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1) (13/37 + 14/37) + 17/37 = 27/37 + 17/37 = 44/37 = 17/37; 2) 72/83 - 29/83 - 17/83 = 43/83 - 17/83 = 26/83; 3) 35/59 - 17/59 + 45/59 = 18/59 + 45/59 = 63/59 = 14/59.
1) (13/37 + 14/37) + 17/37 = 27/37 + 17/37 = 44/37 = 17/37; 2) 72/83 - 29/83 - 17/83 = 43/83 - 17/83 = 26/83; 3) 35/59 - 17/59 + 45/59 = 18/59 + 45/59 = 63/59 = 14/59.