Devoir 01 S01
📅 November 08, 2025 | 👁️ Views: 692 | 📝 2 exercises | ❓ 27 questions
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This PDF covers maths exam for 2-bac-science students. It includes 2 exercises and 27 questions. Designed to help you master the topic efficiently.
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\def\examtitle{Devoir 01 - S01}
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% Exercise 1
\printexo{1}{(17 points)}{
\noindent
Soit \( f \) une fonction numérique définie par :
~$
\begin{cases}
f(x) = x - 2\sqrt{x} + 2, & x > 0 \\
f(0) = 2 \\
f(x) = x^3 + 2x + 2, & x \leq 0
\end{cases}
$~
\begin{enumerate}
\item Calculer
~$
\lim_{x \to +\infty} f(x) \quad \text{et} \quad \lim_{x \to -\infty} f(x)
$~
\item Étudier la continuité de \( f \) en 0.
\item
\begin{enumerate}
\item Étudier la dérivabilité de \( f \) en 0 à droite et interpréter géométriquement le résultat obtenu.
\item Étudier la dérivabilité de \( f \) en 0 à gauche et interpréter géométriquement le résultat obtenu.
\end{enumerate}
\item
\begin{enumerate}
\item Étudier la dérivabilité de \( f \) sur \( ]0, +\infty[ \) puis vérifier que :
~$
(\forall x \in ]0, +\infty[);\quad f'(x) = \frac{x-1}{\sqrt{x}(\sqrt{x}+1)}
$~
\item Étudier la dérivabilité de \( f \) sur \( ]-\infty, 0] \) puis vérifier que :
~$
(\forall x \in ]-\infty, 0] );\quad f'(x) = 3x^2 + 2
$~
\item Montrer que \( f \) est strictement croissante sur \( [1, +\infty[ \) et sur \( ]-\infty, 0] \) et elle est strictement décroissante sur \( [0, 1] \).
\item Donner le tableau de variations de \( f \).
\end{enumerate}
\item Donner l’équation de la tangente (\( T \)) à la courbe de \( f \) au point d’abscisse \(-1\).
\item
\begin{enumerate}
\item Montrer que l’équation \( f(x) = 0 \) admet une solution unique \( \alpha \) dans \( ]-1, 0[ \).
\item Calculer \( f\left(-\frac{1}{2}\right) \) en déduire un autre encadrement de la solution \( \alpha \).
\end{enumerate}
\item
\begin{enumerate}
\item Étudier le signe de \( f(x) \) pour tout \( x \) de \( \mathbb{R} \).
\item En déduire que \( \forall x \in [0, +\infty[;\quad 2\sqrt{x} \leq x + 2 \).
\end{enumerate}
\item Soit \( g \) une fonction numérique définie sur \( ]-\infty, 0] \) par :
~$
g(x) = f(x)
$~
\begin{enumerate}
\item Montrer que \( g \) admet une fonction réciproque \( g^{-1} \) définie sur l’intervalle \( I \) à déterminer.
\item Montrer que \( g^{-1} \) est dérivable en \(-1\).
\item Déterminer \( (g^{-1})'(-1) \).
\item Donner le tableau de variations de \( g^{-1} \).
\end{enumerate}
\item On considère la fonction numérique \( h \) définie sur \( \mathbb{R} \) par :
~$
\begin{cases}
h(x) = \frac{x^3+2x+2}{x-\alpha}, & x \neq \alpha \\
h(\alpha) = 3 \alpha^2 + 2
\end{cases}
$~\\
Montrer que \( h \) est continue en \( \alpha \) (où \( \alpha \) est le réel donné dans la question 6).
\end{enumerate}
}
% Exercise 2
\printexo{2}{(3 points)}{
\noindent
Calculer \( f'(x) \) pour tout \( x \in I \). On donnera \( f'(x) \) sous la forme réduite dans les cas suivants :
\begin{enumerate}
\item \( f(x) = (\sin(x) + 3)^5, \quad I = \mathbb{R} \)
\item \( f(x) = x - 7 + \frac{2}{2x+1}, \quad I = \left]\frac{-1}{2}, +\infty\right[ \)
\item \( f(x) = x\sqrt{2x + 3}, \quad I = \left[\frac{-3}{2}, +\infty\right[ \)
\end{enumerate}
}
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Frequently Asked Questions
What chapters or courses does this exam cover?
This exam covers: اتصال دالة عددية, اشتقاق دالة عددية و دراسة الدوال. 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 "Continuité d'une Fonction 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 2 exercise(s) to reinforce learning.
Does this course include solutions?
Solutions are available separately.