№ 299
15/36 = 5/12 = 25/60
42/45 = 14/15 = 56/60
25/100 = 1/4 = 15/60
9/30 = 3/10 = 18/60
№ 300
1/7 и 1/2 = 2/14 и 7/14
7/20 и 1/15 = 21/60 и 4/60
3/26 и 5/39 = 9/78 и 10/78
8/11 и 5/8 = 64/88 и 55/88
7/13 и 2/11 = 77/143 и 26/143
3/22 и 2/33 = 9/66 и 4/66
7/60, 13/540 и 9/20 = 63/540, 13/540 и 243/540
52/105, 7/95 и 61/63 =