а) 2/9 + 6/9 - 3/9 = 5/9
б) 8 (целых) 25/27 - (3 (целых) 8/27 + 2 (целых) 3/27 = 8 + 25/27 - (3 + 8/27 + 2/27) = 8 + 25/27 - 5 = 7 22/27
в) (8 3/17 - 7 15/17) + 3 16/17 = 8 + 3 - 7 + (3/17 - 15/17 + 16/17) = 4 + 4/17
а) 2/9 + 6/9 - 3/9 = 5/9
б) 8 (целых) 25/27 - (3 (целых) 8/27 + 2 (целых) 3/27 = 8 + 25/27 - (3 + 8/27 + 2/27) = 8 + 25/27 - 5 = 7 22/27
в) (8 3/17 - 7 15/17) + 3 16/17 = 8 + 3 - 7 + (3/17 - 15/17 + 16/17) = 4 + 4/17