\documentclass{article}
\usepackage{tikz}
\usepackage{xepersian}
\usepackage{mathabx,cases}
\settextfont{Yas}
\setdigitfont{Yas}
\begin{document}

\tikzstyle{state}=[thick,scale=1] 
\begin{figure}[htb]
\centering
\begin{tikzpicture}
\draw[->] (0,0) -- (5.2,0) node[right] {$x$};
\draw[->] (0,0) -- (0,4) node[left] {$M(x)$};
\foreach \x  in {1,2,3,4}{
        \pgfmathsetmacro \xtext{ \x * 10+50}
         \draw (0,1pt) -- (0,-1pt) node[below] {$0$};
        \draw (\x cm,1pt) -- (\x cm,-1pt) node[below] {$\xtext$};
    }
    \foreach \y  in {2}{
    \pgfmathsetmacro \ytext{ \y /2}
        \draw (1pt,\y cm) -- (-1pt,\y cm) node[left]  {$\ytext$};}
\draw (1.5,0)--(2.5,2)--(2.5,2)--(3.5,0);
\end{tikzpicture}
\caption{نمودار تابع عضویت عدد فازی مثلثی $M$:"حدوداً $75(kg)$" با پهناهای $0.10$}
\label{fig2.12.3}
\end{figure}
%%%%%%%%%%%%%%
%%%%%%%%%%%%%%
\end{document}