10:15=10/15约=0.667
0.15:1.5=0.15/1.5=0.1
4.2:1.4=4.2/1.4=3
1/2:1/3=3/2=1.5
1/5:0.6=0.2/0.6=0.333
2/5:5/6=12/250.48
123:69=41:23
0.45:2=45:200=9:40
1/50:1/20=1/50X20=2:5
6:12/13=6X13/12=13:2 3/4:1/12=3/4X12=9:1
7.2:8.4=6:7
3.2:16/3=16/5X3/16=3:5
2/3:0.8=2/3X5/4=5:6
望采纳