Odpowiedź:
1/6 + 2/5 = 5/30 + 12/30 = 17/30
8/9 - 5/6 = 16/18 - 15/18 = 1/18
1 i 1/5 + 8 i 1/7 = 1 i 7/35 + 8 i 5/35 = 9 i 12/35
4 i 7/10 - 2 i 1/3 = 4 i 21/30 - 2 i 10/30 =2 i 11/30
4 i 1/5 - 7/10 = 4 i 2/10 - 7/10 = 3 i 12/10 - 7/10 = 3 i 5/10 = 3 i 1/2
6 i 1/8 - 2 i 3/4 = 6 i 1/8 - 2 i 6/8 = 5 i 9/8 - 2 i 6/8 = 3 i 3/8
10 i 2/3 - 6 i 7/9 = 10 i 6/9 - 6 i 7/9 = 9 i 15/9 - 6 i 7/9 = 3 i 8/9
9 i 3/8 - 2 i 5/6 = 9 i 9/24 - 2 i 20/24 = 8 i 33/24 - 2 i 20/24 = 6 i 13/24
