54.9*0.38和4.05+37.85用简便方法

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54.9*0.38和4.05+37.85用简便方法
54.9*0.38和4.05+37.85用简便方法

54.9*0.38和4.05+37.85用简便方法
54.9x0.38=（55-0.1）×0.38=55×0.38-0.1×0.38=（50+5）×0.38-0.1×0.38=50x0.38+5x0.38-0.1x0.38=19+1.9-0.038=20.9-0.038=20.8624.05+37.85=41.9

54.9*0.38和4.05+37.85用简便方法 54.9×0.38,4.05+37.85怎么简算? 简算 54.9乘0.38 4.05加37.85 *和^, 和和 “和” >和和和和和和和和比大小：3.15和7分之22,0.38和100分之38,2分之6和6分之2,10分之9和1.9 54.9*0.38= 4.05+37.85= 2.96*40= 简便方法计算,54.9*0.38=4.05+37.85=2.96*40= 1,54.9×0.38简算 2,9.8 ×25简算?3,4.05+37.85简算?