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3.2x1.25x2.5简便计算

3.2分成8乘0.4,用1.25乘8,再用4乘2.5,算出答案,就可以了!

解:采用拆分法和结合律, 原式=3.2x1.25x2.5 =0.8x4x1.25x2.5 =(2.5x4)x(1.25x0.8) =10x1 =10

=(2.5×4)×(0.8×1.25) =10×1 =10

4x0.8x1.25x2.5 =4x2.5x(8x1.25) =10x10 =100

3.2x1.25x2.5 =4x0.8x1.25x2.5 =(4x2.5)x(0.8x1.25) =10x1 =10

8x=1.25×3.2 8x=1.25×0.8×4 8x=4 x=1/2

2.5x3.2x1.25 =(2.5x4)x(0.8x1.25) =10x1 =10

3.2x25x1.25的简便计算 =4x0.8x25x1.25 =(4x25)x(0.8x1.25) =100x1 =100

2.5x3.2x1.25 =2.5x4×0.8x1.25 =10×1 =10

1.25X3.2 =1.25X8X0.4 =10X0.4 =4

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