简便计算:48×17+51×84 65×70+360×7-70

问题描述:

简便计算:48×17+51×84 65×70+360×7-70

48X17+51X84 65X70+360X7-70
=16X3X17+51X84 =65X70+36X70-70
=51X16+51X84 =70X(65+36-1)
=51X(16+84) =7000
=5100