化简999...9*999...9+1999...9

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化简999...9*999...9+1999...9
化简999...9*999...9+1999...9

化简999...9*999...9+1999...9
原式=999...9*999...9+1000...0+999...9(9、0都为n个)
=999...9*(999...9+1)+1000...0(同上)
=999...9*1000...0+100...0(同上)
=1000...0*(999...9+1)(同上)
=1000...0(2n个0)

=999...9*999...9+1000...0+999...9(9、0都为n个) =999...9*(999...9+1)+1000...0(同上) =999...9*1000...0+100...0(同上) =1000...0*(999...9+1)(同上) =1000...0(2n个0)