Devoir 02 S01

📅 November 22, 2025   |   👁️ Views: 443   |   📝 3 exercises   |   ❓ 28 questions



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This PDF covers maths exam for 2-bac-science students. It includes 3 exercises and 28 questions. Designed to help you master the topic efficiently.

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\def\professor{R. MOSAID}
\def\classname{2BAC.PC/SVT}
\def\examtitle{\small{\textbf{Devoir 02 - S01, par Prof TABRART Abdelaziz},~\texttt{tabrart@gmail.com} }}
\def\schoolname{\textbf{Lycée :} Taghzirt}
\def\academicyear{2025/2026}
\def\subject{Mathématiques}
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\vspace*{-1cm}
% Exercise 1
\printexo{1}{}{

\vspace*{-1cm}
Soit ~$ (U_n)_{n \in \mathbb{N}} $~ une suite numérique définie par :
~$
\begin{cases}
U_0 = 3\\
U_{n+1} = \frac{3U_n + 2}{U_n + 2}
\end{cases}
$~
\begin{enumerate}
    \item Montrer par récurrence que ~$ (\forall n \in \mathbb{N}) : U_n > 2 $~.

    \item
    \begin{enumerate}
        \item Montrer que ~$ (\forall n \in \mathbb{N}) : U_{n+1} - U_n = \frac{(1 + U_n)(2 - U_n)}{U_n + 2} $~
        \item Étudier la monotonie de ~$ (U_n)_n $~ puis déduire que La suite ~$ (U_n)_n $~ est convergente
    \end{enumerate}

    \item
    \begin{enumerate}
        \item Montrer que ~$ (\forall n \in \mathbb{N}) : 0 < U_{n+1} - 2 < \frac{1}{4}(U_n - 2) $~
        \item Montrer par récurrence que ~$ (\forall n \in \mathbb{N}) : 0 < U_n - 2 \leq \left( \frac{1}{4} \right)^n $~ puis calculer ~$ \lim U_n $~
    \end{enumerate}

    \item On considère la suite ~$ (V_n)_{n \in \mathbb{N}} $~ définie par ~$ V_n = \frac{2 - U_n}{U_n + 1} $~
    \begin{enumerate}
        \item Montrer que la suite ~$ (V_n) $~ est géométrique de raison ~$ \frac{1}{4} $~.
        \item Déterminer ~$ (V_n) $~ en fonction de ~$ n $~.
        \item Déduire ~$ (U_n) $~ en fonction de ~$ n $~, puis calculer ~$ \lim U_n $~ une autre fois
    \end{enumerate}
\end{enumerate}
}

% Exercise 2
\printexo{2}{}{
Soit ~$ f $~ la fonction définie par ~$ f(x) = (x^2 + 1)\sqrt{x + 1} + x $~\\
et ~$ (\mathcal C_f) $~ sa courbe représentative dans un repère orthonormé
\begin{enumerate}
    \item Vérifier que ~$ D_f = [-1; +\infty[ $~.

    \item
    \begin{enumerate}
        \item Calculer ~$ \lim_{x \to +\infty} f(x) $~.
        \item Déterminer la branche infinie de ~$ (\mathcal C_f) $~ au voisinage de ~$ +\infty $~.
    \end{enumerate}

    \item Montrer que ~$ \lim_{\substack{x\to -1\\ x>-1}} \frac{f(x) - f(-1)}{x + 1} = +\infty $~ puis interpréter géométriquement le résultat.

    \item
    \begin{enumerate}
        \item Montrer que ~$ f $~ est dérivable sur ~$ ]-1; +\infty[ $~
        \item Montrer que ~$ (\forall x \in ]-1; +\infty[)\quad : f'(x) = \frac{(2x + 1)^2 + x^2}{2\sqrt{x + 1}} + 1 $~
        \item Donner le tableau de variation de ~$ f $~.
    \end{enumerate}

  \item Montrer que l'équation ~$ f(x) = 0 $~ admet une unique solution ~$ \alpha \in ]-1; 0[ $~

    \item Construire la courbe ~$ (\mathcal C_f) $~.

    \item Montrer que ~$ f $~ admet une fonction réciproque ~$ f^{-1} $~ définie sur ~$ J $~ à déterminer.

    \item Montrer que ~$ f^{-1} $~ est dérivable en 1 puis calculer ~$ (f^{-1})'(1) $~.

    \item Construire ~$ (\mathcal C_{f^{-1}}) $~ dans le même repère
\end{enumerate}
}

% Exercise 3
\printexo{3}{}{
Les questions sont indépendantes
\begin{enumerate}
    \item Déterminer les fonctions primitives des fonctions suivantes sur ~$ I = \mathbb{R} $~\\
      (a)~ ~$ f(x) = x^3 - x^2 + 3x - 2 $~ \hspace*{1.5cm}
        (b)~ ~$ f(x) = \frac{x + 2}{\left( 2x^2 + 8x + 9 \right)^2} $~
    \item Calculer ~$ \lim_{n \to +\infty} U_n $~ dans les cas suivants\\
      (a)~ ~$ U_n = \frac{2n^3 - 1}{3n^2 + 2n - 1} $~ \hspace*{1.5cm}
         (b)~ ~$ U_n = \frac{\sqrt{2}^n - \sqrt{3}^n}{\sqrt{2}^n + \sqrt{3}^n} $~
\end{enumerate}
}

\end{document}



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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 28 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 "Dérivation et Etude des Fonctions" 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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