名校
1 . 已知椭圆
的左、右两个焦点分别为
,若经过
的直线
与椭圆相交于
两点,则
的周长等于__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cae00bdc6f8b564b6b15b32572c848b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afa4f0f2272028fe49a9bb3530ebe8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e56b5cbcf69756792fc934bcc20cb.png)
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2019-11-06更新
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3卷引用:江西省贵溪市实验中学2021-2022学年高二(三校生)下学期期末考试数学试题