1) (2/5a + 3/5a) = 5/5a = 1/a2) (7/9a - 5/9a) = 2/9a3) (3/8c + 3/8c) = 6/8c = 3/4c4) (9/11b + 5/11b) + (4/11c + 6/11c) = 14/11b + 10/11c5) 11/13d - (8/13d + 4) = 3/13d - 46) 9/10n - (8/10n - 3) = 9/10n - 8/10n + 3 = 1/10n + 3.
1) (2/5a + 3/5a) = 5/5a = 1/a
2) (7/9a - 5/9a) = 2/9a
3) (3/8c + 3/8c) = 6/8c = 3/4c
4) (9/11b + 5/11b) + (4/11c + 6/11c) = 14/11b + 10/11c
5) 11/13d - (8/13d + 4) = 3/13d - 4
6) 9/10n - (8/10n - 3) = 9/10n - 8/10n + 3 = 1/10n + 3.