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12.5×3.2简便运算

12.5×3.2×2.5 =12.5×8×(0.4×2.5) =100×1 =100

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

12.5X3.2X2.5简便计算 解: 12.5X8X(0.4X2.5) =100X1 =100

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

12.5x3.2x0.25 =12.5x0.8x4x0.25 =10x1 =10

12.5×3.2 =125×8×0.4×0.1 =1000×0.04 =40

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

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

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