J’aurais besoins d’aide pour le c) de l’exercice 3 . J’ai trouvé (2x + 1 )^2 = 2x^2 + 2*2x*1 + 1^2 = 4x^2 + 4x + 1 = 2(2x^2 + 2x) + 1 et après je sais pas trop
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