Odpowiedź:
2 i 1/5 + 3 i 9/10 = 2 i 2/10 + 3 i 9/10 = 5 i 11/10 = 6 i 1/10
1 i 8/9 + 5 i 4/7 = 1 i 56/63 + 5 i 36/63 = 6 i 92/63 = 7 i 29/63
7 i 1/15 + 5 i 13/30 = 7 i 2/30 + 5 i 13/30 = 12 i 15/30 = 12 i 3/6 = 12 i 1/2
7 i 5/6 + 2 i 2/9 = 7 i 15/18 + 2 i 4/18 = 9 i 19/18 = 10 i 1/18
