1) 3/5 = 18/30 и 5/6 = 25/30 2) 11/24 = 55/120 и 1/30 = 4/120
6/11 = 54/99 и 4/9 = 44/99 11/18 = 22/36 и 7/12 = 21/36
5/6 = 25/66 и 4/11 = 24/66 4/21 = 16/84 и 13/28 = 39/84
7/18 = 7/18 и 1/6 = 3/18
9/13 = 45/65 и 4/5 = 52/65
5/7 = 20/28 и 3/4 = 21/28