我在下列数学运算中输入分隔符时遇到困难。
如果有人能给我一个解决方案，我将不胜感激。请参见下面的尝试，它没有完全显示所需的输出，分隔符的长度不正确（尝试 1）和不需要的垂直空间（尝试 2）。
\documentclass{article}
\usepackage{amsmath}
\begin{document}
First Trying:
$$\dfrac{\dfrac{\dfrac{\partial f( x_{1}, x_{2}, x_{3})}{\partial x_{1}}
\bigg|_{ x_{1}= 0}}{\partial x_{2}} \bigg|_{ x_{2}= 0}}{\partial x_{3}}\
\bigg|_{ x_{3}= 0}=\dfrac{A}{B}$$
Second Trying:
$$
\left.\dfrac{
\left.\dfrac{
\left.\dfrac{\partial f(x_{1}, x_{2}, x_{3})}{\partial x_{1}}\right|_{x_{1}=0}}
{\partial x_{2}}\right|_{x_{2}=0}}{\partial x_{3}}\right|_{x_{3}=0}=\dfrac{A}{B}
$$
\end{document}
答案1
变体我的答案。请随意更改命令的名称。
答案2
这个肮脏的黑客价值怎么样blkarray？
\documentclass{article}
\usepackage{amsmath}
\usepackage{blkarray}
\begin{document}
\[ \begin{blockarray}{r|l}
\dfrac{%
\left.\dfrac{
\left.\dfrac{\partial f(x_{1}, x_{2}, x_{3})}{\partial x_{1}}\right|_{x_{1}=0}}
{\partial x_{2}}\right|_{x_{2}=0}}{\partial x_{3}}&_{\rule{0pt}{3ex}\mkern-10mu x_{3}=0} =\dfrac{A}{B}
\end{blockarray} \]
\end{document}
