www.qcfz.net > 4x6=24,14x26=224,24x26=624,34x36=1224......

4x6=24,14x26=224,24x26=624,34x36=1224......

易见4和6前面的数字应该相同,将之设为M, 则当M为0,1,2,3时,两数相乘的结果所对应的24前

1、(10n+4)*(10n+6) =100n*n+40n+60n+24 =100n(n+1)+

(10a+4)*(10a+6)=100a(a+1)+24

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