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ZekiaChin
@ZekiaChin
February 2021
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Bonsoir,
Travail sur les équations niveau 3ème.
Voici mes réponses :
A) 12-(5x-9)=4x+3
60x+108=4x+3
60x-4x=-108+3
56x/56=-105/56
x= -15/8 soit -1,9. Est-ce bon ?
B) 5+3 (2x+2) = 6-4 (x+1)
16x+16=2+x-1
16x-1x=16+2-1
15x/15 = 17/15 soit 1,1. Est-ce bon?
C) 5-3 (b+2) = (2b+7)-(b-12)
Je n'y arrive pas. Il faut utiliser la distributivité simple et la double non?
Merci d'avance.
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