) Oblicz :
2/5 + 4/5 = b) 14/5 + 22/5 = c) 35/6 + 21/6 = d) 4/5 - 1/5 =

3/4 - 2/4 = f) 22/3 - 11/3 = g) 32/5 - 23/5 = h) 1 - 1/3 =

21/4 - 3/4 = j) 31/3 - 12/3 = k) 53/7 - 24/7 =