А)10/35 и 6/8 = 2/7 и 3/4 = 8/28 и 21/28;
б)14/42 и 150/160 = 7/21 и 75/80 = 1/3 и 15/16 = 16/48 и 45/48;
в)45/400, 45/225 и 72/144 = 9/80, 15/75 и 24/48 = 9/80, 5/25 и 12/24 = 9/80, 1/5 и 6/12 = 9/80, 1/5 и 3/6 = 9/80, 1/5 и 1/2 = 9/80, 16/80 и 40/80.