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Exercice 1 : Transformer chaque soustraction en somme puis calculer

Exercice 2. CORRIGE ? M. QUET. Exercice 1 : (+7) ? (+4) = (+7) + (-4) = +3. (+6) ? (-3) = (+6) + (+3) = +9. (-8) ? (+5) = (-8) + (-5) = -13.