Devoir 02 - S01

📅 December 08, 2025   |   👁️ Views: 153   |   📝 3 exercises   |   ❓ 27 questions



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% Exercise 1 (originally 1)
\printexo{1}{: (5.5 pts)}{
On considère la suite réelle \((u_n)\) définie par :
~$
u_0 = \frac{1}{2} \quad \text{et} \quad (\forall n \in \mathbb{N}) \quad u_{n+1} = \frac{1 + 2u_n}{2 + u_n}$~

\begin{enumerate}[tight, label=\arabic*)]
    \item
    \begin{enumerate}[tight, label=(\alph*)]
        \item Montrer que : \((\forall n \in \mathbb{N}) : 0 < u_n < 1\). \dotfill (1 pt)
        \item Montrer que \((u_n)\) est croissante. \dotfill (1 pt)
    \end{enumerate}

    \item Soit \((v_n)_{n \in \mathbb{N}}\) la suite réelle définie par : \(v_n = \frac{u_n - 1}{u_n + 1}\).
    \begin{enumerate}[tight, label=(\alph*)]
        \item Montrer que \((v_n)\) est une suite géométrique de raison \(q = \frac{1}{3}\). \dotfill (1 pt)
        \item Montrer que : \((\forall n \in \mathbb{N}) : u_n = \frac{1 - \left( \frac{1}{3} \right)^{n+1}}{1 + \left( \frac{1}{3} \right)^{n+1}}\).\\
        En déduire la limite de la suite \((u_n)\). \dotfill (1 pt)
    \end{enumerate}

    \item On pose pour tout \(n \in \mathbb{N} : S_n = v_0 + v_1 + \cdots + v_n\) et \(T_n = \sin(\pi S_n)\).
    \begin{enumerate}[tight, label=(\alph*)]
        \item Montrer que : \((\forall n \in \mathbb{N}) : S_n = -\frac{1}{2} \left( 1 - \frac{1}{3^{n+1}} \right)\). \dotfill (1 pt)
        \item En déduire la limite de la suite \((T_n)\). \dotfill (0,5 pt)
    \end{enumerate}
\end{enumerate}
}

% Exercise 2 (originally 2)
\printexo{2}{: (11.75 pts)}{
Soit \(f\) la fonction numérique définie par : \(f(x) = 4x\sqrt{x} - 3x^2\). \\
Soit \((C_f)\) sa courbe représentative dans un repère orthonormé \((O; \vec{i}, \vec{j})\).
\begin{enumerate}[tight, label=\arabic*)]
    \item Déterminer \(D_f\). \dotfill (0,25 pt)

    \item Étudier la dérivabilité à droite en 0 de la fonction \(f\) puis interpréter le résultat obtenu. \dotfill (1 pt)

    \item Calculer \(\lim\limits_{x \to +\infty} f(x)\) et \(\lim\limits_{x \to +\infty} \frac{f(x)}{x}\) \\ puis déduire la nature de la branche infinie de
      \((C_f)\) au voisinage de \(+\infty\). \dotfill (1,25 points)

    \item Montrer que : \((\forall x \in \mathbb{R}^*_+) : f'(x) = 6\sqrt{x} \left( 1 - \sqrt{x} \right)\). \dotfill (1 pt)

    \item Dresser le tableau de variations de \(f\). \dotfill (1 pt)

    \item
    \begin{enumerate}[tight, label=(\alph*)]
        \item Vérifier que : \((\forall x \in \mathbb{R}_+) : f(x) - x = x \left( \sqrt{x} - 1 \right) \left( 1 - 3\sqrt{x} \right)\). \dotfill (0,5 pt)
        \item En déduire la position relative de \((C_f)\) et la droite d'équation \(y = x\). \dotfill (1 pt)
    \end{enumerate}

    \item Montrer que : \((\forall x \in \mathbb{R}^*_+) : f''(x) = \frac{3\left( 1 - 2\sqrt{x} \right)}{\sqrt{x}}\) puis étudier la concavité de \((C_f)\). \dotfill (1,5 points)

    \item Déterminer les points d'intersection de \((C_f)\) avec l'axe des abscisses. \dotfill (1 pt)

    \item Construire \((C_f)\). \dotfill (1 pt)

    \item Soit \((u_n)\) la suite numérique définie par : \(u_0 = \frac{1}{2}\) et \(u_{n+1} = f(u_n)\) pour tout \(n \in \mathbb{N}\).
    \begin{enumerate}[tight, label=(\alph*)]
        \item Montrer que : \((\forall n \in \mathbb{N}) : \frac{1}{9} \leq u_n \leq 1\). \dotfill (0,75 pt)
        \item Montrer que \((u_n)\) est croissante (on pourra utiliser le résultat de 6). \dotfill (0,5 pt)
        \item En déduire que la suite \((u_n)\) est convergente et calculer sa limite. \dotfill (1 pt)
    \end{enumerate}
\end{enumerate}
}

% Exercise 3 (originally 3)
\printexo{3}{: (2.75 pts)}{
Soit \(h\) la fonction définie sur \(I = [0; +\infty[\) par : \(h(x) = \frac{2x+1}{(x+1)^3}\).\\
\begin{enumerate}[tight, label=\arabic*)]
    \item Vérifier que : \((\forall x \in I) : h(x) = u'(x) u(x)\) où : \(u : x \mapsto \frac{2x+1}{x+1}\). \dotfill (0,75 pt)

    \item En déduire les fonctions primitives de \(h\) sur \(I\). \dotfill (1 pt)

    \item Vérifier que : \((\forall x \in I) : h(x) = \frac{2}{(x+1)^2} - \frac{1}{(x+1)^3}\). \\
    En déduire de nouveau les primitives de \(h\) sur \(I\). \dotfill (1 pt)
\end{enumerate}
}








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Frequently Asked Questions

What chapters or courses does this exam cover?
This exam covers: اشتقاق دالة عددية و دراسة الدوال, نهاية متتالية عددية, الدوال الأصلية. It is designed to test understanding of these topics.

How many questions are in this exam?
The exam contains approximately 27 questions.

Is this exam aligned with the official curriculum?
Yes, it follows the 2-bac-science maths guidelines.

What topics are covered in this course?
The course "Limite d'une Suite Numérique" covers key concepts of maths for 2-bac-science. Designed to help students master the curriculum.

Is this course suitable for beginners?
Yes, the material is structured to be accessible while providing depth for advanced learners.

Are there exercises or practice problems?
This resource includes 3 exercise(s) to reinforce learning.

Does this course include solutions?
Solutions are available separately.


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