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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

0.25×1.25×4×8脱式计算 =(0.25x4)x(1.25x8) =1x10 =10

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

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

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

(1)1.25×(80+0.8),=1.25×80+1.25×0.8,=100+1,=101;(2)4.2×7.8+2.2×4.2,=4.2×(7.8+2.2),=4.2×10,=42;(3)4×6.33×0.5,=2×6.33,=12.66;(4)20.9+10.5÷(5.2-3.7),=20.9+10.5÷1.5,=20.9+7,=27.9;(5)21÷0.25÷0.4,=21÷...

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

解: 这个脱式计算如下: 0.7x0.8=0.56 1.24+0.7x0.8 =1.24+0.56 =1.8

1.25×0.8×3.37 =1×3.37 =3.37

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