Odpowiedź:
a) = 3/4 + 2/4 = 5/4 = 1 1/4
b)= 3/10 + 5/10= 7/10
c) = 8/14 - 1/14 = 7/14 = 1/2
d) = 7/12 + 9/12 = 16/12 = 1 4/12 = 1 1/3
e) = 6/15 + 7/15 = 13/15
f) 3/8 + 3/4 = 3/8 + 6 /8 = 9/8 = 1 1/8
g) = 6/9 - 5/9 = 1 /9
h) = 8/20 - 7/20 = 1/20
i) 16/20 - 3/20 = 13 /20
