Odpowiedź:
b) 3 i 6/7 + 1 i 3/7 = 4 i 9/7 = 5 i 2/7
c) 5 i 5/8 + 2 i 3/8 = 8
d) 5 i 4/9 + 7 i 7/9 = 12 i 11/9 = 13 i 2/9
