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FFF=F×111=F×3×37,由於兩個兩位數AB和CD相乘,得到FFF,那麼其中一個應該是37,另一個是3與F的乘積.設AB=37,而CD是3的倍數(你反過來設也可以,即CD=37,AB是3的倍數).注意到F是一位數,最大是9,那麼CD不能…
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