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0.8除以1.25脱式计算

0.8÷1.25 =80÷125 =16/25

=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

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

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

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

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

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

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

括号里的20-1点二五×0点八括起来除以一点九脱式计算 解: (20-1.25×0.8)÷1.9 =(20-1)÷1.9 =19÷1.9 =10

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