Odpowiedź:
3/4 - 1/7 = 21/28 - 4/28 = 17/28
7/10 - 4/15 = 21/30 - 8/15 = 13/15
3/14 - 1/5 = 15/70 - 14/70 = 1/70
2 i 3/5 - 7/10 = 2 i 6/10 - 7/10 = 1 i 16/1 - 7/10 = 1 i 9/10
2 i 3/8 - 1 i 5/6 = 2 i 9/24 - 1 i 20/24 = 1 i 33/24 - 1 i 20/24 = 13/24
3 i 1/6 - 2 i 3/4 = 3 i 2/12 - 2 i 9/12 = 2 i 14/12 - 2 i 9/12 = 5/12