逻辑是一样的, 先反证法证明ABCD是正方型.

来源: 网恋无罪于 2012-12-06 12:38:44 [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.