tính 65 + 25 

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{65}\\{25}\end{array}} \\\,\,\,\,90\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{50}\\{36}\end{array}} \\\,\,\,\,14\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{52}\\{18}\end{array}} \\\,\,\,\,70\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{92}\\{75}\end{array}} \\\,\,\,\,17\end{array}\)