Odpowiedź :
zad 1
1 6/7 + 5/7 = 1 11/7 = 2 4/7
1 1/3 + 2 5/8 = 1 8/24 + 2 15/24 = 3 23/24
1 2/13 - 9/13 = 15/13 - 9/13 = 6/13
5 5/8 - 3 1/2 = 5 5/8 - 3 4/8 = 2 1/8
zad 2
a). 11/7
b). 1/3
c). 4 4/9
zad 3
51 3/5 - 7 1/4 = 51 12/20 - 7 5/20 = 44 7/20
zad 4
3 1/3 : 1/3 = 10/3 : 1/3 = 10
zad 5
4/ 18
zad 6
(3/7 - 1/3) : (1 + 1/3) = (9/21 - 7/21) : (1 + 7/21) = 2/21 : 1 7/21 = 2/21 * 21/28 = 1/14
zad 7
15 * 4 2/3 = 15 * 14/3 = 70
1 1/3 * 3 3/4 = 4/3 * 15/4 = 5
3 3/4 : 12 = 15/4 * 1/12 = 5/16
7 1/3 : 1 4/7 = 22/3 : 11/7 = 22/3 * 7/11 = 14/3 = 4 2/3