Réponses

2013-12-03T17:13:11+01:00
A = 3(2x+7)=6x+21
B = 3(-2z+7)=-6z+21
C = 3(2c-7)=6c-21
D = (-3)(2n+7)=-6n-21
E = (-3)(-2y-7)=6y+21
F = (-3)(2p-7)=-6p+21
2013-12-03T17:29:58+01:00
A= 3*2x+3*7*
A=6x+21

B=3*(-2z)+3*7
B=-6z+21

C=3*2c-3*7
C=6c+(-21)

D=-3*2n+(-3)*7
D=-6n-21

E= -3*(-2y)+(-3)*7
E= 6y-21

F= -3*2p-(-3)*7
F= -6p+21

ps se signe * ranplace le multiplie
    et x fait la lettre x