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Po prostu sprowadziłem do takiego samego mianownika
ZADANIE 2.
5 7/12 + 11/12 + 9/20 = 5 18/12 + 9/20 = 6 1/2 + 9/20 = 6 10/20 + 9/20 = 6 19/20
ZADANIE 5.
1- 6/13 = 7/13
ZADANIE 8.
2 3/4 *16= 11/4 * 16/1 = 11/1 * 4/1 = 44/1 = 44
ZADANIE 17
wynik= 1 , bo kazda liczba podniesiona do potegi 0 daje 1