Odpowiedź:
a) = 6/14 - 1/14 = 5/14
b) = 3/20 + 4/20 = 7/20
c) = 10/15 + 3/15 = 13/15
d) 9/12 - 4/12 = 5/12
e) 28/35 + 20/35 = 48/35 = 1 i 13/35
f) 12/24 - 8/24= 4/24=1/6
g) 45/54 + 6/54 = 51/54
h) 36/108 - 36/108 = 0
i) 3 i 5/35 + 2 i 7/35 = 5 12/35
j) 10 i 12/22 - 3 i 4/22 = 13 i 16/22
