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12.5×6.4怎样简便运算

2.5x(4x2x0.8) x12.5 =(2.5x4)x2x(0.8x12.5) =10x2x10 =200

12.5*6.4 =12.5*8*0.8 =100*0.8 =80

6.4×1.25×12.5 =8×1.25×0.8×12.5 =10×10 =100

3.6×31.4+43.9×6.4 =3.6×31.4+(31.4+12.5)×6.4 =3.6×31.4+31.4×6.4+12.5×6.4 =31.4×(3.6+6.4)+12.5×8×0.8 =314+100×0.8 =314+80 =394

12.5×6.4-0.25×2.4 =12.5×0.8×8-0.25×4×0.6 =10×8-1×0.6 =80-0.6 =79.4

1.58÷12.5÷2.5÷6.4=0.0079 ~回答完毕~ ~\(^o^)/~祝学习进步~~~

6.4×(0.125+12.5) =(0.8×8)+(0.125+12.5) =【0.8×(0.125+12.5)】×8 =【0.1+10】×8 =10.1×8 =80.8

12.5×(0.8÷2.5) =12.5×0.8×12.5÷2.5 =10×5 =50 76.15÷0.875×7 =76.15÷7/8×7 =76.15×8/7×7 =76.15×(10-2) =761.5-152.3 =609.2 9÷0.125 =9÷1/8 =9×8 =72 6.4÷2.5 =6.4÷10/4 =6.4×4/10 =25.6/10 =2.56

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