C(6,3)=20，他後麵又乘了3，包含你說的情況

來源: 老石於 2012-12-28 21:29:20 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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