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如何在简单分数消除示例中添加其他数字

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如何在简单分数消除示例中添加其他数字 
\documentclass{article}

\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{shapes.misc}

\newcommand{\strikeout}[1]{% 
  \ifmmode% 
    \tikz[inner sep=0.5pt,baseline] \node [strike out,draw=black,anchor=text]{${}#1{}$};% 
  \else% 
    \tikz[inner sep=0.5pt,baseline] \node [strike out,draw=black,anchor=text]{#1};% 
  \fi% 
}

\begin{document}

\begin{align*}
\frac{4\strikeout{a}b}{\strikeout{9}}   \times  \frac{\strikeout{6}\strikeout{m}}    {\strikeout{a}c\strikeout{m}}  &=\frac{4b \times 2 }{3c}   \\
                            &= \frac{8b}{3c} \\
                            &=  \frac{8b}{3c}
\end{align*}

\end{document}

答案1

你想要这样的东西吗？

在此处输入图片描述

代码：

\documentclass{article}

\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{shapes.misc}

\newcommand{\strikeout}[1]{% 
  \ifmmode% 
    \tikz[inner sep=0.5pt,baseline] \node [strike out,draw=black,anchor=text]{${}#1{}$};% 
  \else% 
    \tikz[inner sep=0.5pt,baseline] \node [strike out,draw=black,anchor=text]{#1};% 
  \fi% 
}

\newcommand{\uprest}[1]{\!{}^{^{^{#1}}}\!\!}
\newcommand{\downrest}[1]{\!{}_{_{_{_{#1}}}}\!\!}

\begin{document}

\begin{align*}
\frac{4\strikeout{a}b}{\downrest{3}\strikeout{9}}   \times
\frac{\strikeout{6}\uprest{2}\strikeout{m}}{\strikeout{a}c\strikeout{m}}
                               &=\frac{4b \times 2 }{3c}   \\
                               &= \frac{8b}{3c} \\
                               &=  \frac{8b}{3c}
\end{align*}

\end{document}

否则，该cancel包提供了一个\cancelto命令：

\documentclass{article}

\usepackage{amsmath}

\usepackage{cancel}

\begin{document}

\begin{align*}
\frac{4\cancel{a}b}{\cancelto{3}{9}}   \times  
\frac{\cancelto{2}{6}\cancel{m}}{\cancel{a}c\cancel{m}}  
                               &=\frac{4b \times 2 }{3c}   \\
                               &= \frac{8b}{3c} \\
                               &=  \frac{8b}{3c}
\end{align*}

\end{document}

输出：

在此处输入图片描述

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