如题所述
åå¼
1111x99+2111
=1111x(100-1)+(1111+1000)
=1111x100-1111x1+1111+1000
=111100-1111+1111+1000
=111100+1000
=112100
1111x99+2111
=1111x(100-1)+(1111+1000)
=1111x100-1111x1+1111+1000
=111100-1111+1111+1000
=111100+1000
=112100
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