Question

resolva
9+[5-(-3)+(-1-4)+(2-3)+1]

Answer 1

$9 + (5 + 3 + ( - 5) + ( - 1) + 1) \\ 9 + (8 - 5 - 1 + 1) \\ 9 + (3) \\ 9 + 3 = 12$