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Calculer les limites suivantes: A = lim(x->+inf) (5x2+3x+7)/(x3-4x), B = lim(x->+

Mathematics

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Voici les solutions aux exercices demandés.

Exercice 1 : Calculer les limites suivantes

1. A

A=lim⁡x→+∞5x2+3x+7x3−4xA = \lim_{x \to +\infty} \frac{5x^2+3x+7}{x^3-4x}

Pour une fonction rationnelle lorsque x→±∞x \to \pm\infty, la limite est déterminée par le rapport des termes de plus haut degré.

A=lim⁡x→+∞5x2x3=lim⁡x→+∞5xA = \lim_{x \to +\infty} \frac{5x^2}{x^3} = \lim_{x \to +\infty} \frac{5}{x} A=0A = \boxed{0}

2. B

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