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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

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

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*(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÷...

1.25×0.9×0.8 =(1.25×0.8)×0.9 =10×0.9 =9 请采纳,谢谢!

1.25×0.8×3.37 =1×3.37 =3.37

39×1.25+ 0.8 =(40-1)x1.25+0.8 =40x1.25-1x1.25+0.8 =50-1.25+0.8 =50-1-0.25+0.8 =49+0.8-0.25 =49+0.55 =49.55 谢谢,请采纳

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