Réponses

2012-12-02T17:28:42+01:00

7y + 9(y-2)

Distributivité
x(a-b) = xa-xb

 

6(a+1)+8(3+a)

Distributivité

x(a+b)=xa+xb

 

13+5(3-x)

Distributivité

2012-12-02T17:29:23+01:00

7y +9(y-2) = 7y +9y -18 = 16y -18

 

6(a+1) +8 (3+a) = (6a+6)+(24+8a)

= 6a +6 +24+8a = 14a +30

 

13 +5(3-x) = 13+15-5x = -5x +28