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Solution de la question 1 de l'exercice MA12_Seq8_Ch2_Ex3
Dans les cellules A2 et A3, on rentre respectivement 0 et 1 et on recopie ces deux cellules vers le bas.
Dans la cellule B2, on rentre = 3A2 - 3^B2 et on recopie cette cellule vers le bas.