124*0.456-123*0.455怎样用简便算法

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124*0.456-123*0.455怎样用简便算法

124*0.456-123*0.455怎样用简便算法
124*0.456-123*0.455怎样用简便算法

124*0.456-123*0.455怎样用简便算法
124*(0.455+0.001)-123*0.455
=(124-123)*0.455+0.124
=0.455+0.124
=0.579

124*(0.455+0.001)-(124-1)*0.455
=124*0.455+0.124-124*0.455+0.455
=0.124+0.455
=0.579