需要将第一个表格左对齐，将第二个表格右对齐，并位于第一个表格结束位置的下方

Question

\begin{table}
\centering
\begin{displaymath}
\begin{array}{|c c c c|} 
\hline

    1000\textsuperscript{3}  & 
    100\textsuperscript{2} & 
    10\textsuperscript{1} & 1\textsuperscript{0}\\
    1000 & 100 & 10 & 1\\
    1 & 2 & 3 & 4\textsubscript{10}\\
    \hline
\end{array}
\end{displaymath}
\caption{\label{tab:bool1}Base 10.}
\end{table}


\begin{table}
\begin{displaymath}
\begin{array}{|c c c c c|}
\hline

1 & x & 4  &    = &     4\\
10 & x & 3  & = &   30\\
100 & x & 2  &  = &   200 \\
1000 & x & 1 & = & 1000\\

& & & & =====\\
& & & & 1234\textsubscript{10}\\
\hline

\end{array}
\end{displaymath}
\end{table}

Answer 1

像这样？

\documentclass{article}
\usepackage{hhline,tabularx}
    \newcolumntype{L}{>{\raggedright\arraybackslash}X}
    \newcolumntype{R}{>{\raggedleft\arraybackslash}X}

\begin{document}
    \begin{table}[ht]
    \centering
\begin{tabularx}{0.75\linewidth}{R@{}L}
    $\begin{array}{|c c c c|}
        \hline
    1000^3  & 100^2 & 10^1  & 1^0   \\
    1000    & 100   & 10    & 1     \\
    1       & 2     & 3     & 4^10  \\
        \hline
    \end{array}$
\caption{Base 10.}
\label{tab:bool1}       &       \\
                        & $\begin{array}{|c c c c c c@{}|}
                            \hline
                        1       & x & 4 & = & 4         &   \\
                        10      & x & 3 & = & 30        &   \\
                        100     & x & 2 & = & 200       &   \\
                        1000    & x & 1 & = & 1000      &   \\
                            \hhline{|~~~~=~|}
                                &   &   &   & 1234_{10} &   \\
                            \hline
                        \end{array}$
\end{tabularx}
    \end{table}
\end{document}