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b)
c)
5 2/3 - 2 1/4 = 5 8/12 - 2 3/12 = 3 5/12.
4 3/10 - 2 1/5 = 4 15/50 - 2 10/50 = 2 5/50 = 2 1/10.
Liczę na najj :)