It got to same anwser: (1/2+1/4+1/8)(1/2+1/4)4/6=7/16

来源: ManYou 于 2010-06-30 18:41:37 [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.

It got to same anwser: (1/2+1/4+1/8)*(1/2+1/4)*4/6=7/16