Question

{30+[10-5+(-2-3)] -18-12}​

Answer 1

Vamos lá,

30+10−5−2−3−18−12

30+5−2−3−18−12

30+5+−5−18−12

30+0−18−12

30−18−12

12−12

0

Answer 2

{30+[10-5+ (-5) ] - 18 -12}

{30+0 - 18 -12}

{30+(- 18) -12}

12-12

0