三角ADF顺时针转90度，F 到 F‘ 。很明显角AF’E=F‘AE=》等腰三角EAF’=》AE=F'E=DF+BE

来源: 网恋无罪于 2014-05-02 14:13:21 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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