Odpowiedź:
a) 3/8 - 1/3 = 9/24 - 8/24 = 1/24
b) 5/9 - 1/10 = 50/90 - 9/90 = 41/90
c) 6/7 - 4/5 = 30/35 - 28/35 = 2/35
d) 8/9 - 4/7 = 56/63 - 36/63 = 20/63
