添加

Question 1

您可以自动tabularx计算最后的宽度。

\documentclass[]{book}
\usepackage{amsmath}
\usepackage{mathtools,tabularx}
\usepackage[showframe]{geometry}

\begin{document}

\noindent%
\begin{tabularx}{\linewidth}{@{} *2{>{\hsize=.5\hsize}X} X@{}}
\begin{align}
  f_1 = a + b \\
  f_2 = a - b 
\end{align}
&
\begin{equation*}
\begin{aligned}
 a ={} &\text{Some one line text}\\
 b ={} &\text{Some two line text}\\
       &\text{The second line}
\end{aligned}
\end{equation*}
&
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.
\end{tabularx}

\end{document}

Answer

您可以自动tabularx计算最后的宽度。

\documentclass[]{book}
\usepackage{amsmath}
\usepackage{mathtools,tabularx}
\usepackage[showframe]{geometry}

\begin{document}

\noindent%
\begin{tabularx}{\linewidth}{@{} *2{>{\hsize=.5\hsize}X} X@{}}
\begin{align}
  f_1 = a + b \\
  f_2 = a - b 
\end{align}
&
\begin{equation*}
\begin{aligned}
 a ={} &\text{Some one line text}\\
 b ={} &\text{Some two line text}\\
       &\text{The second line}
\end{aligned}
\end{equation*}
&
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.
\end{tabularx}

\end{document}

Question 2

两种变体tabularx，将列X类型重新定义为m{some length}：

\documentclass{book}
\usepackage[showframe]{geometry}
\usepackage{mathtools}
\usepackage{tabularx}
\renewcommand{\tabularxcolumn}[1]{>{\arraybackslash}m{#1}}

\begin{document}

   \noindent \begin{tabularx}{\linewidth}{@{}ccX@{}}
          $ \begin{aligned}
            f_1 &= a + b \\
            f_2 &= a - b
            \end{aligned} $
    &
        {$\begin{array}{c @{\medspace}c @{\medspace}l}
            a &= &\text{Some one line text}\\
            b &= &\text{Some two line text}\\
            & &\text{The second line}
        \end{array}$}
     &
  This is a detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.\\
    \end{tabularx}
\vspace{1cm}

   \noindent \begin{tabularx}{\linewidth}{@{} >{\centering$}m{0.25\textwidth}<{$}cX@{}}
           \begin{aligned}
            f_1 &= a + b \\
            f_2 &= a - b
            \end{aligned}
    &
        {$\begin{array}{c @{\medspace}c @{\medspace}l}
            a &= &\text{Some one line text}\\
            b &= &\text{Some two line text}\\
            & &\text{The second line}
        \end{array}$}
     &
  This is a detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.\\
    \end{tabularx}

\end{document}

Answer

两种变体tabularx，将列X类型重新定义为m{some length}：

\documentclass{book}
\usepackage[showframe]{geometry}
\usepackage{mathtools}
\usepackage{tabularx}
\renewcommand{\tabularxcolumn}[1]{>{\arraybackslash}m{#1}}

\begin{document}

   \noindent \begin{tabularx}{\linewidth}{@{}ccX@{}}
          $ \begin{aligned}
            f_1 &= a + b \\
            f_2 &= a - b
            \end{aligned} $
    &
        {$\begin{array}{c @{\medspace}c @{\medspace}l}
            a &= &\text{Some one line text}\\
            b &= &\text{Some two line text}\\
            & &\text{The second line}
        \end{array}$}
     &
  This is a detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.\\
    \end{tabularx}
\vspace{1cm}

   \noindent \begin{tabularx}{\linewidth}{@{} >{\centering$}m{0.25\textwidth}<{$}cX@{}}
           \begin{aligned}
            f_1 &= a + b \\
            f_2 &= a - b
            \end{aligned}
    &
        {$\begin{array}{c @{\medspace}c @{\medspace}l}
            a &= &\text{Some one line text}\\
            b &= &\text{Some two line text}\\
            & &\text{The second line}
        \end{array}$}
     &
  This is a detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.\\
    \end{tabularx}

\end{document}

Question 3

正如所有其他答案所使用的那样tabularx，这是另一种方法：

minipages 或 parboxes 的问题仅在于，如果您有三个框（即 A、B、C），其中间隔两个\quad（1em）空格，则 C 的宽度必须是文本宽度（例如\linewidth）减去 A+B+2em 的宽度，您可以使用来做到这一点\dimexpr。

