Tính: \[\begin{array}{l} \times \begin{array}{*{20}{c}}{23}\\{\underline {\,\,\,4} }\end{array}\\\,\,\,\,....\end{array}\] \[\begin{array}{l} \times \begin{array}{*{20}{c}}{18}\\{\underl
Giải thích
\[\begin{array}{l} \times \begin{array}{*{20}{c}}{23}\\{\underline {\,\,\,4} }\end{array}\\\,\,\,92\end{array}\] | \[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,18}\\{\underline {\,\,\,\,\,7} }\end{array}\\\,\,\,126\end{array}\] | \[\begin{array}{l} \times \begin{array}{*{20}{c}}{36}\\{\underline {\,\,\,2} }\end{array}\\\,\,\,72\end{array}\] | \[\begin{array}{l} \times \begin{array}{*{20}{c}}{15}\\{\underline {\,\,\,5} }\end{array}\\\,\,\,75\end{array}\] | \[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,42}\\{\underline {\,\,\,\,\,4} }\end{array}\\\,\,\,168\end{array}\] |