8×1.4×0.5×0.125
=8×0.125×0.7×2×0.5
=1×0.7×1
=0.7什么意思8×0.125=11.4=2×0.72×0.5=18×1.4×0.5×0.125=(8×0.125)×(0.7×2)×0.5=1×0.7×(2×0.5)=1×0.7×1=0.7