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0.25x28

0.25×0.4×0.7=0.1×0.7=0.07

28×0.25 =7×(4×0.25) =7×1 =7

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

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

原式=23.3*1.25+56*1.25+1.25*28.7 =1.25*(23.3+56+28.7) =1.25*108 =1.25*(100+8) =1.25*100+1.25*8=125+10=135

请采纳

解: 设这个数是x,则 0.25x+28=0.6x (0.6-0.25)*x=28 0.35x=28 x=80 答: 一个数的0.25比它的0.6少28,这个数是80.

8•6乘以(1•28-0•28)=8•6乘以1=8•6

6分之1:28=x:0.25,x=672分之1,具体过程如下: 6分之1:28=x:0.25 28x=6分之1×0.25 28x=6分之1×4分之1 28x=24分之1 x=24分之1÷28 x=672分之1

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