讚嚴密認真-

來源: guest007 於 2010-07-09 09:27:02 [舊帖] [給我悄悄話] 本文已被閱讀：次

通解數字答案是純數學歸納，看看是否先列個通解公式 - 一行。。。一步隻遙

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