12:1 1/5 = 12:1,2 = 10:1 0,8:1,6 = 1:2 2 1/6:4 1/3 = 13/6:13/3 = 1:2 5,6:14,4 = 7:18 4/15:2/3 = 4/15:10/15 = 4:10 = 2:5 12,3:1,23 = 10:1