2 2/5:2/3,
5/9:4 1/6,
5/6:3 1/3,
2 1/2:1 2/3,
3 1/2:1 3/4,
2 2/5:1 1/5,
5 2/5:1 1/9,

2 2/5:2/3 = 12/5 : 2/3 = 12/5 × 3/2 =18/5 = 3 3/5 = 3,65/9:4 1/6 = 5/9 : 25/6 = 5/9 × 6/25 = 2/155/6:3 1/3 = 5/6 : 10/3 = 5/6 × 3/10 =  1/4 = 0,252 1/2:1 2/3 = 5/2 : 5/3 =  5/2 × 3/5 = 3/2 = 1 1/2 = 1,5 3 1/2:1 3/4 = 7/2 : 7/4 = 7/2 × 4/7 =22 2/5:1 1/5 = 12/5 : 6/5 = 12/5 × 5/6 =2 5 2/5:1 1/9 = 27/5 : 10/9 = 27/5 × 9/10 = 243/50 = 4,86