Odpowiedź:
1/6 * 20 = 10/3 = 3 i 1/3
3/5 * 30 = 18
2 i 3/4 * 20 = 11/4 * 20 = 55
1/7 * 10 = 1 i 3/7
3/5 * 18 = 54/5 = 10 i 4/5
2 i 1/3 * 20= 7/3 * 20 = 140/3 = 46 i 2/3
zad 2
3/4 tuzina = 3/4 * 12 = 9
3 i 2/3 tuzina = 3 2/3 * 12 = 11/3 * 12 = 44
7/10 kopy = 7/10 * 60 = 42
5 i 1/5 kopy = 5 i 1/5 * 60 = 26/5 * 60 = 312
