简便计算：48×17+51×84 65×70+360×7-70_数学解答

简便计算：48×17+51×84 65×70+360×7-70

人气：491 ℃　时间：2020-01-30 08:40:35

解答

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