Cho hay nhất ạ.

\(\begin{array}{l}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{2\,1\,5\,6\,1\,\,\,\,\,\,\,\,\,\,}\\{\quad\quad4\,7\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{\,\,\,\,\;\;\,2\,1\,6\,0\,8\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\end{array}\)$\quad$\(\begin{array}{l}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{2\,1\,6\,4\,1\,\,\,\,\,\,\,\,\,\,}\\{\quad\quad4\,7\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{\,\,\,\,\;\;\,2\,1\,6\,8\,8\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\end{array}\) $\\$\(\begin{array}{l}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{2\,1\,6,9\,9\,\,\,\,\,\,\,\,\,\,}\\{\quad\quad\,\,4\,7\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{\,\,\,\,\;\;\,\,\,2\,1\,7\,4\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\end{array}\)$\quad$\(\begin{array}{l}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{2\,1\,7\,5\,7\,\,\,\,\,\,\,\,\,\,}\\{\quad\quad4\,7\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{\,\,\,\,\;\;\,2\,1\,8\,0\,4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\end{array}\)$\\$\(\begin{array}{l}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{2\,1\,8\,8\,5\,\,\,\,\,\,\,\,\,\,}\\{\quad\quad4\,7\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{\,\,\,\,\;\;\,2\,1\,9\,3\,2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\end{array}\)$\quad$ \(\begin{array}{l}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{2\,1\,9\,8\,4\,\,\,\,\,\,\,\,\,\,}\\{\quad\quad4\,7\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{\,\,\,\,\;\;\,2\,2\,0\,3\,1\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\end{array}\)$\\$\(\begin{array}{l}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{2\,2\,2\,1\,9\,\,\,\,\,\,\,\,\,\,}\\{\quad\quad4\,7\,\,\,\,\,\,\,\,\,\,\,}\end{array}}\\\hline{\,\,\,\,\;\;\,2\,2\,2\,6\,6\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}\end{array}\end{array}\)