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12.5×0.4×2.5×8

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

12.5*0.4*2.5*8 =(12.5×8)(0.4×2.5) =10×1 =10

解:原式=(2.5×4)×(12.5×0.8) =10×10 =100

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

76

第一题(2.5*0.4+2.5*4*2)*12.5

原式 =(12.5x0.8)x(0.5x0.4) =10x0.2 =2

怎么算都挺简便的啊 2.5*8可以先算2*8再算5*8,因为有一位小数,5*8的结果要点一位小数点,40就变成了4.0,再加上2*8的结果就是20 同样的道理去算12.5*4就得到48+2等与50 50+20=70 或者你拆分一下,2.5*8拆分成2.5*2*4,12.5*4拆分成12.5*2*2,这...

(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.

. 4×0.8×2.5×12.5 =(4×2.5)×(0.8×12.5) =10×10 =100

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