Odpowiedź:
zad 4
a) 3 3/10 + 1/2 = 3 3/10 + 5/10 = 3 8/10 = 3 4/5
b) 1 1/5 + 1/2 = 1 2/10 + 5/10 = 1 7/10
c) 2 2/7 + 1/2 = 2 4/14 + 7/14 = 2 11/14
d) 1 7/6 + 2/3 = 1 7/6 + 4/6 = 1 11/6 = 2 5/6
e) 2 5/6 + 2/3 = 2 5/6 + 4/6 = 2 9/6 = 3 3/6 = 3 1/2
f) 1 3/10 + 2/3 = 1 9/30 + 20/30 = 1 29/30
zad 6
a) 1/2 - 1/3 = 3/6 - 2/6 = 1/6
b) 3/4 - 2/3 = 9/12 - 8/12 = 1/12
c) 1/3 - 1/5 = 5/15 - 3/15 = 2/15
d) 4/6 - 2/9 = 12/18 - 4/18 = 8/18 = 4/9
e) 3/4 - 1/6 = 9/12 - 2/12 = 7/12
f) 5/8 - 1/4 = 5/8 - 2/8 = 3/8
