a) 1/3 и 1/2 = 2/6 и 3/6
3/8 и 1/4 = 3/8 и 2/8
3/4 и 5/6 = 9/12 и 10/12
б) 2/5 и 3/4 = 8/20 и 15/20
8/9 и 2/3 = 8/9 и 6/9
1/6 и 5/9 = 3/18 и 10/18
в) 5/6 и 5/7 = 35/42 и 35/42
7/15 и 3/5 = 7/15 и 9/15
3/10 и 8/15 = 9/30 и 16/30
г) 9/10 и 2/9 = 81/90 и 20/90
5/18 и 4/9 = 5/18 и 8/18
3/8 и 5/12 = 12/24 и 10/24