Odpowiedź:
17/20 - 9/20 = 8/20
49/50 - 33/50 = 16/50
7 i 4/5 - 5 i 3/5 = 2 i 1/5
2 i 8/15 - 1 i 8/15 = 1
9 i 7/30 - 6 = 3 i 7/30
10 i 4/13 - 7 i 1/13 = 3 i 3/13
a) ⅖
b). 16
----------
50
c). 2 ⅕
d) 1
e) 7
3 -----
30
f). 3
3 ------
13
