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12.5x3.2x0.9怎样简便?

(12.5X8)X(0.4X0.25)

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

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

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

12.5X2.5X3.2=12.5X2.5X4x0.8=(12.5x4)x(2.5x0.8)=50x2=100

=12.5÷1.25x3.2 =10x3.2 =32

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

47.5×2.3+3.4x52.5+7.5x1.1 =47.5×2.3+(2.3+1.1)x52.5+7.5x1.1 =47.5×2.3+2.3×52.5+1.1x52.5+7.5x1.1 =2.3×(47.5+52.5)+1.1×(52.5+7.5) =2.3×100+1.1×60 =230+66 =296

(2)7.2X(36.3-16.3) (3)100X0.57+2X0.57

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