1 . 已知椭圆
的离心率为
,过左焦点
的直线与椭圆交于
两点,若线段
的中点为
.
(1)求椭圆的方程;
(2)过右焦点的直线
与圆
相交于
、
,与椭圆
相交于
、
,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3544fc58ec56e178a80cd5cc903a3457.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d0695bd835a8724e664193227d627a.png)
(1)求椭圆的方程;
(2)过右焦点的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d61985901c2bc698d72ac88f4e1eb65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84dea771a6c35a65cf02109b2eab1f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74299041d37f4b1c1fc3cd8b9f8fe7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8998b0b25aceb10e4a8f505b0d63525.png)
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解题方法
2 . 已知椭圆
的左、右两个焦点
,过其中两个顶点的直线斜率为
,过两个焦点和一个顶点的三角形面积为1,
(1)求椭圆的方程;
(2)如图,点
为椭圆上一动点(非长轴端点),
的延长线与椭圆交于
点,
的延长线与椭圆交于
点,求
面积的最大值,并求此时直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
(1)求椭圆的方程;
(2)如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabea664e61863b3b3279dbce607924e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/13/2d9f402c-55c9-4baf-bc54-0c518b3d423e.png?resizew=256)
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名校
3 . 已知椭圆C:
+
=1(a>b>0)的两个焦点分别为F1(﹣2,0),F2(2,0),离心率为
.过焦点F2的直线l(斜率不为0)与椭圆C交于A,B两点,线段AB的中点为D,O为坐标原点,直线OD交椭圆于M,N两点.
(Ⅰ)求椭圆C的方程;
(Ⅱ)当四边形MF1NF2为矩形时,求直线l的方程.
![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499629842432/1572499635699712/STEM/8c0dae097757474e978c2461b3088601.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499629842432/1572499635699712/STEM/df35148eebc04591b0fc0125a5dd527f.png?resizew=19)
![](https://img.xkw.com/dksih/QBM/2016/2/25/1572499629842432/1572499635699712/STEM/0b003130a56048c4875031f1677477b6.png?resizew=20)
(Ⅰ)求椭圆C的方程;
(Ⅱ)当四边形MF1NF2为矩形时,求直线l的方程.
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