另一种方法是使用grid-system包，您只需使用任意整数为三列分配宽度，考虑到三个整数的总和就是文本宽度（减去列分隔），无论总和是 3、17 还是 30。

MWE 展示了两种方法：

\documentclass{book}
\usepackage{amsmath}
\usepackage{grid-system}
\usepackage{geometry}
\newlength\boxa
\newlength\boxb
\newlength\boxc
\parindent0pt
\parskip1em

\begin{document}

\hrulefill With \verb|\dimexpr|  \hrulefill

\setlength\boxa{.2\linewidth}
\setlength\boxb{.3\linewidth}
\setlength\boxc{\dimexpr\linewidth-\boxa-\boxb-2em}

\parbox[t]{\boxa}{\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}}\quad%
\parbox[t]{\boxb}{\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]}\quad%
\parbox[t]{\boxc}{This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.}


\setlength\boxa{.3\linewidth}
\setlength\boxb{.4\linewidth}
\setlength\boxc{\dimexpr\linewidth-\boxa-\boxb-2em}

\parbox[t]{\boxa}{\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}}\quad%
\parbox[t]{\boxb}{\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]}\quad%
\parbox[t]{\boxc}{This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.}

\hrulefill With \verb|grid-system|  \hrulefill

\begin{Row}[cellsep=1em]%
\begin{Cell}{4}
\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}
\end{Cell}
\begin{Cell}{4}
\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]
\end{Cell}
\begin{Cell}{7} 
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like. 
\end{Cell}
\end{Row}

\begin{Row}[cellsep=1em]%
\begin{Cell}{1}
\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}
\end{Cell}
\begin{Cell}{1}
\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]
\end{Cell}
\begin{Cell}{1} 
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like. 
\end{Cell}
\end{Row}

\end{document}

Answer

正如所有其他答案所使用的那样tabularx，这是另一种方法：

minipages 或 parboxes 的问题仅在于，如果您有三个框（即 A、B、C），其中间隔两个\quad（1em）空格，则 C 的宽度必须是文本宽度（例如\linewidth）减去 A+B+2em 的宽度，您可以使用来做到这一点\dimexpr。

另一种方法是使用grid-system包，您只需使用任意整数为三列分配宽度，考虑到三个整数的总和就是文本宽度（减去列分隔），无论总和是 3、17 还是 30。

MWE 展示了两种方法：

\documentclass{book}
\usepackage{amsmath}
\usepackage{grid-system}
\usepackage{geometry}
\newlength\boxa
\newlength\boxb
\newlength\boxc
\parindent0pt
\parskip1em

\begin{document}

\hrulefill With \verb|\dimexpr|  \hrulefill

\setlength\boxa{.2\linewidth}
\setlength\boxb{.3\linewidth}
\setlength\boxc{\dimexpr\linewidth-\boxa-\boxb-2em}

\parbox[t]{\boxa}{\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}}\quad%
\parbox[t]{\boxb}{\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]}\quad%
\parbox[t]{\boxc}{This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.}


\setlength\boxa{.3\linewidth}
\setlength\boxb{.4\linewidth}
\setlength\boxc{\dimexpr\linewidth-\boxa-\boxb-2em}

\parbox[t]{\boxa}{\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}}\quad%
\parbox[t]{\boxb}{\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]}\quad%
\parbox[t]{\boxc}{This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.}

\hrulefill With \verb|grid-system|  \hrulefill

\begin{Row}[cellsep=1em]%
\begin{Cell}{4}
\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}
\end{Cell}
\begin{Cell}{4}
\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]
\end{Cell}
\begin{Cell}{7} 
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like. 
\end{Cell}
\end{Row}

\begin{Row}[cellsep=1em]%
\begin{Cell}{1}
\begin{align}
f_1 &= a + b &\\
f_2 &= a - b &
\end{align}
\end{Cell}
\begin{Cell}{1}
\[\begin{array}{c @{\medspace}c @{\medspace}l}
a &= &\text{Some one line text}\\
b &= &\text{Some two line text}\\
& &\text{The second line}
\end{array}\]
\end{Cell}
\begin{Cell}{1} 
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like. 
\end{Cell}
\end{Row}

