Odpowiedź:
zad 26
a) 1 4/7 + 6/7 = 1 10/7 =2 3/7
b) 2 1/4 +1 2/5 = 2 5/20 + 1 8/20 = 3 13/20
c) 1 2/15 - 4/15 = 17/15 - 4/15 = 13/15
d) 5 3/5 -2 3/10 = 5 6/10 - 2 3/10 = 3 3/10
zad 27
a) 1 2/5 + 1/8 = 1 16/40 + 5/40 = 1 21/40
b) 4 3/5 + 2 2/3 = 4 9/15 + 2 10/15 = 6 19/15 = 7 4/15
c) 5 3/5 - 1 1/4 = 5 12/20 - 1 5/20 = 4 7/20
d) 5 2/5 - 3 7/10 = 5 4/10 - 3 7/10 = 4 14/10 - 3 7/10 =1 7/10
