Poziom B
a) 1/2 + 1/3 = 3/6 + 2/6 = 5/6
b) 3/4 - 2/5 = 15/20 - 8/20 = 7/20
c)5/8 + 1/7 = 35/56 + 8/56 = 43/56
d)5/6 - 3/7 = 35/42 - 18/42 = 17/42
e) 2/7 + 1/5 = 10/35 + 7/35 = 17/35
f) 7/8 - 2/3 = 21/24 - 14/24 = 7/24
g) 1/9 + 1/7 = 7/63 + 9/63 = 16/63
h) 3/5 - 1/3 = 9/15 - 5/15 = 4/15
i) 7/9 - 3/4 = 28/36 - 27/36 = 1/36
