Control 02 S02
📅 November 16, 2025 | 👁️ Views: 611 | 📝 2 exercises
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This PDF covers maths exam for 1-bac-science-maths students. It includes 2 exercises. Designed to help you master the topic efficiently.
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\def\examtitle{Devoir 02 - S01, {\small Par Aissa HIYAB}}
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% Exercise 1
\printexo{1}{(9pts)}{
\vspace*{-0.5cm}
On considère l'application
\begin{tabular}{ *{2}{>{$}l<{$}} }
f : \mathbb{R} \setminus \{2\} \to \mathbb{R}\\
\quad\;\; x \mapsto \frac{3x + 1}{x - 2}
\end{tabular}
\begin{enumerate}
\item[\textbf{1)}]
\begin{enumerate}
\item[\textbf{a)}] Résoudre dans $\mathbb{R}$ l'équation $f(x) = 3$ \dotfill 0.5pt
\item[\textbf{b)}] $f$ est-elle surjective ? Justifier \dotfill 0.5pt
\end{enumerate}
\item[\textbf{2)}] Montrer que $f$ est injective. \dotfill 1pt
\item[\textbf{3)}] On considère l'application
\begin{tabular}{ *{2}{>{$}l<{$}} }
g : ]2; +\infty[ \rightarrow ]3; +\infty[\\
\quad\;\; x \mapsto g(x) = f(x)
\end{tabular}
\begin{enumerate}
\item[\textbf{a)}] Montrer que $g(]2; +\infty[) = ]3; +\infty[$ \dotfill 1pt
\item[\textbf{b)}] En déduire que $g$ est bijective et déterminer sa bijection réciproque $g^{-1}$. \dotfill 2pt
\end{enumerate}
\item[\textbf{4)}] Montrer que $g([9; +\infty[) = ]3; 4]$ et $g^{-1}([10; +\infty[) = ]2; 3]$ \dotfill 2pt
\item[\textbf{5)}] Soit $h : E \rightarrow F$ une application.\\
Montrer que $(\forall A, B \in \mathcal{P}(E)): A \subset B \Rightarrow h(A) \subset h(B)$ et $h(A \cap B) \subset h(A) \cap h(B)$ \dotfill 1pt
\item[\textbf{6)}] Montrer que la composée de deux applications injectives est injective. \dotfill 1pt
\end{enumerate}
}
% Exercise 2
\printexo{2}{(11pts)}{\\
On considère les fonctions numériques $f$ et $g$ définies par $f(x) = \sqrt{x + 4}$ et $g(x) = x^2 - 4x + 5$.
\begin{enumerate}[itemsep=0pt, topsep=0pt, parsep=0pt, partopsep=0pt]
\item[\textbf{1)}] Déterminer $D_f$, $D_g$ puis dresser les tableaux de variations de $f$ et de $g$. \dotfill 0.5pt
\item[\textbf{2)}] Montrer par deux méthodes que $1$ est la valeur minimale de $g$ sur $D_g$. \dotfill 1pt
\item[\textbf{3)}] Déterminer la nature et les éléments caractéristiques de $(C_g)$. \dotfill 0.5pt
\item[\textbf{4)}] Déterminer les points d'intersection de $(C_f)$ avec les axes du repère. \dotfill 1pt
\item[\textbf{5)}] Tracer les courbes $(C_f)$ et $(C_g)$ dans le même repère orthonormé $(O, \vec{i}, \vec{j})$. \dotfill 2pt
\item[\textbf{6)}]
\begin{enumerate}[itemsep=0pt, topsep=0pt, parsep=0pt, partopsep=0pt]
\item[\textbf{a)}] Déterminer graphiquement $f([-3; 0])$ et $f([0; +\infty[)$. \dotfill 0.5pt
\item[\textbf{b)}] Résoudre graphiquement l'inéquation $g(x) < 2$. \dotfill 0.5pt
\item[\textbf{c)}] Déterminer graphiquement en justifiant le nombre de solution de l'équation $g(x) = f(x)$. \dotfill 0.5pt
\item[\textbf{d)}] Déterminer graphiquement le nombre de solution de l'équation $g(x) = m$ avec $m \in \mathbb{R}$. \dotfill 0.5pt
\end{enumerate}
\item[\textbf{7)}] On considère la fonction numérique $\varphi$ définie par $\varphi(x) = x^2 - 4|x| + 5$.
\begin{enumerate}[itemsep=0pt, topsep=0pt, parsep=0pt, partopsep=0pt]
\item[\textbf{a)}] Vérifier que $\varphi$ est paire et que $(\forall x \in [0; +\infty[)\quad \varphi(x) = g(x)$. \dotfill 1pt
\item[\textbf{b)}] Tracer la courbe $(C_{\varphi})$ dans le repère précédent en justifiant la méthode de construction. \dotfill 1pt
\end{enumerate}
\item[\textbf{8)}] On considère la fonction numérique $h$ définie sur $[-4; +\infty[$ par $h(x) = x + 9 - 4\sqrt{x + 4}$.
\begin{enumerate}[itemsep=0pt, topsep=0pt, parsep=0pt, partopsep=0pt]
\item[\textbf{a)}] Montrer que $(\forall x \in [-4; +\infty[)\quad h(x) = g\circ f(x)$. \dotfill 0.5pt
\item[\textbf{b)}] En déduire les variations de $h$ sur $[-3; 0]$. \dotfill 1pt
\end{enumerate}
\item[\textbf{9)}] On considère la fonction numérique $k$ définie par $k(x) = E(x) + E\left( x + \frac{1}{2}\right) - E(2x)$.\\
Montrer que $k$ est une fonction périodique de période $\frac{1}{2}$. \dotfill 0.5pt
\end{enumerate}
}
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\vskip 3pt \hrule height 3pt \vskip 5pt \RL{\arabicfont ﴿بِسْمِ ٱللَّهِ ٱلرَّحْمَـٰنِ ٱلرَّحِيمِ وَٱلْعَصْرِ (1)• إِنَّ ٱلْإِنسَـٰنَ لَفِى خُسْرٍ (2)• إِلَّا ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّـٰلِحَـٰتِ وَتَوَاصَوْا۟ بِٱلْحَقِّ وَتَوَاصَوْا۟ بِٱلصَّبْرِ (3)• ﴾ (العصر الآيات 1-3) }
\end{center}
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The course "Géneralités sur les Fonctions" covers key concepts of maths for 1-bac-science-maths. Designed to help students master the curriculum.
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