% Fichier ex4.4.8-2.tex - Ch. Rolland/O Reilly France
\documentclass{article}
\usepackage[latin1]{inputenc}
\begin{document}
\begin{eqnarray}
x & = & \frac{5}{4} + \frac{2}{3} \\
  & = & \frac{15+8}{12} \\
  & = & \frac{23}{12} \\
  & \approx & 1,92
\end{eqnarray}
\end{document}
