答案1
首先:不要這樣做!LaTeX 和 MathJax 是陌生人,而不是朋友!
像這樣?
\documentclass{article}
\usepackage{enumerate}
\usepackage{lipsum}
\begin{document}
\lipsum[1]
\begin{enumerate}[(A)]
\item Hello World
\item \begin{enumerate}[(1)]
\item This is some math
\[1+2=3\qquad4+5=6\]
\item This is another item
\item \lipsum[2]
\end{enumerate}
\item Something more
\end{enumerate}
\end{document}