Ćwiczenie 8/40
1 - 1/5 = 4/5
2 - 1/5 = 1 4/5
6 - 1/5 = 5 4/5
1 - 4/7 = 3/7
2 - 4/7 = 1 3/7
7 - 4/7 = 6 3/7
3 - 5/11 = 2 6/11
5 - 5/11 = 4 6/11
8 - 5/11 = 7 6/11
5 - 2 4/9 = 2 5/9
12 - 2 4/9 = 9 5/9
20 - 2 4/9 = 17 5/9
Ćwiczenie 9/40
3 2/5 = 2 7/5
5 + 2 = 7
4 3/8 = 3 11/8
8 + 3 = 11