tính 25 + 39
Giải thích
\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{25}\\{39}\end{array}} \\\,\,\,\,64\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{55}\\{28}\end{array}} \\\,\,\,\,27\end{array}\) | \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{35}\\{38}\end{array}} \\\,\,\,\,73\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{91}\\{36}\end{array}} \\\,\,\,\,55\end{array}\) |