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求20.5*0.12的最简便算法

20-12.5*0.12 =20-1.5 =18.5 没有简算,直接计算

20-2.5×4×0.03×5=20-10×0.15=18.5

12.5×3.2 =25×0.5×0.4×8 =25×8×0.5×0.4 =200×0.2 =40

原式 =0.5x0.3x0.12+0.5x1 =0.5x0.036+0.5x1 =0.5x(0.036+1) =0.5x1.036 =0.518

12.5乘括号20减0.8 =12.5*20-12.5*0.8 =250-10 =240

3.2*12.5*0.25 =4*0.8*12.5*0.25 =(4*0.25)*(0.8*12.5) =1*10 =10

16点5×0点25的12.5×0点25的简便算法怎么 16.5*0.25+12.5*0.25 =0.25*(16.5+12.5) =0.25*30-0.25*1 =7.25

0.8×0.25×0.4×12.5=0.25×0.4×0.8×12.5=0.1×10=1

0.8×0.25×0.4×12.5 =(0.8×12.5)×(0.25×0.4) =10×0.1 =1 这是简便运算的。

5/17-0.3-0.7+12/17 =(5/17+12/17)-(0.3+0.7) =1-1 =0

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