Réponses

2014-01-16T20:01:09+01:00
Bonsoir
-15-9(-5+3b) = -15 +45 -27b = -27b + 30

-5(6-3z)-9+z = -30 +15z -9 +z = 16z - 39

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