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2/3 * 3/4 = 6/12 - oddała bratu
1 - 1/3 - 6/12 = 1 - 4/12 - 6/12 = 1 - 10/12 = 2/12 = 1/6 - pozostało dla koleżanki
3/4*2/3= 1/2
1-1/3-1/2=1-2/6-3/6=1/6