Question

13+{15-(12-54)-[(-4-6)+9]-23}

Answer 1

13+{15-(-42)-[(-10)+9]-23}=

13+{15+42-[-10+9]-23}=

13+{15+42-[-1]-23}=

13+{15+42+1-23}=

13+{57-22}=

13+35=

48

Answer 2

13+{15-(12-54)-[(-4-6)+9]-23}

Primeiro resolver o que esta dentro dos parêntesis.

13+{15-(-42)-[(-10)+9]-23}
13+{15-(-42)-[(-10)+9]-23}
13+{15-(-42)-[-1]-23}
13+ {15 + 42 + 1 - 23}
13 + {15 + 20}
13 + 35
=> 48