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2. 4 1/2 + 2/3 - 2 3/4 = 4 3/6 + 4/6 = 4 7/6 = 5 1/6 - 2 3/4= 5 2/12 - 2 9/12 = 4 14/12 - 2 9/12 = 2 5/12
3. 2,5 . 75% - 2/5 = 2 1/2 . 3/4 = 2 4/6 - 2/5 = 2 10/15 - 6/15= 2 4/15