当我在 \begin{array} 中使用顶部对齐时，分隔符大小会增加，需要将其删除。请提供解决方案

Question

梅威瑟：

\documentclass{book}

\usepackage{amsmath,amssymb,amsfonts}

\begin{document}


\begin{tabular}{llll}
\textbf{3} & Write this information in a matrix. Remember to use square brackets. & \textbf{3} &  $\left\{\begin{array}[t]{r@{\hskip0.25em}c@{\hskip0.25em}l}
140 & 58 & 85\cr
200 & 125 & 150\end{array}\right\}$
\end{tabular}

\end{document}

Answer 1

该delarray软件包提供了解决方案：

\documentclass{book}

\usepackage{amsmath,amssymb,amsfonts,delarray}

\begin{document}

\noindent
\begin{tabular}{lp{.6\textwidth}l}
\textbf{3} &
  Write this information in a matrix. Remember to use square brackets. &
  \setlength{\arraycolsep}{0.25em}%
  $\begin{array}[t]\lbrack{@{}rcl@{}}\rbrack
  140 & 58 & 85\\\
  200 & 125 & 150
  \end{array}$
\\[6ex]
\textbf{4} &
  Write this information in a matrix. Remember to use braces. &
  \setlength{\arraycolsep}{0.25em}%
  $\begin{array}[t]\lbrace{@{}rcl@{}}\rbrace
  140 & 58 & 85\\\
  200 & 125 & 150
  \end{array}$
\end{tabular}

\end{document}

Answer 2

两种可能，取决于您想要的垂直对齐方式。请确保使用最新版本的tabstackengine 2018/03/05 (V2.10)。

经过修改的答案与rcl对齐

\documentclass{book}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{tabstackengine}

\begin{document}

\begin{tabular}{llll} \textbf{3} & Write this information in a matrix. 
  Remember to use square brackets. & \textbf{3} & 
  $\left[\tabularCenterstack{rcl}{ 140 & 58 & 85\\ 200 & 125 & 150}\right]$ \end{tabular}

\bigskip
\begin{tabular}{llll} \textbf{3} & Write this information in a matrix. 
  Remember to use square brackets. & \textbf{3} & \belowbaseline[-\ht\strutbox]{%
  $\left[\tabularCenterstack{rcl}{ 140 & 58 & 85\\ 200 & 125 & 150}\right]$} \end{tabular}

\end{document}

列间间隙可以用 重置\setstacktabulargap{<length>}，默认为\tabcolsep。

原始答案左对齐

\documentclass{book}
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{tabstackengine}
\setstacktabbedgap{1ex}
\renewcommand\stackalignment{l}
\begin{document}

\begin{tabular}{llll} \textbf{3} & Write this information in a matrix. 
  Remember to use square brackets. & \textbf{3} & 
  $\bracketMatrixstack{ 140 & 58 & 85\\ 200 & 125 & 150}$ \end{tabular}

\bigskip
\begin{tabular}{llll} \textbf{3} & Write this information in a matrix. 
  Remember to use square brackets. & \textbf{3} & \belowbaseline[-\ht\strutbox]{%
  $\bracketMatrixstack{ 140 & 58 & 85\\ 200 & 125 & 150}$} \end{tabular}

\end{document}

如果您想要矩阵左/右端的额外空间，只需在两端添加一个额外的空白列：$\bracketMatrixstack{&140 & 58 & 85&\\&200 & 125 & 150&}$

同样，如果使用堆栈上的可选参数\renewcommand\stackalignment{l}，则可以消除声明[l]

\bracketMatrixstack[l]{ 140 & 58 & 85\\ 200 & 125 & 150}

Answer 3

您必须创建\vtop第一行支撑的位置，然后是负跳过\baselineskip，然后\hbox在数学模式下打印矩阵的位置。

{\bf 3}\quad\vtop{\hbox{\strut}\vskip-\baselineskip\nointerlineskip\hbox{%
$\left\{\matrix{140 & 58 & 85\cr 200 & 125 & 150}\right\}$}}

\bye