по действиям
1)
5)

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1) 2 1/2 - 3 1/3 = 2 3/6 - 3 2/6 = -5/6 5) 3 9/6 - 4 11/24 = 3 36/24 - 4 11/24 = 4 12/24 - 4 11/24 = 1/24