〈(1。8-0。6)/口+2。5〉x0。4 = 3。4〈1。2/敬含轿口+2。5〉老枯x0。4 = 3。4 0。48/口+1 = 3。40。48/口亮肆 = 2。4口 = 0。48/2。4 = 0。2
【(1.8-0.6)/()+2.5】*0.4=3.4