Schneider Pierce
04/20/2024 · Senior High School
Soit \( h \) la fonction définie sur \( |e,+\infty| \) par \( h(x)=\frac{x}{\ln (x)} \) Calculer \( h^{\prime}(x) \) pour tout \( x \in|e,+\infty| \). puis montrer que \( (\forall x \in|e,+\infty|), \quad 0 \leq h^{\prime}(x) \leq \frac{1}{4} \)
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Pour la fonction \( h(x) = \frac{x}{\ln(x)} \) définie sur \( [e, +\infty[ \), la dérivée est \( h'(x) = \frac{\ln(x) - 1}{(\ln(x))^2} \). Pour tout \( x \geq e \), \( h'(x) \) est toujours positif et ne dépasse pas \( \frac{1}{4} \).
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