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\input{preamble-standalone.ltx}
\begin{document}
% Ex. No. 16 (Section 5.6 : Placer des points avec deux fonctions)
\begin{tikzpicture}[scale=4]
\tkzInit[xmax=3,ymax=2]
\tkzAxeX
\tkzAxeY
\tkzGrid(0,0)(3,2)
\tkzFct[color = red,domain = 1./3:3]{0.125*(3*x-1)+0.375*(3*x-1)/(x*x)}
\tkzFct[color = green,domain = 1./3:3]{0.125*(3*x-1)}
\tkzSetUpPoint[shape=circle, size = 10, color=black, fill=lightgray]
\tkzDefPointByFct[draw,with = a](1)
\tkzDefPointByFct[draw,with = a](2)
\tkzDefPointByFct[draw,with = a](3)
\tkzDefPointByFct[draw,with = b](3)
\tkzDefPointByFct[draw,with = b](1/3)
\tkzText[draw,color= red,fill=red!20](1,1.5) %
{$f(x)=\frac{1}{8}(3x-1)+\frac{3}{8}%
\left(\frac{3x-1}{x^2}\right)$}
\tkzText[draw,color= green!50!black,fill=green!20]%
(2,0.3){$g(x)=\frac{1}{8}(3x-1)$}
\end{tikzpicture}
\end{document}
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