5.282 Вычислите значение выражения:

а) 14 9/13 - 1 5/13 + 12 11/13 = (14 - 1 + 12) + (9/13 - 5/13 + 11/13) = 25 + 15/13 = 25 + 1 2/13 = 26 2/13

б) 7 24/25 - 3 12/25 - 1 7/25 = (7 - 3 - 1) + (24/25 - 12/25 - 7/25) = 3 + 5/25 = 3 1/5

в) 17 7/40 + 3 9/40 - 17/40 = (17 + 3) + (7/40 + 9/40 - 17/40) = 20 + (-1/40) = 19 39/40

г) 23 15/49 - 13 19/49 - 30/49 = (23 - 13) + (15/49 - 19/49 - 30/49) = 10 + (-34/49) = 9 15/49