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4.8*12.5怎么简便

2.1乘12.5乘4.8,该怎么简便运算的

2.1×(12.5×4)×1.2=2.1×60=126

12.5x4.8 =12.5x8x0.6 =100x0.6 =60

4.8×0.5×12.5 =0.6×8×0.5×12.5 =(0.6×0.5)×(8×12.5) =0.3×100 =30

4.8×12.5=(5-2)×12.5=5×12.5-2×12.5=62.5-25=37.5

12-4.8×0.5 =12-12x0.4x0.5 =12x(1-0.4x.05) =12x0.8 =9.6

76.5-12.5×4.8 =76.5-12.5×8×0.6 =76.5-100×0.6 =76.5-60 =16.5

4.8×12.5×0.5 =(6×0.8)×12.5×0.5 =(6×0.5)×(0.8×12.5) =3×10 =30

(4.8-3.2)/12.5 =1.6/12.5 =1.6*8/100 =12.8/100 =0.128

0.32*12.5+4.8*1.25简便方法 0.32*12.5+4.8*1.25 =1.25*3.2+1.25*4.8 =1.25*(3.2+4.8) =1.25*8 =10

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