serie exercices: polynomes

📅 February 06, 2024   |   👁️ Views: 1.08K   |   ❓ 6 questions


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maths Exercise for tronc-commun-sciences PDF preview

\documentclass[12pt,a4paper]{article}
\usepackage{tabularx}
\usepackage{booktabs}
\usepackage{ragged2e}
\usepackage[left=1.00cm, right=1.00cm, top=1.00cm, bottom=1.00cm]{geometry}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage{enumitem}
\usepackage{multirow}
\usepackage{xcolor}
\usepackage[ddmmyyyy]{datetime}

\usepackage{hyperref}
\hypersetup{
    colorlinks=true,
    linkcolor=blue
}
\newcommand{\mylink}{\href{https://mosaid.xyz/cc}{www.mosaid.xyz}}

\newcolumntype{C}{>{\Centering\arraybackslash}X}

\begin{document}
\thispagestyle{empty}
\begin{center}
    \begin{tabularx}{\textwidth}{@{}CCC@{}}
        %\toprule
            \multirow{2}{*}{\parbox{\linewidth}{Prof MOSAID \newline \mylink }}
            & Serie - Polynomes & \hfill TCS-F \\
        \bottomrule
    \end{tabularx}
\end{center}
\textbf{\underline{Exercice 1:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.98\textwidth}}
    &1. Soit le polynome \(P(x)=(a+b)x^3+(b-c)x^2+(a-c+1)x\).\\
    &\hspace*{0.4cm}Determiner les nombres \(a, b\) et \(c\) pour que \(P(x)\)soit nul.\\
    &2. Soit le polynome \(P(x)=x^3+4x^2+x-6\).\\
    &\hspace*{0.4cm}Determiner les racines du polynome parmi les nombres: \(1, -1, 2 \) et \(-3\)\\
\end{tabular}
\\
\\
\textbf{\underline{Exercice 2:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.35\textwidth}p{0.63\textwidth}}
    &\multicolumn{2}{l}{Determiner le quotient et le reste de la division euclidienne de:}\\
    &\begin{itemize}[topsep=3pt, partopsep=0pt, parsep=0pt, itemsep=0pt, after=\vspace*{-1.5\baselineskip}, before=\vspace*{-\baselineskip}]
        \item \(2x^3+3x^2-5x+1\quad\) par \(x+2\)
        \item \(5x^4-3x^2+2x-3\quad\) par \(x+1\)
        \item \(4x^5-5x^3+1\)\hspace*{1.45cm} par \(x-1\)
    \end{itemize}
    &\begin{itemize}[topsep=3pt, partopsep=0pt, parsep=0pt, itemsep=0pt, after=\vspace*{-1.5\baselineskip}, before=\vspace*{-\baselineskip}]
        \item \(x^3-x^2-x-2\quad\)\hspace*{0.6cm} par \(x-2\)
        \item \(5x^4-3x^2+2x-3\quad\) par \(x+1\)
        \item \(4x^5-5x^2+1\)\hspace*{1.38cm} par \(2x-1\)
    \end{itemize}\\
\end{tabular}
\\
\textbf{\underline{Exercice 3:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.98\textwidth}}
    &Soit le polynome \(P(x)=x^3+2x^2-5x-6\)\\
    &1. Vérifiez que \(2\) est une racine du polynome \(P(x)\)\\
    &2. En effectuant la division euclidienne de \(P(x)\) par \(x-2\)\\
    &\hspace*{0.5cm} Déterminez un polynome \(Q(x)\) tel que \(P(x)=(x-2)Q(x)\)\\
    &2. Vérifiez que \(-3\) est une racine du polynome \(Q(x)\)\\
    &3. Factoriser \(P(x)\).\hspace*{1cm}
    4. Résoudre \(x\in \mathbb{R}\quad P(x) \ge 0\)\\
\end{tabular}
\\
\\
\textbf{\underline{Exercice 4:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.98\textwidth}}
    &Soit le polynome \(P(x)=-2x^3-x^2+8x+4\)\\
    &1. Vérifiez que \(-2\) est une racine du polynome \(P(x)\)\\
    &2. En effectuant la division euclidienne de \(P(x)\) par \(x-2\)\\
    &\hspace*{0.5cm} Déterminez un polynome \(Q(x)\) tel que \(P(x)=(x+2)Q(x)\)\\
    &2. Vérifiez que \(\frac{-1}{2}\) est une racine du polynome \(Q(x)\)\\
    &3. Factoriser \(Q(x)\) puis \(P(x)\).\hspace*{1cm}
    4. Résoudre \(x\in \mathbb{R}\quad P(x) \le 0\)\\
\end{tabular}
\\
\\
\textbf{\underline{Exercice 5:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.48\textwidth}p{0.58\textwidth}}
    &Soit le polynome \(P(x)=x^3-2x^2-5x+6\)
    &2. Ecrir \(P(x)\) sous forme de produit de binomes\\
    &1. Montrer que \(P(x)\) est divisible par \(x-1\)
    &3. Résoudre \(x\in \mathbb{R}\quad P(x) < 0\)\\
\end{tabular}
\\
\\
\textbf{\underline{Exercice 6:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.98\textwidth}}
    &Soit le polynome \(P(x)=x^3-(a-b)x^2+(a-3b-1)x+2\sqrt{2}\)\\
    &1. Determiner les nombres \(a\) et \(b\) pour que \(P(x)\) soit divisible par
        \(x-2\) et \(x+\sqrt{2}\)\\
    &2. On pose \(a=3\) et \(b=\sqrt{2}\)\\
    &2.1 Déterminez un polynome \(Q(x)\) tel que \(P(x)=(x-2)Q(x)\)\\
    &2.2 Calculer \(Q(-\sqrt{2}\) puis factoriser \(P(x)\)\\
    &2.3 Résoudre \(x\in \mathbb{R}\quad P(x) < 0\)\\
    &3. On suppose \(x\in]0,1[\). Montrer que \(\sqrt{2}\) est une
    approximation de \(P(x)\) à la précision \(1+\sqrt{2}\)\\
\end{tabular}
\\
\\
\textbf{\underline{Exercice 7:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.98\textwidth}}
    &Soit le polynome \(P(x)=x^3-(3\sqrt{3}+1)x^2+m(2+\sqrt{3})x-6\)\\
    &1. Déterminer la valeur de \(m\) tel que \(P(x)\) est divisible par \(x-1\)\\
    &2. On pose \(m=3\)\\
    &2.1 Déterminez un polynome \(Q(x)\) tel que \(P(x)=(x-1)Q(x)\)\\
    &2.2 Vérifiez que \(\sqrt{3}\) est une racine du polynome \(P(x)\)\\
    &2.3 En déduir une factorisation en binomes du polynome \(P(x)\)\\
\end{tabular}
\\
\\
\textbf{\underline{Exercice 8:}}\\
\noindent
\begin{tabular}{@{}p{0.01\textwidth}|p{0.98\textwidth}}
    &Soit le polynome \(P(x)=2x^3+3x^2-3x-2\)\\
    &1. Calculer \(P(-2), P(1)\) et \(P(3)\)\\
    &2. effectuer la division euclidienne de \(P(x)\) par \(x-2\)\\
    &3.1 Montrer que si \(\alpha\) est une racine non nulle de \(P(x)\)
    alors \(\frac{1}{\alpha}\) est une racine\\
    &3.2 Déduir les 3 racines de \(P(x)\)\\
\end{tabular}
\\
\\
\textcolor{white}{.}\hfill \underline{MOSAID le \today}\\
\textcolor{white}{.}\hfill \mylink
\end{document}


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