\documentclass{article}

\usepackage[latin2]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[magyar]{babel}
\usepackage{amsmath}

\begin{document}

magyar: $a+b+\ldots+x$, \\
amerikai: $a+b+\cdots+x$, \\
$ab\cdots x$, $ab\ldots x$,
$a\cdot b\cdot\ldots\cdot x$.

\end{document}