先最简化:25/60=5/1230/70=3/79/27=1/3再通分:25/60=5/12=5X7/12X7=35/8430/70=3/7=3X12/7X12=36/849/27=1/3=7X4/3X7X4=28/84按照从大到小排列为:30/70>25/60>9/27
25/60=5/12=35/84;30/70=3/7=36/84;9/27=1/3=28/8430/70>25/60>9/27