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  1. documentclass{article}
  2. usepackage{tikz}
  3. begin{document}
  4. usetikzlibrary{matrix}
  5. % The table environment:
  6. newenvironment{matrixtable}[3]{%
  7.   begin{tikzpicture}[matrix of nodes/.style={
  8.     execute at begin cell=nodebgroupstrut,
  9.     execute at end cell=egroup;}]
  10.   matrix (m) [matrix of nodes,top color=white!20,
  11.     bottom color=white!80,draw=white,
  12.     nodes={draw,top color=white!10,bottom color=blue!15,
  13.     draw,inner sep=2pt,minimum height=3.1ex},
  14.     column sep=1ex,row sep=0.6ex,inner sep=2ex,
  15.     rounded corners,column 1/.style={minimum width=#1},
  16.     column 2/.style={minimum width=#2},
  17.     column 3/.style={minimum width=#3}]}
  18.    %
  19. {;end{tikzpicture}}
  20. %
  21.  
  22.  
  23. begin{center}
  24. begin{frame}
  25.  
  26. begin{matrixtable}{7cm}{3cm}{7cm}{
  27.   head{Intervalle}   & head{Inégalité} & head{Représentation graphique}  \
  28.   $[a~;~b]text{ fermé }$ & $ ale xle b$  & graph 1 \
  29.   $[a~;~b[text{ fermé à  gauche, ouvert à  droite }$ & $ale x<b $   & graph2 \
  30.   $]a~;~b]text{ ouvert à gauche, fermé à droite }$ & $a<xle b$      & graph3\
  31.    $]a~;+infty [$ & $x>a$ &  graph4 \
  32.   $[a~;+infty [$ & $xge a$ &  graph5  \
  33.  $]-infty;b~ [$ & $x< b$ &  graph6    \
  34.   $]-infty;b~ ]$ & $xle b$ &  graph7     \
  35.   }
  36. end{matrixtable}
  37.  
  38. end{frame}
  39. end{center}
  40. end{document}
  41.      
  42. usepackage{tikz}
  43. usetikzlibrary{arrows.meta,decorations.pathreplacing}
  44. begin{document}
  45. begin{tikzpicture}
  46.  draw[stealth-stealth] (-6,0) node[below]{$-infty$} -- (6,0) node[below]{$infty$};
  47.  draw[very thick,blue,{Bracket[reversed,width=1.2em]}-{Bracket[width=1.2em]}] (-3.05,0) -- (2,0) node[pos=-1/40,above]{$a$} node[pos=29/30,above]{$b$};
  48.  end{tikzpicture}
  49. end{document}
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