\documentclass[utf8]{ctexart}
\usepackage{amsmath,amssymb,amsthm,mathrsfs}
\title{test}
\begin{doc...
\documentclass[utf8]{ctexart}
\usepackage{amsmath,amssymb,amsthm,mathrsfs}
\title{test}
\begin{document}
\begin{equation}
\hat\beta = \hat{\alpha}
\end{equation}
\begin{align}\label{eq:1}
\widehat\alpha &= 1 \\
\beta &= 2
\end{align}
\begin{eqnarray}
\beta &=& 1 \\
\alpha &=& 2
\end{eqnarray}
\begin{eqnarray}
\hat\beta &=& 1 \\
\hat\alpha &=& 2
\end{eqnarray}
\end{document}
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