tính 879 + 109
Giải thích
\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{879}\\{109}\end{array}} \\\,\,\,\,988\end{array}\) | \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{156}\\{\,\,\,50}\end{array}} \\\,\,\,\,206\end{array}\) | \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{356}\\{182}\end{array}} \\\,\,\,\,538\end{array}\) | \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{791}\\{121}\end{array}} \\\,\,\,912\end{array}\) | \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{256}\\{319}\end{array}} \\\,\,\,\,575\end{array}\) | \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{622}\\{290}\end{array}} \\\,\,\,\,912\end{array}\) |