回複：印度的九九乘法

來源: TravellingAround 於 2010-03-27 21:26:32 [舊帖] [給我悄悄話] 本文已被閱讀：次

不覺得簡單呀，也可以這樣：
13X12
13X10=130
13X2=26
130+26=156

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