Respostas

2013-11-04T23:09:01-02:00
A) 2x + 1 = 5 . 8
2x = 39
x = 39 / 2
  
b) 7 - x + 1 = 1 / 343
2401 - 343x + 343 = 1
- 343x = - 2744 (- 1 )
343x = 2744 
x = 8

c) 0,1x + 4 = 0,001  ( * 1000)
100x + 4000 = 1
100x = - 3999
x =39,99 
1 3 1