Question

Resolva as expressões: a. -13-(9-23)+(-42-35)-(-8+15). b. -4+6+{-25+21+[-2+(-3+5)]}.

Answer 1

 a. -13-(9-23)+(-42-35)-(-8+15) =
     -13-( -14 )+(  -77   )-(   +7  ) =
     -13 +14 -77 -7 =
     +14 -97 =
      -83 

b. -4+6+{-25+21+[-2+(-3+5)]} =
       +2+{-25+21+[-2+(  +2 )]} =
       +2+{   -4     +[-2   +2    ] } =
       +2 -4 =
       -2