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1 . 已知抛物线
的焦点为F,直线
与抛物线C交于A,B两点(其中点A在x轴上方),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb8834ccd70a23afc4e2e10c39cef2.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aa3227349546a6cc56ab8a3c3ee3057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb8834ccd70a23afc4e2e10c39cef2.png)
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2021-09-10更新
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