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12.5×6.4怎样简便运算

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12.5*6.4 =12.5*8*0.8 =100*0.8 =80

0.4*4*4*0.25*12.5=0.4*(4*0.25)*(4*12.5)

6.4×1.25×12.5 =8×1.25×0.8×12.5 =10×10 =100

6.4x12.5x25 =8x0.8x12.5x25 =(8x12.5)x(0.8x25) =100x20 =2000

12.5×6.4-0.25×2.4 =12.5×0.8×8-0.25×4×0.6 =10×8-1×0.6 =80-0.6 =79.4

你把他们都变成分数再相乘,分母分子很好消掉 也就是32/5 * 1/4 * 25/2 = 2

40.8÷12.5÷8=40.8÷(12.5×8)=40.8÷20=2.04; (6.4-4.8)÷2.5=(6.4-4.8)×10÷4=64÷4-48÷4=16-12=4

12.5*6.4 =2.5*5*0.4*16 =2.5*0.4*5*16 =1*5*16 =80

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