1. Выполните действие:

a) 11/40 + 15/22 = 121/880 + 600/880 = 721/880. b) 1 - 4/35 - 2/13 = 455/455 - 52/455 - 70/455 = 333/455. c) 2/5 * 11/3 * 1/18 = 22/270 = 11/135. d) 2 5/24 * 8 = 53/24 * 8 = 424/24 = 17 16/24 = 17 2/3. Ответы: a) 721/880; b) 333/455; c) 11/135; d) 17 2/3.