Odpowiedź:
3/4 + 4/7 = 21/28 + 16/28 = 37/28 = 1 i 9/28
6 i 7/9 - 2 i 1/4 = 6 i 28/36 - 2 i 9/36 = 4 i 19/36
10 i 1/9 - 3 i 7/9 = 9 i 10/9 - 3 i 7/9 = 6 i 3/9 = 6 i 1/3
5 i 6/7 + 2 i 5/6 = 5 i 36/42 + 2 i 35/42 = 7 i 71/42 = 8 i 29/42
9 i 1/4 - 6 i 6/7 = 9 i 7/28 - 6 i 24/28 = 8 i 35/28 - 6 i 24/28 = 2 i 11/28