%------
\documentclass{article}%
\usepackage[Smaller]{cancel}%옵션 thicklines을 쓰면 상쇄 표시가 진하게 됨
 %옵션 Smaller을 쓰면 \cancelto{B}{A}의 B의 글씨가 scriptsize가 됨

\begin{document}

\begin{equation}\label{1}
    a \hskip-5pt / + b -a \hskip-5pt / = b
\end{equation}
\begin{equation}\label{2}
    \cancel{(a-b)^2} + b\ \cancel{-(a^2-2ab+b^2)} = b
\end{equation}
\begin{equation}\label{3}
 \bcancel{(a-b)^2} + b\ \bcancel{-(a^2-2ab+b^2)} = b
\end{equation}
\begin{equation}\label{4}
 \xcancel{(a-b)^2} + b\ \xcancel{-(a^2-2ab+b^2)} = b
\end{equation}
\begin{equation}\label{5}
 b + \cancelto{(a-b)^2}{(a^2-2ab+b^2)} = b + (a-b)^2
\end{equation}

\end{document}

\documentclass[12pt]{article}
\usepackage{cancel}
\usepackage{amsmath}

\begin{document}
\[
\frac{\,\mathop{\cancel{5}}\limits^{1}\,}{\,\mathop{\cancel{8}}\limits_{1}\,}
 \times
 \frac{\,\mathop{\cancel{16}}\limits^{2}\,}{\,\mathop{\cancel{15}}\limits_{3}\,}
 =\frac{2}{3}
\]
$$ {\mathop{\cancel{5}}^{1}}\quad ... \quad {\mathop{\cancel{15}}_{3}} $$
\end{document}

1. 먼저 해당 단추(예로서 Sans)를 누르면 \textsf{}가 화면에 입력되고 커서(I)가 묶음표 {} 내에서 껌벅거리고 있습니다. 이때 자판에서 글자를 입력합니다.
2. 먼저 글자를 자판에서 입력하고 화면에서 원하는 부분을 선택한 후 해당 단추를 누르면 됩니다. 그리고 빨강 X 는 맨 나중의 선택을 취소하는 것이고, 반복하여 여러 번 누르면 거꾸로 거슬어 올라가면서 취소합니다. 파랑 X 는 Verbatim만 취소하는 것입니다.
   
   

Table 18: Text-mode Accents 
Table 19: tipa Text-mode Accents
Table 20: extraipa Text-mode Accents
Table 21: wsuipa Text-mode Accents
Table 22: phonetic Text-mode Accents
Table 23: metre Text-mode Accents
Table 24: t4phonet Text-mode Accents
Table 25: arcs Text-mode Accents

 Table 10: tipa Phonetic Symbols
 Table 11: tipx Phonetic Symbols
 Table 13: wsuipa Phonetic Symbols
 Table 14: wasysym Phonetic Symbols
 Table 15: phonetic Phonetic Symbols
 Table 16: t4phonet Phonetic Symbols

 "Table 29: textcomp Currency Symbols"

\documentclass{article}
\usepackage{ulem}
\begin{document}
Double underlining  (\uuline{under-line}),\\
a wavy underline    (\uwave{under-wave}), \\
a line through text (\sout{strike out}),  \\
crossing out text (\xout{cross out, X out}),
\end{document}

\begin{dingautolist}{202}
 \item \ding{172}, \ding{173}, \ding{174}, \ding{175}
 \item \ding{182}, \ding{183}, \ding{184}, \ding{185}
 \item \ding{192}, \ding{193}, \ding{194}, \ding{195}
 \item \ding{43}, \ding{51}, \ding{64}
 \item \ding{33}, \ding{34}, \ding{35}
 \item \ding{247}, \ding{248}, \ding{249}
 \item \ding{51}, \ding{52}, \ding{52}
 \item \ding{60}, \ding{61}, \ding{64}
\end{dingautolist}

\begin{enumerate}
 \item[\ding{172}] \ding{182}, \ding{192}, \ding{202}
 \item[\ding{173}] \ding{183}, \ding{193}, \ding{203}
 \item[\ding{174}] \ding{184}, \ding{194}, \ding{204}
 \item[\ding{175}] \ding{185}, \ding{195}, \ding{205}
\end{enumerate}

\begin{quote}
 \ding{172}, \ding{182}, \ding{192}, \ding{202}
 \ding{173}, \ding{183}, \ding{193}, \ding{203}
 \ding{174}, \ding{184}, \ding{194}, \ding{204}
 \ding{175}, \ding{185}, \ding{195}, \ding{205}
\end{quote}

\documentclass[12pt]{article}
\usepackage{harmony}
\usepackage{hfont}
\begin{document}
 \textcircled{\small 가} \textcircled{\small 나}
 \textcircled{\small 다} \textcircled{\small 라}

 \Kr{가} \Kr{나} \Kr{다} \Kr{라}

\end{document}