已知双曲线E:
的左、右焦点分别为
、
,点P在双曲线E上,且
,则
=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c58fa4a337f0b81b991fb32e8e6e3c0.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/12f977940552e09f59ea959965522dfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96fa27f8db6167d4802a510371077bb5.png)
更新时间:2023-01-31 14:22:27
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【知识点】 利用双曲线定义求点到焦点的距离及最值
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【推荐1】已知
是双曲线
上任意一点,若
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【推荐2】双曲线
上一点
到它的一个焦点的距离为7,则点
到另一个焦点的距离等于__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6e1ec223f0e5bfbb9721f0bdce8e71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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