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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

12.5x3.2x2.5 =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。

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

2x1原式 =2.5x4)x(0.5x(4x0.5x3.25 =2.25 =(2.8x1.8)x1

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

您好: 25x12.5x3.2 =25x12.5x8x0.4 =(25x0.4)x(12.5x8) =10x100 =1000 如果本题有什么不明白可以追问,如果满意请点击“选为满意答案” 如果有其他问题请采纳本题后另发点击向我求助,答题不易,请谅解,谢谢。 祝学习进步!

(2.5+12.5)x3.2 =2.5x3.2+12.5x3.2 =2.5x4x0.8+12.5x8x0.4 =8+40 =48

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