J'ai besoin d'aide :

On considère ce programme de calcul :
• On choisit un nombre relatif
• On lui ajoute -4
• On multiplie par 3 le résultat
• Enfin, on ajoute 12
1) Effectuer ce programme de calcul pour :
a) 2 b) -5 c)0 d) -1
2) A l'aide du calcul littéral, justifier que ce programme calcule le triple du nombre initial.
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