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Source de ex7.tex

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\input arrows.tex
$$
\vcenter{
   \def \hfq{\hfil \ }
   \offinterlineskip
   \halign{
   % preamble
      &\hfq #\hfq
   \cr
      $t$& \vrule depth 5pt & 
      $-1$&& $0$&& $1$&& $2$&
   \cr
   \noalign{\hrule}
      $x' (t)$& \vrule height 10pt depth 3pt &
      $-2$& $-$& $0$& $+$& $2$& $+$& $4$&
   \cr
   \noalign{\hrule}
      \bbuucenter{$x (t)$}& \vrule& 
      \bbup{$2$}&
      \brightdownarrow & \down{$1\strut $}& 
      \brightuparrow & \bup{$2$}& 
      \bup{\brightuparrow} & \bup{\bup{$5$}}
   \cr
   \noalign{\hrule}
      $y' (t)$& \vrule height 10pt depth 3pt &
      $-4$& $-$& $-2$& $-$& $0$& $+$& $2$&
   \cr
   \noalign{\hrule}
      \bbuucenter{$x (t)$}& \vrule& 
      \bbuup{$5$}&
      \bbup{\brightdownarrow} & \bup{$2$}& 
      \brightdownarrow & \down{$1$}& 
      \bbrightuparrow & \bbup{$2$}
   \cr
}}
$$
\bye