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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

=0.8*(1.25*0.4+2.5*0.4)=0.8*(0.5+1)=(0.8*0.5+0.8*1)=0.4+0.8=1.2

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

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

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

脱式计算 (1-0.8×1.25)÷0.01 =(1-1)÷0.01 =0÷0.01 =0

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

1.25×0.8×3.37 =1×3.37 =3.37

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

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

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