tính 16 + 48

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{16}\\{48}\end{array}} \\\,\,\,\,64\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{72}\\{25}\end{array}} \\\,\,\,\,47\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{55}\\{26}\end{array}} \\\,\,\,\,81\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{54}\\{38}\end{array}} \\\,\,\,\,16\end{array}\)