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[几何] 抛物线上三个点和另一定点形成平行四边形

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1+1=? Posted 2025-5-31 14:02 From mobile phone |Read mode
Last edited by hbghlyj 2025-5-31 17:41如图,平面一定点$A$,过点$A$作抛物线$h$的弦中点$M$,则$M$的轨迹是抛物线$g$,过点$A$作平行于对称轴的直线交$h$于$B$点,作$B$关于$A$的中心对称点$B'$,则抛物线$g$以$B'$为中心放大两倍得到$h$。

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hbyj辛苦了🌹🌷🌹🌷❤️  Posted 2025-5-31 17:50

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 Author| 1+1=? Posted 2025-5-31 14:04 From mobile phone
Last edited by hbghlyj 2025-5-31 17:41作$B'$关于$M$的对称点$B''$得到平行四边形

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 Author| 1+1=? Posted 2025-5-31 18:44 From mobile phone
大家有什么可行的方法证明嘛

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