在平面直角坐标系
中,已知椭圆
,
是椭圆的左、右顶点,点
是椭圆
内(包括边界)的一个动点. 若动点
满足
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41c42a46f892dc84d8999396f93e59a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b94469fd19f40116e2dec334919d6586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d833378fedd8a5eb2135c54f3642e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f645d4b09fba53f971172cd2602c691.png)
2024高三下·上海·竞赛 查看更多[1]
更新时间:2024-03-25 14:25:02
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【推荐1】已知中心在坐标原点的椭圆
分别为椭圆的左.右焦点,长轴长为
,离心率为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe2c533dbc23a34518f72f3cb14f330.png)
(1)求椭圆
的标准方程;
(2)已知点
在椭圆
上,且
,求点
到右准线的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08588d70f2c3e0f8f3bfa4a73c08e80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe2c533dbc23a34518f72f3cb14f330.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知点
![](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/c26ce8a486d789c2e138296b62747059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】设F,E分别是椭圆
的左,右焦点,椭圆上存在点N,满足
且
的面积为20.
(1)求b的值;
(2)设点P的坐标为
,直线过点P,与椭圆交于点A,B,线段
的中点记为M.若
是
与
的等比中项,求a的最小值,并求出此时直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d71528844499d541fb06d16147a1cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35a55ff4c434ce34d90382cea5afb85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08fffabcb0a245d00182082c8cc99349.png)
(1)求b的值;
(2)设点P的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c832f2474efe89961ef41e884da7660c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cb79ed88746f9163c7c6b0b674556de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4522fdddbca40f55f3130c4c44e0bb62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e944586ad3d14e01f4d1ad9d8f4910.png)
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【推荐1】已知椭圆
的左、右顶点分别为A,B,在直线
上任取一点P,直线PA与椭圆交于点M,直线PB与椭圆交于点N,求四边形AMBN面积的最大值,并求出此时点P的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
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【推荐2】已知椭圆C:
的左、右焦点分别为
,
,过
作不平行于坐标轴的直线与椭圆C相交于A,B两点,AM垂直x轴于点M,BN垂直x轴于点N,直线AN与BM相交于点P.
(1)求证:动点P的横坐标为定值;
(2)求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc2518c64be54c16908f868034d8fa7.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)
(1)求证:动点P的横坐标为定值;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
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