已如点
,F为抛物线
的焦点,过点F且斜率为k的直线l与抛物线C交于A,B两点,若
,则k2的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adb619ca92790d5d3fa7652210ff8eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45d6ff9139d128beea7bede101cb727f.png)
更新时间:2021-05-05 10:54:26
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