证明 EFDG 以DE对称，则 X=30 角BDE=80

来源: longsky 于 2016-09-01 13:47:37 [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.