tính 38 + 19

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{38}\\{19}\end{array}} \\\,\,\,\,57\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{76}\\{\,\,\,8}\end{array}} \\\,\,\,\,68\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{46}\\{15}\end{array}} \\\,\,\,\,61\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{83}\\{34}\end{array}} \\\,\,\,\,49\end{array}\)