tính 25 + 26

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{25}\\{26}\end{array}} \\\,\,\,\,51\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{63}\\{34}\end{array}} \\\,\,\,\,29\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{19}\\{58}\end{array}} \\\,\,\,\,77\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{83}\\{55}\end{array}} \\\,\,\,\,28\end{array}\)