tính 83 – 56

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{83}\\{56}\end{array}} \\\,\,\,\,27\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{58}\\{24}\end{array}} \\\,\,\,\,82\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{97}\\{78}\end{array}} \\\,\,\,\,19\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{32}\\{29}\end{array}} \\\,\,\,\,61\end{array}\)