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0.25x1.25✘0.4✘8 3.5✘103

原式=0.25*8*1.25+0.25*0.4*1.25=0.25*(8*1.25)+(0.25*0.4)*1.25=0.25+0.125=0.375

0.25x1.25x0.4x8=0.25x0.4x1.25x8(乘法交换律)=0.1x100=10

0.4*0.25 1.25*8

(0.25x0.4)x(1.25x8) 0.1x10=1

应用乘法交换律和结合律:8x0.25x1.25x0.4=(8*1.25)*(0.25*0.4)=10*0.1=1

0.25x1.25x8=0.25x(1.25x8)=0.25x10=2.5

1.25*8*0.25*0.4=10*0.1=1

1.25*(0.4+8)=1.25*0.4+1.25*8=0.5+10=10.5

3/1.25/0.4/0.25/8=3/(1.25*0.4*0.25*8)=3/(0.5*2)=3

1.25x0.4x0.25x810-0.45-0.55=1.25x(800+10)x0.4x0.25-(0.45+0.55)=1.25x(800+10)x0.4x0.25-(0.45+0.55)=1.25x(800+10)x0.1-1=0.125x800+0.125x10-1=100+1.25-1=100.25

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