Odpowiedź:
2 i 5/6 + 1 i 3/7 = 2 i 35/42 + 1 i 18/42 = 3 i 53/42 = 4 i 11/42
6 i 5/8 - 3 i 1/5 = 6 i 25/40 - 3 i 8/40 = 3 i 17/40
4 i 2/7 - 2 i 4/9 = 4 i 18/63 - 2 i 28/63 = 3 i 81/63 - 2 i 28/63 = 1 i 53/63
7/12 * 4/5 = 7/15
3/5 : 9/20 = 3/5 * 20/9 = 4/3 = 1 i 1/3
5 i 1/2 * 4 i 2/3 = 11/2 * 14/3 = 77/3 = 25 i 2/3