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5.6×0.8×1.25脱式计算

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

4.2×(1.25乘以0.8) =4.2x(1.25x0.8) =4.2x1 =4.2

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

解:采用乘法交换律, 原式=1.25×0.96×0.8 =1.25×0.8×0.96 =1×0.96 =0.96

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

0.91÷0.8+1.25×1.08 =0.91×1.25+1.25×1.08 =(0.91+1.08)×1.25 =1.99×1.25 =2.4875

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

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

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

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

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