Вычислите значение выражения: a) 14 9/13 - 1 5/13 + 12 11/13; б) 7 24/25 - 3 12/25 - 1 7/25; в) 17 7/10 + 3 9/10 - 17/10; г) 23 15/49 - 13 19/49 - 1 30/49.

a) 14 9/13 - 1 5/13 + 12 11/13 = 13 4/13 + 12 11/13 = 25 15/13 = 26 2/13

б) 7 24/25 - 3 12/25 - 1 7/25 = 4 12/25 - 1 7/25 = 3 5/25 = 3 1/5

в) 17 7/10 + 3 9/10 - 17/10 = 20 16/10 - 17/10 = 20 16/10 - 1 7/10 = 19 9/10

г) 23 15/49 - 13 19/49 - 1 30/49 = 22 64/49 - 13 19/49 - 1 30/49 = 9 45/49 - 1 30/49 = 8 15/49