\documentclass{beamer}

\usetheme{Warsaw}

%\usetheme{Singapore}
%%% اینها هنوز کار نمی‌کنند.
%%\usetheme{Bergen}
%%\usetheme{AnnArbor}
%%\usetheme{CambridgeUS}
%%\usetheme{Hannover}
%%%\usetheme{Boadilla}
%%\usetheme{Madrid}
%%%\usetheme{Antibes}
%%%\usetheme{Copenhagen}\setbeamercovered{dynamic}
%%% \usetheme{Marburg} 

\usefonttheme{serif}

\usepackage{ptext}
\usepackage{xepersian}
\settextfont{Yas}

\include{tashih}
\include{commands}

\begin{document}
\begin{frame}
\begin{columns}
\column{.5\textwidth}
   \begin{itemize}
\item<1-> 
\textcolor{red}{$\dfrac{\pi}{N}+i\infty$
  تا
$\dfrac{\pi}{N}-ia^\prime$}
\item<3-> 
\textcolor{blue}{$\dfrac{\pi}{N}-ia^\prime$
تا
$2\pi+\dfrac{\pi}{N}-ia^\prime$}
\item<5-> 
\textcolor{green}{$2\pi+\dfrac{\pi}{N}-ia^\prime$
تا
$2\pi+\dfrac{\pi}{N}+i\infty$}
\end{itemize}
\vspace{3cm}
     \column{.5\textwidth}
\includegraphics<2>[scale=0.6]{71}
\includegraphics<4>[scale=0.6]{72}
\includegraphics<6>[scale=0.6]{73}
\end{columns}
\end{frame}
\end{document}