№459
1) 3/5 и 5/6 = 18/30 и 25/30
2) 6/11 и 4/11 = 56/99 и 44/99
3) 5/6 и 4/11 = 55/66 и 24/66
4) 7/18 и 1/6 = 7/18 и 3/18
5) 9/13 и 4/5 = 45/65 и 52/65
6) 5/7 и 3/4 = 20/28 и 21/28
7) 2/15 и 1/3 = 2/15 и 5/15
8) 5/8 и 3/4 = 5/8 и 6/8
№461
1) 7/20 и 5/12 = 21/60 и 25/60
2) 11/24 и 1/30 = 55/120 и 4/120
3) 3/16 и 7/12 = 9/48 и 28/ 48
4) 11/18 и 7/12 = 22/36 и 21 /36
5) 1/12 и 2/9 = 3/36 и 8/36
6) 4/21 и 13/28 = 16/84 и 39/84
7) 8/15 и 5/12 = 32/60 и 25/60
8) 7/30 и 1/12 = 14/60 и 5/60