Odpowiedź:
1/3 + 3/4 = 4/12 + 9/12 = 13/12 = 1 i 1/12
2/3 + 6/7 = 14/21 + 18/21 = 32/21 = 1 i 11/21
7/8 + 5/6 = 21/24 + 20/24 = 41/24 = 1 i 17/24
5 i 1/4 + 5/6 = 5 i 3/12 + 10/12 = 5 i 13/12 = 6 i 1/12
1 i 7/9 + 2 i 3/10 = 1 i 70/90 + 2 i 27/90 = 3 i 97/90 = 4 i 7/90
8/9 - 2/5 = 40/45 - 18/45 = 22/45
7/8 - 4/5 = 35/40 - 32/40 = 3/40
4 i 5/6 - 1/4 = 4 i 10/12 - 3/12 = 4 i 7/12
6 i 8/9 - 1 i 1/2 = 6 i 16/18 - 1 i 9/18 = 5 i 7/18
8 i 5/7 - 3 i 2/5 = 8 i 25/35 - 3 i 14/35 = 5 i 11/35
4 i 1/4 - 4 i 1/6 = 4 i 3/12 - 4 i 2/12 = 1/12
