Voici donc un ECM :
\documentclass[12pt, french]{beamer}
\usepackage[utf8x]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[light, largesmallcaps]{kpfonts}
\usepackage{amsmath}
\usepackage[export]{adjustbox}
\usepackage{mwe}
\usepackage{babel}
\begin{document}
Ceci :\\[3 mm]
\includegraphics[scale=0.9,center]{example-image-a}
\end{document}
