原式=4.6x(1-0.25)+0.75x5.4=4.6x0.75+0.75x5.4=(4.6+5.4)x0.75=10x0.75=7.5供参考。
简算:=4.6x(1-0.25)+0.75x5.4=4.6x0.75+0.75x5.4=(4.6+5.4)x0.75=10x0.75=7.5