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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

=(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

1.25×213×0.8 =1.25×0.8×213 =1×213 =213

(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÷...

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

1.25x9.97x0.8 =1.25x0.8x9.97 =1x9.97 =9.97

1.25×0.8+0.2÷1,25 =1+0.16 =1.16。

=1.25×0.8×2/3×1/2=1×1/3=1/3

解:原式=1.25×0.8×0.32 =1×0.32 =0.32 望采纳

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