a) 9/7) + (a/b) = 17/7 ⇒ a/b = 17/7 - 9/7 = 8/7
b) (a/b) +(3/5) = 23/15 ⇒ a/b = 23/15 - 3/5 = 23/15 - (9/15) = 14/15
c) 3/4) + (a/b) = 23/24 ⇒ a/b = (23/24) - (3/4) = (23/24) - (18/24) = 5/24
d) (9/7) - (a/b) = 1/7 ⇒ a/b = 9/7) - (1/7) = 8/7
e) (5/8) - a/b = 3/40 ⇒ a/b = (5/8) - (3/40) = 25/40) - 3/40 = 22/40 = 11/20
f) (14/4) .... 5/2 = 1 ⇒ (14/4) - 5/2 = 14/4 - 10/4 = 4/4 = 1