Odpowiedź:
1 i 1/5 + 2 i 2/5 = 3 i 3/5
3 i 7/17 + 2 i 3/17 = 5 i 10/17
4 i 2/21 + 1 i 5/21 = 5 i 7/21 = 5 i 1/3
7 i 4/5 - 1/5 = 7 i 3/5
6 i 11/12 - 4/12 = 6 i 7/12
4 i 3/10 - 2/10 = 4 i 1/10
11 i 9/8 - 6/8 = 11 i 3/8
1 - 1/2 = 2/2 - 1/2 = 1/2
1 - 3/5 = 5/5 - 3/5 = 2/5