已知椭圆
,过坐标原点
作两条互相垂直的射线,与椭圆分别交于
两点.
(Ⅰ)求椭圆的离心率;
(Ⅱ)求证:点
到直线
的距离为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/623567de59e50e4066c20804e9168ca9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad57e3727b7bbd795b05332fbf9649e9.png)
(Ⅰ)求椭圆的离心率;
(Ⅱ)求证:点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
更新时间:2019-04-28 15:14:05
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知点
为椭圆
上的任意一点(长轴的端点除外),
、
分别为左、右焦点,其中
为常数.
![](https://img.xkw.com/dksih/QBM/2015/7/30/1572196091510784/1572196097499136/STEM/5d6d132dccf64285a3f1aa49d3c9bcce.png?resizew=185)
![](https://img.xkw.com/dksih/QBM/2015/7/30/1572196091510784/1572196097499136/STEM/9979365ad04948b5a80b504ac944a34f.png?resizew=226)
(1)若点
在椭圆的短轴端点位置时,
为直角三角形,求椭圆的离心率.
(2)求证:直线
为椭圆在点
处的切线方程;
(3)过椭圆的右准线上任意一点
作椭圆的两条切线,切点分别为
.请判断直线
是否经过定点?若经过定点,求出定点坐标,若不经过定点,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caf0d139c9810361b4971904a943856b.png)
![](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/632244ea6931507f8656e1cc3437d392.png)
![](https://img.xkw.com/dksih/QBM/2015/7/30/1572196091510784/1572196097499136/STEM/5d6d132dccf64285a3f1aa49d3c9bcce.png?resizew=185)
![](https://img.xkw.com/dksih/QBM/2015/7/30/1572196091510784/1572196097499136/STEM/9979365ad04948b5a80b504ac944a34f.png?resizew=226)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d776753746914c2410a3946c357f35.png)
(2)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58c5d240dd696fa72dc7d1e6a1a9adc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)过椭圆的右准线上任意一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0a44fa352255b81702d306cb32cf468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09fcb20a6972108871adbf284f9e5006.png)
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解答题-问答题
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适中
(0.65)
名校
解题方法
【推荐2】已知椭圆
的短轴长为
,一个焦点为
.
(1)求椭圆
的方程和离心率;
(2)设直线
与椭圆
交于两点
,点
在线段
上,点
关于点
的对称点为
.当四边形
的面积最大时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638f7587499b237047d7a2fce36311df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a325d9e58114fca35497ce45be944ae8.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ced257357a44461e8ec55f4fcda2a07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-问答题
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适中
(0.65)
【推荐1】.已知圆
与直线
相切.
(1)求以圆O与y轴的交点为顶点,直线在
轴上的截距为半长轴长的椭圆C方程;
(2)已知点A
,若直线与椭圆C有两个不同的交点E,F,且直线AE的斜率与直线
AF的斜率互为相反数;问直线的斜率是否为定值?若是求出这个定值;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b4bcb812c997db47214cb52c905f99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ccec3c0241c51d677fb9cdf0184bbcd.png)
(1)求以圆O与y轴的交点为顶点,直线在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)已知点A
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2de52259b426acb42761fec59a7748.png)
AF的斜率互为相反数;问直线的斜率是否为定值?若是求出这个定值;若不是,请说明理由.
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解答题-问答题
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适中
(0.65)
【推荐2】已知椭圆C的方程为
,离心率为
,它的一个顶点恰好是抛物线
的焦点.
(Ⅰ)求椭圆C的方程;
(Ⅱ)过动点
的直线交
轴的负半轴于点
,交C于点
(
在第一象限),且
是线段
的中点,过点
作x轴的垂线交C于另一点
,延长线
交C于点
.
(i)设直线
,
的斜率分别为
,
,证明:
;
(ii)求直线
的斜率的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d249d578c210fd2a4ad7846132594ea7.png)
(Ⅰ)求椭圆C的方程;
(Ⅱ)过动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b679d765db8737c489cb940834c0e393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(i)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1db99e2a38deda78667bde7b4134d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a68fe9d4c24b788a3a54fbb4eee073af.png)
(ii)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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