Odpowiedź:
zad 11
3 i 3/8 - 5/8 = 2 i 11/8 - 5/8 = 2 i 6/8
2 i 3/7 - 4/7 = 1 i 10/7 - 4/7 = 1 i 6/7
8 i 2/5 - 4/5 = 7 i 7/5 - 4/5 = 7 i 3/5
6 i 5/9 - 8/9 = 5 i 14/9 - 8/9 = 5 i 6/9
zad 12
3 i 1/4 - 3/4 = 2 i 5/4 - 3/4 = 2 i 2/4 = 2 i 1/2
5 i 5/8 - 7/8 = 4 i 13/8 - 7/8 = 4 i 6/8 = 4 i 3/4
7 i 3/5 - 4/5 = 6 i 8/5 - 4/5 = 6 i 4/5
5 i 1/4 - 2 i 3/4 = 4 i 5/4 - 2 i 3/4 = 2 i 2/4 = 2 i 1/2
7 i 1/5 - 3 i 3/5 = 6 i 6/5 - 3 i 3/5 = 3 i 3/5
9 i 1/8 - 2 i 7/8 = 8 i 9/8 - 2 i 7/8 = 6 i 2/8 = 6 i 1/4
