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计算下面各题能简便的就简便.6.54×1.2%1.87 12.5x...

解:采用分配律, 原式=6.54×1.2-1.87 =6.54x(1+0.2)-1.87 =6.54+6.54x0.2-1.87 =6.54+1.308-1.87 =7.848-1.87 =5.978

用计算机

6.54*1.2-1.87 =6.54x(1+0.2)-1.87 =6.54+6.54x0.2-1.87 =6.54+1.308-1.87 =5.978

6.54×1.2-1.87 =6.54×(1+0.2)-1.87 =6.54+1.308-1.87 =6.848-1.87 =4.978

6.54×1.2-1.87 =7.848-1.87=5.978; 3.17+0.4×1.6=3.17+0.64=3.81;5.2×0.1×28.5 =0.52×28.5=14.82;3.7×10.1=3.7×10+3.7×0.1=37+0.37=37.37.

1、①6.54×1.2-1.87 =7.848-1.87 =5.978; ②86.4÷0.24+40 =360+40 =400; ③0.46×1.9+0.54×1.9 =1.9×(0.46+0.54) =1.9×1 =1.9; ④13.65÷0.25÷4 =13.65÷(0.25×4) =13.65÷1 =13.65. 2、其中③ ④可以用简便方法。 3、③的简便方法:乘法分配率:(...

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