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4.2×(1.25乘以0.8)脱式计算

4.2×(1.25乘以0.8) =4.2x(1.25x0.8) =4.2x1 =4.2

=0.8*(1.25*0.4+2.5*0.4)=0.8*(0.5+1)=(0.8*0.5+0.8*1)=0.4+0.8=1.2

1.25*(8+0.8) =1.25*8+1.25*0.8 =10+1 =11

1.25×0.8×3.37 =1×3.37 =3.37

用1.25×0.8再乘以3.75

1.25*7.2*0.8 =1.25x0.8x7.2 =1x7.2 =7.2 祝你学习进步,有不明白的可以追问!谢谢!!

5.6×0.8×1.25脱式计算 解:采用分配律, 原式=5.6x(0.8x1.25) =5.6x1 =5.6

1.25x(0.4+0.8) =1.25×0.4+1.25×0.8 =0.5+1 =1.5

解:1.25 × 8 + 0.8 × 7 = (1×100 + 25)/100 × 8 + 8/10 × 7 = 125/100 × 8 + 56/10 = 1000/100 + 560/100 = 1560/100 = 78/5 = 15.6

1.25x0.7x0.8 =1.25x0.8x0.7 =1x0.7 =0.7

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