Réponses

2014-04-06T13:26:25+02:00
bonjour,
Ex3 :
a) 2x -4=3 -5x
    2x +5x = 3 +4
    7x =7
    x = 7/7
    x = 1        
b) x -2 = 5x -4
    x -5x = -4 +2
    -4x = -2
     x = 2/4
     x= 1/2
Ex4:
a) x+5= 4x+3
    x -4x = 3 -5
    -3x = -2
       x=2/3
b) 30 +5t = 2- 2t
 5t +2t = 2-30
7t = 28
t=28/7
t= 4