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7,9-2 3/20=7,9-2 15/100=7,9-2,15=5,75 (inaczej 5 3/4, nie wiem jak ma być podany wynik)
1 1/10+2/3= 11/10+2/3=33/30+20/30=53/30=1 23/30
7/10+1 5/6=21/30+55/30=76/30=2 16/30=2 8/15