Réponses

  • Utilisateur Brainly
2014-05-28T20:22:53+02:00
Meilleure réponse !
2014-05-28T20:24:03+02:00
b/
13+5(3-x)
=13+5*3+5*(-x)
=13+15-5x
=-5x+28

c/
7y+9(y-2)
=7y+9*y+9*(-2)
=7y+9y-18
=16y-18

d/
6(a+1)+8(3+a)
=6*a+6*1+8*3+8*a
=6a+6+24+8a
=14a+30

a/
2(x+3)+5
=2*x+2*3+5
=2x+6+5
=2x+11

voilà :)