Réponses

2014-04-14T10:58:22+02:00
A = 3(x+2)-x+1
A=3x+6-x+1
A=2x+7
B = -4 (-3x-1)-(4x+7)
B=12x+4-4x-7
B=8x-3
C =-7(-x+3)+3(x+2)+2(x-1)
C=7x-21+3x+6+2x-2
C=12x-17
2014-04-14T11:00:37+02:00
A = 3(x+2)-x+1
A= 3*x+3*2-x+1
A= 3x+6-x+1
A= 2x+7

B = -4 (-3x-1)-(4x+7)
B=-4(-3x-1)-4x-7
B=-4*(-3x)-4*(-1)-7
B= 12x +4-7
B= 12x-3

C=-7(-x+3)+3(x+2)+2(x-1)
C= -7*(-x)-7*3+3*x+3*2+2*x+2*(-1)
C= 7x-21+3x+6+2x-2
C=12x-17


Voilaaaa, bon verifie au cas ou mais je pense que c'est ca :)