\documentclass[12pt]{article}
\usepackage{fourier}
\usepackage[utf8]{vietnam}
\usepackage{times}
\usepackage{amsmath}
\usepackage{xintexpr}
\usepackage[paperwidth=21cm,paperheight=17cm,left=1cm,
right=2cm,top=1cm,bottom=1.5cm]{geometry}
\begin{document}
\parindent=0pt
\def\allowsplits #1{\ifx #1\relax \else #1\hskip 0pt plus 1pt\relax
\expandafter\allowsplits\fi}%
\def\printnumber #1{\expandafter\allowsplits \romannumeral-`0#1\relax }%
\def\x{2026}
$A=\dfrac{10^{\x}-18325}{81}=$\bigskip
\parbox{19cm}{\printnumber{\xintiieval{irem((10^(\x)-18235),81)}}\newline }
\end{document}
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