解由1.2×1.25÷1.2×0.8=6/5×1.25÷6/5×0.8=6/5×1.25×5/6×0.8=6/5×5/6×1.25×0.8=1×1.25×0.8=1
原式=1.25X0.8=0.1
1.2/1.2*1.25*0.8=1