Bonjour svp aider moi :) On donne les expressions A=3x(x+4) B=5x-2x+12 C=7x+(-4)x(x-3)
a)calculer a,b,c pour x = 3
b)Calculer a,b,c pour x= (-6)
c) en utilisant la distributivité, démontrer que A=B=C
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