tính 645 + 118

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{645}\\{118}\end{array}} \\\,\,\,\,763\end{array}\)

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{673}\\{524}\end{array}} \\\,\,\,\,149\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{175}\\{480}\end{array}} \\\,\,\,\,655\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{582}\\{\,\,\,\,\,8}\end{array}} \\\,\,\,590\end{array}\)