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0.8×4×12.5×2.5

0.8×4×12.5×2.5 =(0 .8*12.5)*(4*2.5) =10*10 =100 使用乘法交换律 谢谢采纳

12.5×(0.4+0.8)×2.5 =12.5×(0.4×2.5+0.8×2.5) =12.5×(1+2) =12.5×3 =37.5 望采纳 谢谢

原式=(4x2.5)x(0.8x12.5) =10x10 =100 满意望采纳 谢谢

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

0.8×0.25×0.4×12.5 =(0.8×12.5)×(0.25×0.4) =10×0.1 =1 这是简便运算的。

12.5×(0.8+4)×2.5 =12.5×0.8×2.5+12.5×4×2.5 =10x2.5+12.5x10 =25+125 =150

12.5x2.5x0.8x4 =(12.5x0.8)x(2.5x4) =10x10 =100

(1)0.8×4×2.5×12.5 =(0.8×12.5)×(4×2.5)=10×10=100; (2)4.3×7+4.3×2+4.3=4.3×(7+2+1)=4.3×10=43.

12.5*0.8*2.5*4 =10*10 =100

(1)4×0.8×2.5×12.5,=(4×2.5)×(0.8×12.5),=10×10,=100;(2)(6.4×12.5×0.5)÷(1.6×2.5×0.2),=(0.8×8×12.5×0.5)÷(0.4×4×2.5×0.2),=[(0.8×12.5)×(8×0.5)]÷[(0.4×2.5)×(4×0.2)],=[10×4]÷[1×0.8],=40÷0.8,=50;(3)7....

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