已知双曲线
的左焦点为
,点P在双曲线的右支上,若线段
与圆
相交于点M,且
,则直线
的斜率为________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5964c9cef1f322dee4b2831487d92912.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54329a84abb204cecb237b2bf2ff2bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaca1a6cca80408e2e182ac6d13bb27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac86e1c253297a377e14fb9a1689be8.png)
更新时间:2020-05-09 08:10:37
|
【知识点】 利用定义解决双曲线中焦点三角形问题
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【推荐1】设F1,F2分别为双曲线
的左、右焦点若在双曲线左支上存在点P,满足|PF1|=|F1F2|,且F1到直线PF2的距离为
,则该双曲线的离心率e=______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f2c0fc4318bb78f644c3a3bd323cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ef12c9897a5f2639c103cb99cbb1468.png)
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解题方法
【推荐2】已知双曲线
的左,右焦点
,
,经过
的直线l与双曲线的左支相交于P,Q两点.记
的内切圆的半径为
,
的内切圆的半径为
.若
,则双曲线的离心率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ec7fa23be9cbe9a50607ea6bc8a4ff.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/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc844e730461a7d75ce6661bbfc44b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2482a010f9b62520d041078f466899e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/286ef09c35e35cc8c9344ade2a18bb9f.png)
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