Đi đến nội dung chính\(\require{cancel}\require{mathtools}\require{color}\require{boldsymbol}\newcommand{\N}{\mathbb{N}}
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\newcommand{\samat}[1]{\left\langle\begin{smallmatrix}#1\end{smallmatrix}\right\rangle}
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\definecolor{fillinmathshade}{gray}{0.9}
\newcommand{\fillinmath}[1]{\mathchoice{\colorbox{fillinmathshade}{$\displaystyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\textstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptstyle \phantom{\,#1\,}$}}{\colorbox{fillinmathshade}{$\scriptscriptstyle\phantom{\,#1\,}$}}}
\)
Chương 1 Số Thực. Mở Rộng Số Thực Theo Chiều Dọc Và Chiều Ngang
The introduction of the chapter.
