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12.5x3.2x0.9怎样简便?

12.5x3.2x0.9怎样简便? 12.5x3.2x0.9 =12.5*8*0.4*0.9 =10*0.36 =3.6

(12.5X8)X(0.4X0.25)

12.5X3.2x0.25 =(12.5X0.8)x(4×0.25) =10×1 =10

12.5×3.2×2.5 =12.5×0.8×4×2.5 =(12.5×0.8)×(4×2.5) =10×10 =100

12.5×3.2 =12.5×0.8××4 =40

12.5x3.2x2.5 =12.5x8x0.4x2.5 =(12.5x8)x(0.4x2.5) =100x1 =100

12.5x3.2 解:简便脱式计算 =12.5x(8x0.4) =12.5x8x0.4 =100x0.4 =40 祝学习进步。

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