对齐环境中的文本

Question

文本是否可能从等式的第二行开始？

\documentclass[a4paper,10pt]{article}
\usepackage{amsmath}

\begin{document}
\begin{itemize}
\item First thing:
      $\begin{aligned}[t]
      c^2&=a^2+b^2\\
      d^2&=e^2+f^2
      \end{aligned},$
      where $a,b$ and $c$ are supposed to be real numbers and $d,e$ and $f$ complex numbers, respectively.
\end{itemize}
\end{document}

Answer 1

我会做 3 或 4

\documentclass[a4paper,10pt]{article}
\usepackage{amsmath}

\begin{document}
\begin{enumerate}
\item First thing:
      $\begin{aligned}[t]
      c^2&=a^2+b^2\\
      d^2&=e^2+f^2
      \end{aligned},$
      where $a,b$ and $c$ are supposed to be real numbers and $d,e$ and $f$ complex numbers, respectively.
\item First thing:
      \begin{align*}
      c^2&=a^2+b^2\\
      d^2&=e^2+f^2
      \end{align*}
      where $a,b$ and $c$ are supposed to be real numbers and $d,e$ and $f$ complex numbers, respectively.
\item First thing:\vspace{-5pt}
      \begin{align*}
      c^2&=a^2+b^2\\
      d^2&=e^2+f^2
      \end{align*}
      where $a,b$ and $c$ are supposed to be real numbers and $d,e$ and $f$ complex numbers, respectively.
\item First thing:
      $\begin{aligned}[t]
      c^2&=a^2+b^2\\
      d^2&=e^2+f^2
      \end{aligned},$

      where $a,b$ and $c$ are supposed to be real numbers and $d,e$ and $f$ complex numbers, respectively.

\item \mbox{}\\[-10pt]\raisebox{17pt}{First thing:}
      $\begin{aligned}[b]
      c^2&=a^2+b^2\\
      d^2&=e^2+f^2
      \end{aligned},$
      where $a,b$ and $c$ are supposed to be real numbers and $d,e$ and $f$ complex numbers, respectively.
\end{enumerate}



\end{document}