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0.25x28

0.25×0.4×0.7=0.1×0.7=0.07

0.75x=280.2 x=280.2/0.75 x=373.6

先算乘除 后算加减 等于10.03

28×0.25 =7×(4×0.25) =7×1 =7

简便运算0.25x6.72+0.25x3.28 0.25x6.72+0.25x3.28 =0.25*(6.72+3.28) =0.25*10 =2.5

0.25X+0.28(100-X)=26.65 0.25x+28-0.28x=26.65 0.28x-0.25x=28-26.65 0.03x=1.35 x=1.35÷0.03 x=45

解:①0.25x+60%x=281720x=28, 1720×2017x=28×2017, x=321617;②(x+3)×12=48, 0.5x+1.5=48, 0.5x+1.5-1.5=48-1.5, 0.5x=46.5, 0.5x×2=46.5×2, x=93;③x-x4=38, 34x=38,34x×43=38×43, x=38×43, x=0.5; ④3.2x=58, 5x=3.2×8, 5x=2...

12.5×0.25×2.4×28=(12.5×2.4)×(0.25×28) =(12.5×0.8×3)×(0.25×4×7) =(10×3)×(1×7) =30×7 =210

过程如下: 1÷0.25x(1.28÷3.2) =1÷0.25x1.28÷3.2 =1÷0.32÷3.2 =1÷0.1 =10

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