I think changing 50 questions to 30 is better.There whould be on

來源: jinjing 於 2010-10-25 06:25:14 [檔案] [舊帖] [給我悄悄話] 閱讀數 : (0 bytes)

回答: 生活中的數學（8）由 NaCl 於 2010-10-24 17:35:45

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