Odpowiedź:
5/7 + 1/7 = 6/7
4/9 + 1 i 3/9 = 1 i 7/9
5 i 1/8 + 3 i 2/8 = 8 i 3/8
3 i 3/5 + 6 i 2/8 = 3 i 24/40 + 6 i 10/40 = 9 i 34/40 = 9 i 17/20