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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

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

=(1.25+0.1)×4.2×0.8 =(1.25×0.8+0.1×0.8)×4.2 =(10+0.08)×4.2 =10×4.2+0.08×4.2 =42+0.336 =42.336

1.25×8×0.04 =10x0.04 =0.4 ----------------------------------

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

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

1.25x2.25x0.8 =(1.25x0.8)x2.25 =1x2.25 =2.25 希望能帮到你!

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

0.8乘1.25乘10.6 =1x10.6 =10.6

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