解题方法
1 . 已知
分别为椭圆
的左、右焦点,
为椭圆的上顶点,
为正三角形, 且
为椭圆上一点,
为椭圆外一点,
的最小值为
,过点
且垂直于
轴的直线交为椭圆于
两点, 直线
与
相切并且交椭圆于
在直线
的两侧)两点.
(1)求椭圆的方程;
(2)当四边形
的面积最大时, 求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47444b5fbc4252516d54263062e47c81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65304d03bb720d836e7bbd2fab6e977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdeb51d4c591643b189d102d31648874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d7d436bb96d03f111de6850cf2c7965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49137970108f50350a3211aa0281faaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4324dacfc94867f192cefc9e589fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)求椭圆的方程;
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5627dee61ff1a179ed56a7e627927448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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