真题
解题方法
1 . 设椭圆
的左、右焦点分别为
,
,A是椭圆上的一点,
,原点O到直线
的距离为
.
(1)证明
;
(2)求
使得下述命题成立:设圆
上任意点
处的切线交椭圆于
两点,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df90497fae2eee9c7c8e7ce3c180d46.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/1b9798e82d9baaba782159f1ff0b954c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabea664e61863b3b3279dbce607924e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8af2c8284fa7d93d9e12d428ff9a4c.png)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4037561c629fd07503c6803e1eb62fb6.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26f8e1cad7acd507f06b9e932b2e84cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa7de36c61b46411ca108be04d35267a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22962a2ad892cb6b14ab039a06e8cdc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357e0872d9e98d662a780e7686de86ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31fbd58d7ab0d4c6a4a3e282beb8a1f5.png)
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