56乘以199加56怎么简便?201乘以38减38怎么简便?
问题描述:
56乘以199加56怎么简便?201乘以38减38怎么简便?
答
=56×(199+1)=56×200=11200
=38×(201-1)=38×200=7600
答
56*199+56 = 56*(199+1) = 56*200 = 11200
201*38-38 = (201-1)*38 = 200*38 = 7600