tính 728 + 55

\[\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{728}\\{\,\,\,55}\end{array}} \\\,\,\,\,783\end{array}\]

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{615}\\{385}\end{array}} \\\,\,\,\,230\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{575}\\{\,\,32}\end{array}} \\\,\,\,\,607\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{170}\\{125}\end{array}} \\\,\,\,\,\,\,45\end{array}\)