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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

1.25x0.7x0.8 =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÷...

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

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

解:原式=1.25×0.8×0.32 =1×0.32 =0.32 望采纳

(1)1.25×8.37×0.8 =1.25×0.8×8.37,=1×8.37,=8.37;(2)(9-2.35)×0.64=6.65×0.64,=4.256;(3)0.25×32×12.5=(0.25×4)×(8×1.25),=1×10,=10;(4)0.15×1999+0.15 =(1+1999)×0.15,=2000×0.15,=300;(5)0.37×1.4-0.4×0.37=(1....

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

=(1.25x0.8)x(2.5x0.4) =1x1 =1

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