6. Oblicz:
a) 1 - 1/2 =
2 - 1/2 =
4 - 1/2 =

b) 1 - 3/5 =
4 - 3/5 =
6 - 3/5 =

c) 1 - 1/9 =
7 - 1/9 =
10 - 1/9 =​