tính 77 + 15
Giải thích
\(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{77}\\{15}\end{array}} \\\,\,\,\,92\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{91}\\{17}\end{array}} \\\,\,\,\,74\end{array}\) | \(\begin{array}{l}\underline { + \begin{array}{*{20}{c}}{19}\\{27}\end{array}} \\\,\,\,\,46\end{array}\) |