答案1
\documentclass{article}
\usepackage{array}
\newcommand{\mk}[1]{\makebox[0pt]{#1}}
\begin{document}
\begin{tabular}{|>{$}c<{$}|>{$}c<{$}|>{$}c<{$}|>{$}c<{$}|>{$}c<{$}|}\hline
a + b + c + d + e & a + b + c + d & a + b + c & a + b & a \\\hline
\multicolumn{1}{c}{} &\multicolumn{1}{!{\mk{0.01}}c}{} &\multicolumn{1}{!{\mk{0.05}}c}{}
\end{tabular}
\end{document}
!{something}
保留\tabcolsep
并将内容插入其间。有关详细信息,请参阅array
手册。