4.06x1.5x0.9脱式计算能简便的要简便4.06x1.5x0.9=1.5x2x2.03x0.9=3x2.03x0.9=6.09x(1-0.1)=6.09x1-6.09x.01=6.09-0.609=5.481
4.06x1.5x0.9=2.03x2x1.5x0.9=2.03x3x(10-0.1)=6.09x10-6.09x0.1=60.9-0.609=60.291