Respostas

2013-10-28T13:00:53-02:00
A) 3+6-3=
    =6
b)-9-10-3
 = -22
 c) -1+12-3
   = 8
2013-10-28T13:20:17-02:00
A) x + y - 3                                            c) x + y - 3
                                                                - 1 + 12 - 3   
    3 + 6 - 3                                                  11 - 3 = 8

     9 - 3 = 6

b) x + y - 3
( - 9 ) + ( - 10 ) - 3
- 9 - 10 - 3
- 19 - 3 = - 22