tính 17 + 46 

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{17}\\{46}\end{array}} \\\,\,\,\,63\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{80}\\{53}\end{array}} \\\,\,\,\,27\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{63}\\{\,\,\,8}\end{array}} \\\,\,\,\,71\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{70}\\{38}\end{array}} \\\,\,\,\,32\end{array}\)