Odpowiedź:
zad 3
a)
1 2/9 = 11/9
1 1/4 = 5/4
b)
2 1/2 = 5/2
2 4/5 = 14/5
c)
3 3/4 = 15/4
2 5/9 = 23/9
d)
6 5/7 = 47/7
8 3/11 = 91/11
zad 4
a)
2 2/7 + 3 4/7 = 5 6/7
4 4/9 + 6 7/9 = 10 10/9 = 11 1/9
b)
5 - 3/8 = 4 8/8 - 3/8 = 4 5/8
8 - 2 3/5 = 7 5/5 - 2 3/5 = 5 2/5
c)
3 3/4 - 1/2 = 3 3/4 - 2/4 = 3 1/4
5 3/4 + 3 1/2 = 5 3/4 + 3 2/4 = 8 5/4 = 9 1/4
zad 5
a)
1 1/3 + 4/5 = 1 5/15 + 12/15 = 1 17/15 = 2 2/15
b)
2 5/7 + 1 3/8 = 2 40/56 + 1 21/56 = 3 61/56 = 4 5/56
c)
5/9 + 5/6 = 10/18 + 15/18 = 25/18 = 1 7/18
d)
2 3/10 + 3 3/4 = 2 6/20 + 3 15/20 = 5 21/20 = 6 1/20
e)
2 4/5 + 3/7 = 2 28/35 + 15/35 = 2 43/35 = 3 8/35
