2510*3.8+215*51+2.15*1400+850*9.6+0.85*700 简便计算

2150 X 3.8 + 215 X 51 + 2.15 X 1400 + 850 X 9.6 + 0.85 X 700
= 215 X 38 + 215 X 51 + 215 X 14 + 85 X 96 + 85 X 7
= 215 X (38 + 51 + 14) + 85 X (96 + 7)
= 215 X (38 + 65) + 85 X 103
= 215 X 103 + 85 X 103
= (215 + 85) X 103
= 300 X 103
= 30900