cross the word from left-bottom to up-right, just like cancel it:\usepackage{cancel}
$\cancel{abcd}$
put something above equation '=' or similiar:
\newcommand{\iseq}{\ensuremath {\stackrel {\mathrm {?}}{=}}}
$a \iseq b$
for all the title format things, try package:\usepackage{titlesec}
scale words:\usepackage{graphicx}
\scalebox{horizontal scale factor}[vertical scale factor]{content}
%\scalebox{3}[1]{abcd}
You can only see the result after changing to PDF.
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