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[几何] 抛物线面积2倍

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hbghlyj posted 2021-5-13 22:45 |Read mode

Last edited by hbghlyj 2021-5-13 23:36M为BC中点,F在AB上,E在AC上,AM交EF于N,N关于EF中点对称到R.
P在AB上,Q在AC上,$\vec{BP}=3\vec{AB}$,$\vec{CQ}=3\vec{AC}$.
若$\frac{\overline{FB}}{\overline{BA}}+\frac{\overline{EC}}{\overline{CA}}=2$,求证$\S{PQR}=2\S{AEF}$
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QQ截图20210513233525.png

抛物线, 切线

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kuing posted 2021-5-13 23:08

看这里：forum.php?mod=viewthread&tid=5271

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original poster hbghlyj posted 2021-5-13 23:18

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original poster hbghlyj posted 2021-5-13 23:19

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又见Zzh巨佬的文章
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