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12.5x8.7x0.8的简便计算

12.5x8.7x0.8 =(12.5x0.8)x8.7 =10x8.7 =87

12.5x0.7x0.8 =12.5×8×0.07 =100×0.07 =7

原式 =12.5×0.8×73 =10×73 =730 满意采纳奥 还有疑问请追问

12.5x7.8+1.25 =1.25x(7.8+1) =1.25x(8+0.8) =10+1 =11

原式 =12.5x9.7+12.5x8.7 =12.5x(9.7+8.7) =12.5x18.4 =12.5x(8x2.3) =12.5x8x2.3 =100x2.3 =230

0.7×4-5X=0.8 2.8-5X=0.8 -5X=0.8-2.8 -5X=-2 X=2÷5 X=0.4

如图

12.5X7.2X0.8 换算成(12.5X0.8)X7.2= 10X7.2= 72

3.7*100-3.7=370-3.7=366.3 40*0.25*(0.8*12.5)=10*10=100 2.8*(3.6+1.4)=2.8*5=14

解: 13·5x7·6十3·8 =13.5*2*3.8+3.8 =27*3.8+3.8 =(27+1)*3.8 =(30-2)*3.8 =30*3.8-2*3.8 =114-7.6 =106.4

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