Réponses

2014-02-01T19:13:30+01:00
Bonsoir

a) 7-4x =11
   -4x = 11 -7
-4x = 4
x = -1

b) x-2 = 3x+4
x -3x = 4 +2
-2x = 6
x = - 6/2 = - 3

c) 5(x+1) - 3(x-2) =48

5x +5 - 3x +6 = 48
5x -3x = 48 -6 -5
2x = 37
x = 37/2
2014-02-01T19:17:20+01:00
A) 7-4x =11
 -4x = 11 -7       -4x = 4    x = 4/-4 = -1

b) x-2 = 3x+4
x-3x = 4 +2
-2x = 6     x = 6/-2   x = -3

c) 5(x+1) - 3(x-2) =48
5x +5 -3x + 6 = 48
2x = 48 -6 -5
2x =37
x = 37/2