Soit x le nombre

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• Temps total = 3 heures
• Vitesse moyenne = 66 / 3 = 22 km/h
• La racine carrée d’un nombre est 7 de plus que trois fois le nombre lui-même. Quel est ce nombre ?
• √x = 3x + 7
• Élevons au carré : x = (3x + 7)² = 9x² + 42x + 49
• = 9x² + 41x + 49

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