怎么觉得wxcfan123的方法更简单

来源: ym8000 于 2011-10-17 08:16:25 [旧帖] [给我悄悄话] 本文已被阅读：次

过A,B作L的垂线得垂足C,D,取P点使PC：PD=AC：BD

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