Réponses

2013-12-04T14:25:02+01:00
A) 5(6-3z)-9+z=30-15z-9+z=39-14z
b) 12x+4(6-3x)=12x+24-12x=24
c) -15+9(3b-5)=-15+27b-45=27b-60
2013-12-04T14:28:07+01:00
5(6-3z)-9+z
=30-15z-9+z
= 21-14z

12x+4(6-3x)
=12x+24-12x
=24

-15+9(3b-5)
= -15+27b-45
=60+27b