哎呀，好像還有規律：5x6-2x3=6x7-2x9=6x9-5x6=24, 差數都是12，嘻嘻嘻。。。。

來源: 不愛數字於 2012-11-16 05:57:15 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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