Devoir 02 - S01

📅 December 09, 2025   |   👁️ Views: 208   |   📝 2 exercises   |   ❓ 31 questions



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\vspace*{-1cm}
% Exercise 1 (originally 1)
\printexo{1}{: (12 pts)}{
\textbf{Partie I} Soit \( g \) la fonction numérique définie sur \([1; +\infty[\) par :
~$
\boxed{g(x) = x^2 + \sqrt{x - 1}}
$~
\begin{enumerate}[tight]
    \item Étudier la monotonie de la fonction \( g \) sur \([0; +\infty[\), et dresser son tableau de variation . \dotfill (0,75 pt)
    \item Montrer que l’équation \( g(x) = 0 \) admet une solution unique \( \alpha \) sur \([0; +\infty[\), et que \(\frac{1}{2} < \alpha < 1\). \dotfill (0,75 pt)
    \item Montrer que \( (\forall x \in [0; \alpha[) \, ; \, g(x) < 0 \) et \( (\forall x \in ]\alpha; +\infty[) \, ; \, g(x) > 0 \). \dotfill (0,5 pt)
\end{enumerate}
\textbf{Partie II} On considère la fonction \( f \) définie sur \(]0; +\infty[\) par :
~$
\boxed{f(x) = \frac{x^2 + (\sqrt{x - 1})^2}{x}}
$~
\begin{enumerate}[tight]
    \item Calculer \( \lim_{x \to 0^+} f(x) \), puis interpréter géométriquement le résultat obtenu. \dotfill (0,75 pt)
    \item Vérifier que \( (\forall x \in ]0; +\infty[) \, ; \, f(x) = x - \frac{2}{\sqrt{x}} + \frac{1}{x} + 1 \). \dotfill (0,5 pt)
    \item {\fontsize{11}{13}\selectfont Montrer que \( C_f \) admet, au voisinage de \( +\infty \), une asymptote (\( D \))
       dont on déterminera une équation} . \dotfill (0,75 pt)
    \item Montrer que \( (\forall x \in ]0; +\infty[) \, ; \, f'(x) = \frac{g(x)}{x^2} \). \dotfill (0,75 pt)
    \item En déduire que \( f \) est strictement décroissante sur \(]0; \alpha]\) et strictement croissante sur \([\alpha, +\infty[\). \dotfill (0,5 pt)
    \item Montrer que \( f(\alpha) = \alpha + \alpha^3 \), puis dresser le tableau de variations de \( f \) sur \(]0; +\infty[\). \dotfill (0,75 pt)
    \item Montrer que la droite (\( T \)) d’équation \( y = x \) est tangente à la courbe \( C_f \) au point \( A(1; 1) \). \dotfill (0,5 pt)
    \item Montrer que \( (\forall x \in ]0; +\infty[) \, ; \, f(x) \geq x \), puis interpréter ce résultat graphiquement. \dotfill (0,5 pt)
    \item Montrer que \( (\forall x \in ]0; +\infty[) \, ; \, f''(x) = \frac{4 - 3\sqrt{x}}{2x^3} \). \dotfill (0,75 pt)
    \item Étudier la concavité de \( C_f \) et déduire l’abscisse du point d’inflexion de la courbe \( C_f \). \dotfill (0,75 pt)
    \item Construire (\( D \)), (\( T \)) et \( C_f \), dans le même repère (\( O, i, j \)). \dotfill (1,5 pt)
    \item (on prendra \( \alpha \approx 0.5 \), \( f(\alpha) \approx 0.7 \), \( \frac{16}{9} \approx 1.7 \) et \( f\left(\frac{16}{9}\right) \approx 1.8 \)) \dotfill (0,75 pt)
\end{enumerate}
\textbf{Partie III} Soit \( (u_n)_{n \in \mathbb{N}} \) la suite numérique définie par \( u_0 = \alpha \) et \( u_{n+1} = f(u_n) \) pour tout \( n \) de \( \mathbb{N} \).
\begin{enumerate}[tight]
    \item Montrer par récurrence que \( \alpha \leq u_n < 1 \) pour tout \( n \) de \( \mathbb{N} \). \dotfill (0,5 pt)
    \item Montrer que la suite \( (u_n)_{n \in \mathbb{N}} \) est croissante, et en déduire qu’elle est convergente. \dotfill (0,75 pt)
    \item Calculer la limite de la suite \( (u_n)_{n \in \mathbb{N}} \). \dotfill (0,75 pt)
\end{enumerate}
}

% Exercise 2 (originally 2)
\printexo{2}{: (8 pts)}{
On considère la suite \((u_n)_{n \in \mathbb{N}}\) définie par :
~$
u_0 = 3 \quad \text{et} \quad u_{n+1} = \frac{5u_n - 8}{u_n - 1} \quad \text{pour tout } n \in \mathbb{N}.
$~

\begin{enumerate}
\item
Montrer par récurrence que \(2 < u_n < 4\) pour tout \(n\) de \(\mathbb{N}\).

\item
\begin{enumerate}[tight, label=\alph*)]
    \item Vérifier que \(u_{n+1} - u_n = \frac{(u_n - 2)(4 - u_n)}{u_n - 1}\) pour tout \(n\) de \(\mathbb{N}\).
    \item En déduire que la suite \((u_n)_{n \in \mathbb{N}}\) est croissante, et que \(3 \leq u_n < 4\) pour tout \(n\) de \(\mathbb{N}\).
    \item Montrer que la suite \((u_n)_{n \in \mathbb{N}}\) est convergente.
\end{enumerate}

\item
\begin{enumerate}[tight, label=\alph*)]
    \item Montrer que \(\frac{1}{3}(4 - u_n) < 4 - u_{n+1} \leq \frac{1}{2} \times (4 - u_n)\) pour tout \(n\) de \(\mathbb{N}\).
    \item En déduire que \(\left( \frac{1}{3} \right)^n \leq 4 - u_n \leq \left( \frac{1}{2} \right)^n\) pour tout \(n\) de \(\mathbb{N}\).
    \item Déterminer \(\lim_{n \to \infty} u_n\).
\end{enumerate}

\item
Soit \((v_n)_{n \in \mathbb{N}}\) la suite numérique définie par \(v_n = \frac{u_n - 2}{4 - u_n}\) pour tout \(n\) de \(\mathbb{N}\).
\begin{enumerate}[tight, label=\alph*)]
    \item Montrer que \((v_n)_{n \in \mathbb{N}}\) est une suite géométrique de raison 3.
    \item En déduire que \(u_n = \frac{4 \times 3^n + 2}{3^n + 1}\) pour tout \(n\) de \(\mathbb{N}\).
    \item Déterminer de nouveau \(\lim_{n \to \infty} u_n\).
\end{enumerate}
\end{enumerate}
}








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This exam covers: اشتقاق دالة عددية و دراسة الدوال, نهاية متتالية عددية. It is designed to test understanding of these topics.

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The exam contains approximately 31 questions.

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Yes, it follows the 2-bac-science maths guidelines.

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The course "Limite d'une Suite Numérique" covers key concepts of maths for 2-bac-science. Designed to help students master the curriculum.

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