tính 498 + 391

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{498}\\{391}\end{array}} \\\,\,\,\,889\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{624}\\{\,\,\,66}\end{array}} \\\,\,\,\,690\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{724}\\{158}\end{array}} \\\,\,\,\,882\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{235}\\{456}\end{array}} \\\,\,\,\,691\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{427}\\{246}\end{array}} \\\,\,\,\,673\end{array}\)

\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{498}\\{270}\end{array}} \\\,\,\,\,768\end{array}\)