Respostas

2014-05-24T16:11:04-03:00
- 9 +  (-6) - (-3)

-9 - 6 + 3

12
2014-05-24T17:08:00-03:00
-9+(-4-3+1)-(-2-3+2)=
-9-4-3+1+2+3-2=
-9-4-3-2+1+2+3=
-18+6
-12