(2.5×8.8-2.5×0.8)×1.25
=(2.5×0.8×11-2.5×0.8)×1.25
=[2.5×0.8×(11-1)]×1.25
=(2.5×0.8×10)×1.25
=(2.5×10)×(0.8×1.25)
=25×1
=25
原式
=2.5x(8.8-0.8)x1.25
=2.5x8x1.25
=2.5x(8x1.25)
=2.5x10
=25
或者
=2.5x(8.8-0.8)x1.25
=2.5x8x1.25
=2.5x4x2x1.25
=10x2.5
=25
(2.5*8.8-2.5*0.8)*1.25
=2.5*(8.8-0.8)*1.25
=2.5*(8*1.25 )
=2.5*10
=25