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1/6 + 3/8= 4/24 + 9/24= 13/24 prawe na drugim poziomie.
5/12 + 13/24 = 10/24 + 13/24= 23/24 na górze
b) 1/4 + 3/7= 7/28 + 12/28 = 19/28 lewy drugi poziom
10/14 - 3/7= 5/7-3/7=2/7 prawy na dole
19/28 + 10/14 = 19/28 + 20/28 = 39/28 = 1 11/28 góra