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hejoseph 发表于 2024-3-22 16:21 过点 $M$ 作 $AC$ 的垂线,垂足为 $D$,设 $BC=1$,上一楼已经求得 $AM=\sqrt{6}$,所以 $AD=MD=\sqrt{3}$ ...
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2025-7-20 08:00 GMT+8
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