![如何写上面的分数 - 字体问题](https://linux22.com/image/474043/%E5%A6%82%E4%BD%95%E5%86%99%E4%B8%8A%E9%9D%A2%E7%9A%84%E5%88%86%E6%95%B0%20-%20%E5%AD%97%E4%BD%93%E9%97%AE%E9%A2%98.png)
我正在尝试编写一份数学文档,但遇到了以下问题。我想创建如下分数:
我用来创建它的代码是这样的:
\documentclass[twoside,a4paper,leqno]{book}
%%%%%%%%%%% no empty pages %%%%%%%%%%%%%%%%%%%%%%%
\renewcommand\cleardoublepage{%
\clearpage
\ifodd\value{page}\else\stepcounter{page}\fi}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%% Packages %%%%%%%%%%%%%%%%%%%%%%
%\usepackage{xltxtra}
%\usepackage{amsfonts,amssymb,amsmath,calc}
\usepackage{mathtools}
\usepackage{extarrows}
%\usepackage{empheq}
\usepackage{amscd}
\usepackage{mathrsfs}
\usepackage{amsthm}
\usepackage{hyperref}
\hypersetup{colorlinks=true,linkcolor=blue,filecolor=magenta,urlcolor=cyan}
\usepackage{array}
%\usepackage{comment}
\usepackage{enumitem}
%\usepackage{varwidth}
\usepackage{tasks}
\usepackage{relsize}
%\usepackage{verbatim}
%\usepackage{pstricks-add}
%\usepackage{pgf,tikz}
%\usetikzlibrary{arrows}
\usepackage{tasks}
\usepackage[all]{xy}
\input xymatrix.tex
%\usepackage{tcolorbox}
%\newtcolorbox{mybox}{colback=blue!5!white,colframe=blue!75!black}
\usepackage[margin=0.75in]{geometry}
\usepackage{multicol}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
usepackage{graphicx}
\makeatletter
\DeclareFontFamily{U}{tipa}{}
\DeclareFontShape{U}{tipa}{m}{n}{<->tipa10}{}
\newcommand{\arc@char}{{\usefont{U}{tipa}{m}{n}\symbol{62}}}%
\newcommand{\arc}[1]{\mathpalette\arc@arc{#1}}
\newcommand{\arc@arc}[2]{%
\sbox0{$\m@th#1#2$}%
\vbox{
\hbox{\resizebox{\wd0}{\height}{\rotatebox[origin=bottom]{180}{\arc@char}}}
\nointerlineskip
\box0
}%
}
\makeatother
\newcommand{\stackAboveArc}[2]{\begin{array}[b]{@{}c@{}}#1\\ \arc{#2}\end{array}}
%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%% Document starts %%%%%%%%%%%%
\begin{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\[
\dfrac{\stackAboveArc{x}{\hphantom{a}x\hphantom{a}}}{(x-2)(x+2)}-\dfrac{\stackAboveArc{x+2}{\hphantom{aa}1\hphantom{aa}}}{x(x+2)} \]
\end{document}
在我的代码中也存在这个代码
% the next code replaces non-existent Olga Latin with GFSDidotItalic Latin
\XeTeXinterchartokenstate=1%
\newXeTeXintercharclass\GFSDidotoSubst%
\count255="0021%
\loop\ifnum\count255<"0341%
\XeTeXcharclass\count255=\GFSDidotoSubst%
\advance\count255 by 1%
\repeat%
\XeTeXinterchartoks 0 \GFSDidotoSubst = {\begingroup\GFSDidotoSubstFont}%
\XeTeXinterchartoks 4095 \GFSDidotoSubst = {\begingroup\GFSDidotoSubstFont}%
\XeTeXinterchartoks \GFSDidotoSubst 0 = {\endgroup}%
\XeTeXinterchartoks \GFSDidotoSubst 4095 = {\endgroup}%
当这个被启用时,分数就变成了这样
当禁用此代码时,无论我在何处使用任务环境,枚举都不可见,如下图所示:
如果有人能帮忙,请帮忙!谢谢。