用反证法可以证明。如果把AD=AE换成 AB=AC，结论也成立。

来源: yma16 于 2018-07-20 09:46:46 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.