2/7：5/28
=2/7÷ 5/28
=2/7x28/5
=8/5
1.5：1/3
=1.5x3
=4.57/9:0.12 3/5:2/3 6:2/37/8:3/4 7/8:0.75 3/7:2/9快点 答完我就采纳拜托！7/9:0.12=175/273/5:2/3=9/106:2/3=97/8:3/4=7/67/8:0.75=7/63/7:2/9=27/14