Sagot :
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
b) 12x+4(6-3x)=12x+24-12x=24
c) -15+9(3b-5)=-15+27b-45=27b-60
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
=30-15z-9+z
= 21-14z
12x+4(6-3x)
=12x+24-12x
=24
-15+9(3b-5)
= -15+27b-45
=60+27b