如题所述
56*199+56 = 56*(199+1) = 56*200 = 11200
201*38-38 = (201-1)*38 = 200*38 = 7600
201*38-38 = (201-1)*38 = 200*38 = 7600
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第1个回答 2014-03-12
=56×(199+1)=56×200=11200
=38×(201-1)=38×200=7600
=38×(201-1)=38×200=7600