答案1
也许你想要的就是这样的东西。改编自评论中链接的答案。(关于编号的那个使用了包tabu
,我不推荐,它与编号问题无关。)
\documentclass{article}
\usepackage{amsmath,amssymb}
\usepackage{array}
\usepackage{etoolbox}
\newcounter{cellnum}
\renewcommand{\thecellnum}{\textcircled{\raisebox{-.9pt}{\arabic{cellnum}}}}
\newcolumntype{N}{>{\stepcounter{cellnum}\makebox[1em][r]{\thecellnum}\hspace{0.5em}}l}
\AtBeginEnvironment{array}{\setcounter{cellnum}{-1}} % set to 0 to start at 1
\begin{document}
\[
\begin{array}{NNNN}
2 & 5 & -2 & -5 \\
a \geqq 2 & a \geqq 3 & a \geqq 4
\end{array}
\]
\[
\begin{array}{NNNN}
2 & 5 & -2 & -5 \\
a \geqq 2 & a \geqq 3 & a \geqq 4
\end{array}
\]
\end{document}