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Zad.2. 6 1/7 - 2 2/5 = 6 5/35-2 14/35= 5 40/35-2 14/35=3 26/35
Zad.3. 2 1/5*1,5= 11/5*3/2=33/10=3 3/10
Zad.4. 5,5: 2 3/4= 11/2:11/4=11/2*4/11=2