Odpowiedź:
5 i 2/7 + 1 i 3/7 - 1/7 = 6 i 5/7 - 1/7 = 6 i 4/7
4 i 5/9 - 2 i 4/9 + 3 i 2/9 = 2 i 1/9 + 3 i 2/9 = 5 i 3/9 = 5 i 1/3
2 i 2/3 - (4 i 2/3 - 3 i 1/3) = 2 i 2/3 - 1 i 1/3 = 1 i 1/3
7 i 8/9 - ( 1 i 4/9 + 2 i 3/9) = 7 i 8/9 - 3 i 7/9 = 4 i 1/9
3 i 1/5 + 5 i 3/5 - 2 i 2/5 = 8 i 4/5 - 2 i 2/5 = 6 i 2/5
11 i 5/7 - 3 i 2/7 - 4 i 3/7 = 8 i 3/7 - 4 i 3/7 = 4
