\documentclass[a4paper,10pt]{article}
\usepackage{myXsim}
\usepackage{fancybox}

\author{Benjamin Bertrand}
\title{Fraction, calcul littéral et developpment - Cours}
\date{Octobre 2021}


\DeclareExerciseCollection[step=4]{banque}
\xsimsetup{collect}

\pagestyle{empty}

\begin{document}

\input{exercises.tex}
\printcollection{banque}
\vfill
\printsolution{exercise}{4}
\end{document}