\documentclass{mathweb}
\graphicspath{{img/}}

\begin{document}
\frontmatter
\dominitoc
%\couverture
\tableofcontents
%\input{src/0-Preface}

\mainmatter

%\addtocontents{toc}{\protect\vspace*{-15mm}}


%\input{src/01-Barycentres} 
%\input{src/02-Pourcentages}
\input{src/03-Moyennes}

\end{document}