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8543261a8e351eb95cdfebb001a3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5067c78657e8783c3145d66d3aa59247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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【推荐2】已知椭圆中有两顶点为
,
,一个焦点为
.
(1)若直线
过点
且与椭圆交于
,
两点,当
时,求直线
的方程;
(2)若直线
过点
且与椭圆交于
,
两点,并与
轴交于点
,直线
与直线
交于点
,当点
异
,
两点时,试问
是否是定值?若是,请求出此定值,若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55d12701014cf53071093e8739d089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2347bec7975dab2b8bce2fd19b1237d0.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d141bb2fc1c41df86076cb3e36220156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c1e8e282254b4ea5c61dc5fce00b02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/9a5215b714cde3ed7790b3ed4f6711c3.png)
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