9. a ) 3/7 + 2/7 =
b) 5/8 + 6/8 =
c) 2 i 5/9 + 2/9 =
d) 2 i 4/5 + 3 i 3/5 =
e) 16/17 - 9/17 =
f) 5 i 12/21 =
g) 8 - 4/9
h) 3 i 1/8 - 1 i 7/8​