\end{document}

Question 4

为什么你说其他答案中的代码不起作用？

\documentclass[a4paper]{book}
\usepackage{mathtools} % automatically loads "amsmath" too



\begin{document}

    \noindent
    You can use multiple \texttt{minipage} environments for side-by-side
    descriptions (some more text to show where the right margin is):
    
    \begin{center}
        \begin{minipage}{.25\linewidth}
            \vspace{-\baselineskip}
            \begin{align}
            f_1 &= a + b &\\
            f_2 &= a - b &
            \end{align}
        \end{minipage}%
    \quad
        \sbox{0}{%
            $\begin{array}{c @{\medspace}c @{\medspace}l}
                a &= &\text{Some one line text}\\
                b &= &\text{Some two line text}\\
                & &\text{The second line}
            \end{array}$%
        }%
        \usebox{0}%
    \quad
        \begin{minipage}{\dimexpr .75\linewidth-2em-\wd0 \relax}
            This is detailed description of the equation.  Note how the two
            equations are both centered with respect to what is mentioned here.
            Such code could be so useful to give comments for tutorials and the
            like.
        \end{minipage}%
    \end{center}

\end{document}

谨防：不要删除任何%角色！

输出如下：

添加

我和 @AboAmmar 一样，最初也想过使用环境tabularx。不过，我们还是尊重 OP 的愿望，让中间一列有其自然宽度：

\documentclass[a4paper]{book}
\usepackage{mathtools} % automatically loads "amsmath" too
\usepackage{tabularx}



\begin{document}

\noindent
You can use multiple \texttt{minipage} environments for side-by-side
descriptions (some more text to show where the right margin is):
%
\begin{center} % The main purpose of this environment is to limit the scope of 
               % the following "\renewcommand"; additionally, it supplies 
               % appropriate vertical space.
\renewcommand*{\tabularxcolumn}[1]{m{#1}}
\noindent
\begin{tabularx}{\linewidth}{@{}m{.25\linewidth}@{\quad}c@{\quad}X@{}}
\begin{align}
  f_1 = a + b \\
  f_2 = a - b 
\end{align}
&
$\displaystyle
\begin{aligned}
 a ={} &\text{Some one line text}\\
 b ={} &\text{Some two line text}\\
       &\text{The second line}
\end{aligned}
$
&
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.
\end{tabularx}
\end{center}
%
Some text below the environment.

\end{document}

以下是相应的输出：

Answer

为什么你说其他答案中的代码不起作用？

\documentclass[a4paper]{book}
\usepackage{mathtools} % automatically loads "amsmath" too



\begin{document}

    \noindent
    You can use multiple \texttt{minipage} environments for side-by-side
    descriptions (some more text to show where the right margin is):
    
    \begin{center}
        \begin{minipage}{.25\linewidth}
            \vspace{-\baselineskip}
            \begin{align}
            f_1 &= a + b &\\
            f_2 &= a - b &
            \end{align}
        \end{minipage}%
    \quad
        \sbox{0}{%
            $\begin{array}{c @{\medspace}c @{\medspace}l}
                a &= &\text{Some one line text}\\
                b &= &\text{Some two line text}\\
                & &\text{The second line}
            \end{array}$%
        }%
        \usebox{0}%
    \quad
        \begin{minipage}{\dimexpr .75\linewidth-2em-\wd0 \relax}
            This is detailed description of the equation.  Note how the two
            equations are both centered with respect to what is mentioned here.
            Such code could be so useful to give comments for tutorials and the
            like.
        \end{minipage}%
    \end{center}

\end{document}

谨防：不要删除任何%角色！

输出如下：

添加

我和 @AboAmmar 一样，最初也想过使用环境tabularx。不过，我们还是尊重 OP 的愿望，让中间一列有其自然宽度：

\documentclass[a4paper]{book}
\usepackage{mathtools} % automatically loads "amsmath" too
\usepackage{tabularx}



\begin{document}

\noindent
You can use multiple \texttt{minipage} environments for side-by-side
descriptions (some more text to show where the right margin is):
%
\begin{center} % The main purpose of this environment is to limit the scope of 
               % the following "\renewcommand"; additionally, it supplies 
               % appropriate vertical space.
\renewcommand*{\tabularxcolumn}[1]{m{#1}}
\noindent
\begin{tabularx}{\linewidth}{@{}m{.25\linewidth}@{\quad}c@{\quad}X@{}}
\begin{align}
  f_1 = a + b \\
  f_2 = a - b 
\end{align}
&
$\displaystyle
\begin{aligned}
 a ={} &\text{Some one line text}\\
 b ={} &\text{Some two line text}\\
       &\text{The second line}
\end{aligned}
$
&
This is detailed description of the equation. Note how the two equations are both centered with respect to what is mentioned here. Such code could be so useful to give comments for tutorials and the like.
\end{tabularx}
\end{center}
%
Some text below the environment.

\end{document}

以下是相应的输出：

添加

答案1

答案2

答案3

答案4

添加

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