经过椭圆
的左焦点
作直线交椭圆于
,
两点,
是右焦点,则
的周长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e78f1a9cc4dedc05c175ab99b288b9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05c79511154d6256dab5d1d87cb0e181.png)
更新时间:2020-03-10 21:02:03
|
【知识点】 椭圆中焦点三角形的周长问题
相似题推荐
填空题-单空题
|
容易
(0.94)
名校
解题方法
【推荐1】若过椭圆
上焦点
的直线交椭圆于点A,B,
为椭圆下焦点,则三角形
的周长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10596ef6cab7ad6b2939ae3f41e9f968.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/dec9325ab8b0f7016c011d1c37d5c25a.png)
您最近一年使用:0次
填空题-单空题
|
容易
(0.94)
名校
【推荐2】已知经过椭圆
的右焦点
作垂直于
轴的直线
,交椭圆于
,
两点,
是椭圆的左焦点,则
的周长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c86c0fe04600e6225c4951ce8dd6002b.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44a79afe78ae8496b2698c52bff397a.png)
您最近一年使用:0次