Réponses

2013-10-26T22:11:06+02:00
Bonsoir
4x+2(6-x)=3(x+9)
4x +12 -2x = 3x +27
4x -2x -3x = 27-12
-x = 15
x = -15
et
x/4=1/2+1/3

3x = 6 +4
3x = 10
x = 10/3


2013-10-26T22:15:57+02:00
A) 4x+(12-2x)=3x+27
4x-2x-3x=27-12
-x=15
x=-15

B) x/4=1/2+1/3
x/4 = 6/12 + 4/12
x/4 = 10/12
(produit en croix)
x=(10*4)/12
x= 40/12
x= 10/3