Odpowiedź:
a) 1/6 + 2/5 = 5/30 + 12/30 = 17/30
b) 8/9 - 5/6 = 16/18 - 15/18= 1/18
c)1 1/5 + 8 1/7 = 1 7/35 + 8 5/35= 9 12/35
d) 4 7/10 - 2 1/3= 4 21/30 - 2 10/30 = 2 11/30
e) 4 1/5 - 7/10= 4 2/10 - 7/10 = 3 9/10
f) 6 1/8 - 2 3/4 = 6 1/8 - 2 6/8 = 3 5/8
g) 10 2/3 - 6 7/9 = 10 12/18 - 6 14/18 = 3 8/18
h) 9 3/8 - 2 5/6= 9 9/24 - 2 20/24= 6 13/24
