Odpowiedź:
a) 1/7 + 5/14 = 2/14 + 5/14 = 7/14
b) 3/4 + 5/12 = 9/12 + 5/12 = 14/12 = 1 2/12
c) 8/9 - 5/18 = 16/18 - 5/18 = 11/18
d) 1/3 + 3/4 = 4/12 + 9/12 = 13/12 = 1 1/12
e) 3/5 - 1/2 = 6/10 - 5/10 = 1/10
f) 1 1/2 - 1/3 = 3/2 - 1/3 = 9/6 - 2/6 = 7/6 = 1 1/6
g) 1 1/2 + 3/8 = 3/2 + 3/8 = 12/8 + 3/8 = 15/8 = 1 7/8
h) 1 1/3 - 2/9 = 4/3 - 2/9 = 12/9 - 2/9 = 10/9 = 1 1/9
i) 2 3/5 - 7/10 = 13/5 - 7/10 = 26/10 - 7/10 = 19/10 = 1 9/10
j) 5/6 - 1/4 = 10/12 - 3/12 = 8/12
k) 1 1/6 - 7/9 = 7/6 - 7/9 = 21/18 - 14/18 = 7/18
l) 2 3/8 - 1 5/6 = 19/8 - 11/6 = 57/24 - 44/24 = 13/24
