Question

Resolver operación combinada de sumas y restas:
40 + {-6 + [-11 - (2 - 12) + 9] - 12} + 23

Answer 1

40+{-6+[-11-(-10)+9]-12}+23 
40+{-6+[-11+10+9]-12}+23
40+{-6+[+8]-12}+23
40+{-6+8-12}+23
40+{-10}+23
40-10+23
30+23
53