Question

{[40+2•(7-5)]•2-18}÷10

Answer 1

{[40+2•(7-5)]•2-18}÷10
{[42.2].-16}:10
{84.-16}:10
-1344:10
-134,4

Answer 2

{[40+2.2].2-18}:10
 {[40+4 ].2-18}:10
   {44.2-18}:10
     {88-18}:10 
       70:10
          7

espero ter ajudado