已知
是椭圆
的左焦点,P是此椭圆上的动点,
是一定点,则|PA|+|PF|的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cb4717d7fa6d522090c5e949f650bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26e951d6d2369e8da79a793a93a66a4.png)
更新时间:2021-12-14 20:50:00
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【知识点】 求椭圆中的最值问题
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