1 + (1 2) - 3 + 4 - 5 = 11 + (1 2) - 3 + 4 5 + 6 = 11 + 1 2 - 3 + 4 5 + 6 = 1(1 1 2) - 3 + 4 5 + 6 = 11 + 1 2 - 3 + 4 - 5 + 6 7 - 8 = 1
1 + (1 2) - 3 + 4 - 5 = 1
1 + (1 2) - 3 + 4 5 + 6 = 1
1 + 1 2 - 3 + 4 5 + 6 = 1
(1 1 2) - 3 + 4 5 + 6 = 1
1 + 1 2 - 3 + 4 - 5 + 6 7 - 8 = 1