Bonsoir. Je suis en 4ème. Réduire chaque expression : G = +3-(a-b)+5+(a+b)+a. H = -3-(-a+b)+5a-9+(-3a-5b). I = -(3xaucarré+7)+6x-1-(15xaucarré+7x-3). J = xaucarré-(3xaucarré-15x+4)+(15xaucarré-12xaucarré-x). Merci d'avance et bonne soirée.
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