54.9×0.38=20.862
4.05+37.85=41.9
1.25×0.8×0.7
=1×0.7
=0.7
9.8×25=245
6.1×3.6+3.6×3.9
=(6.1+3.9)×3.6
=10×3.6
=36
2.96×40=118.4
一、=(55-0.1)*0.38=55*0.38-0.1*0.38=20.9-0.038=20.52
二、=4+0.05+38-0.15=42-0.1=41.9
三、=(1.25*0.8)*0.7=1*0.7=0.7
四、=(10-0.2)*25=10*25-0.2*25=250-5=245
五、=3.6*(6.1+3.9)=3.6*10=36
六、=(3-0.04)*40=3*40-0.04*40=120-1.6=118.4
20.862,41.9,(1.25*0.8)*0.7=10*0.7=7,245,36,118.4