方程式另起一行，而不是在多列中排列

Question

每个方程式都应直接位于其列表旁边，即 a) 的右侧，而不是其下方，只是想知道如何修复它，以及我的标记是否可以提高效率。它目前的样子：

\documentclass[fleqn]{article}
\usepackage{amsmath}
\usepackage{multicol}
\usepackage{enumerate}
\begin{document}
\begin{enumerate}
\item \begin{equation*} \text{Factorise the following} \end{equation*}
\begin{multicols}{2}
\begin{enumerate}[(a)]
    \item  \begin{equation*} \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x). \end{equation*}
    \item  \begin{equation*} \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x). \end{equation*}
    \item  \begin{equation*} \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x). \end{equation*}
    \item  \begin{equation*} \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x). \end{equation*}
    \item  \begin{equation*} \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x). \end{equation*}
    \item  \begin{equation*} \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x). \end{equation*}
\end{enumerate}
\end{multicols}
\end{enumerate}

Answer 1

可以使用内联数学来代替枚举编号下方的显示方程环境。\displaystyle选择显示方程的设置。

\documentclass[fleqn]{article}
\usepackage{amsmath}
\usepackage{multicol}
\usepackage{enumerate}
\begin{document}
\begin{enumerate}
\item Factorise the following:
\begin{multicols}{2}
\begin{enumerate}[(a)]
    \item  $\displaystyle \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x)$.
    \item  $\displaystyle \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x)$.
    \item  $\displaystyle \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x)$.
    \item  $\displaystyle \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x)$.
    \item  $\displaystyle \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x)$.
    \item  $\displaystyle \frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x)$.
\end{enumerate}
\end{multicols}
\end{enumerate}
\end{document}

结果：

编辑：添加了沃纳的中心方程的想法。

\documentclass[fleqn]{article}
\usepackage{amsmath}
\usepackage{multicol}
\usepackage{enumerate}
\newenvironment{cmath}{%
  \leavevmode
  \hfill
  $\displaystyle
}{%
  $\hfill\null
}
\begin{document}
\begin{enumerate}
\item Factorise the following:
\begin{multicols}{2}
\begin{enumerate}[(a)]
    \item  \begin{cmath}\frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x).\end{cmath}
    \item  \begin{cmath}\frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x).\end{cmath}
    \item  \begin{cmath}\frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x).\end{cmath}
    \item  \begin{cmath}\frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x).\end{cmath}
    \item  \begin{cmath}\frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x).\end{cmath}
    \item  \begin{cmath}\frac{d}{dx}\left( \int_{0}^{x},du\right)=f(x).\end{cmath}
\end{enumerate}
\end{multicols}
\end{enumerate}
\end{document}

结果：