3.2ch312.5ch30.25=0.8×4×12.5×0.25=0.8×12.5×4×0.25=10×1=10帮助你就是我的快乐，数学辅导团祝你学习进步，不理解请追问，理解请及时采纳！(*^__^*)
3.2*12.5*0.25=0.8*12.5*4*0.25=10*1=10
3.2*12.5*0.25=12.5*0.8*4*0.25=10
