8:3.6
=8/3.6
=(8/0.4)/(3.6/0.4)
=20/9
36:48
=(36/12)/(48/12)
=3/4
3/8:5/4
=(3/8)*8/(5/4)*8
=3/10
60厘米:4/5米
=0.6米/0.8米