Odpowiedź:
Zadanie 12
a) 7/10 - 1/2 = 7/10 - 5/10 = 2/10 = 1/2
b) 3/4 - 3/8 = 6/8 - 3/8 = 3/8
c) 2/3 - 7/27 = 18/27 - 7/27 = 11/27
Zadanie 13
a)
1/2 • 3/3 = 3/6
1/3 • 2/2 = 2/6
b)
3/4 • 7/7 = 21/28
1/7 • 4/4 = 2/28
c)
3/5 • 9/9 = 27/45
4/9 • 5/5 = 20/45
