tính 687 - 293
Giải thích
\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{687}\\{293}\end{array}} \\\,\,\,\,394\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{979}\\{680}\end{array}} \\\,\,\,\,299\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{793}\\{586}\end{array}} \\\,\,\,\,207\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{979}\\{\,\,\,94}\end{array}} \\\,\,\,\,885\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{578}\\{198}\end{array}} \\\,\,\,\,380\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{777}\\{\,\,\,68}\end{array}} \\\,\,\,\,709\end{array}\) |