69×40×80×0.25×0.01×0.125×100
=(80x0.125)x(40x0.25)x69x(0.01x100)
=10x10x69x1
=6900
原:
=69×(40×0.25)×(80×0.125)×(0.01×100)
=69×1×10×1
=690
69×40×80×0.25×0.01×0.125×100
=69×(40×0.25)×(80×0.125)×(0.01×100)
=69×10×10×1
=6900
乘法交换律,因为0.125*80=10
0.25*40=10
所以原式=69*(40*0.25)*(80*0.125)*(0.01*100)
=69*10*10*1=6900