Odpowiedź:
4/5 + 1/6 = 24/30 + 5/30 = 29/30
1/8 + 1/3 = 3/24 + 8/24 = 11/24
2/3 + 1/5 = 10/15 + 3/15 = 13/15
2/5 + 3/5 = 5/5 = 1
3/7 - 5/14 = 6/14 - 5/14 = 1/14
5/10 - 1/2 = 5/10 - 5/10 = 0
4/8 - 3/9 = 36/72 - 24/72 = 12/72 = 6/36 = 1/6
5/15 - 1/3 = 5/15 - 5/15 = 0
7/10 - 5/10 = 2/10 = 1/5
