tính 23 + 38

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{23}\\{38}\end{array}} \\\,\,\,\,61\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{70}\\{51}\end{array}} \\\,\,\,\,19\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{65}\\{35}\end{array}} \\\,\,100\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{85}\\{56}\end{array}} \\\,\,\,\,29\end{array}\)