Odpowiedź:
Zad. 8
b)
1/2 = 7/14
3/7 = 6/14
1/2 - 3/7 = 7/14 - 6/14 = 1/14
Zadanie 9
a)
1/4 = 3/12
2/3 = 8/12
6 i 1/4 + 5 i 2/3 = 6 i 3/12 + 5 i 8/12 = 11 i 11/12
3/5 = 21/35
1/7 = 5/35
4 i 3/5 - 2 i 1/7 = 4 i 21/35 - 2 i 5/35 = 2 i 16/35
