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12.5*3.2*25的简便算法

原式 =12.5x(8x0.4)x25 =(12.5x8)x(0.4x25) =100x10 =1000 或者 =12.5x(0.8x4)x25 =(12.5x0.8)x(4x25) =10x100 =1000

12.5×3.2×25 =12.5×8×0.4×25 =(12.5×8)×(0.4×25) =100×10 =1000

12.5X3.2 =12.5X8X0.4 =100X0.4 =40

12.5×25×3.2 =2.5×5×25×4×0.8 =2.5×4×25×0.8×5 =10×20×5 =1000

解:采用拆分法, 原式=12.5+25x3.2 =12.5+25x4x0.8 =12.5+100x0.8 =12.5+80 =92.5

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

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

计算: 2.5×3.2×12.5 =2.5x4x0.8x12.5 =10x10 =100

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