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求“0.8 x 0.25 x 0.4 x 12.5 =”的简便运算

0.8*0.25*0.4*12.5=(0.4*12.5)*(0.25*0.4)=10*0.1=1

0.8*0.25*0.4*12.5=(0.8x12.5)x(0.25x0.4)=10x0.1=1

0.8和12.5先乘再0.4和0.25乘

4/5x 1/4x 2/5x 5/4x 10

=(0.8*12.5)*(0.25*0.4)=10*0.1=1

0.8乘0.25乘0.4乘12.5=0.8*12.5*(0.25*0.4)=10*0.1=1

0.8*12.5*0.4*0.25=10*1=10

(0.8*12.5)*(0.4*0.25)

0.8*0.25*0.4*12.5=0.25*0.4*0.8*12.5=0.1*10=1

0.8x0.25 x0.4 x12.5=(0.8x0.25) x(0.4 x12.5)=0.2x0.05=0.01

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