Điền vào ô trống

14/15

Điền vào ô trống

\[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,\,21}\\{\underline {\,\,\,\,14} }\end{array}\\\,\,\,.......\\\,\,\,\underline {.......} \\\,\,\,.......\end{array}\]

\[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,\,\,52}\\{\underline {\,\,\,\,16} }\end{array}\\\,\,\,.......\\\,\,\,\underline {.......} \\\,\,\,.......\end{array}\]

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Hướng dẫn giải

\[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,\,21}\\{\underline {\,\,\,\,14} }\end{array}\\\,\,\,\,\,\,\,84\\\,\,\,\underline {21\,\,\,\,\,} \\\,\,\,294\end{array}\]

\[\begin{array}{l} \times \begin{array}{*{20}{c}}{\,\,\,\,52}\\{\underline {\,\,\,16} }\end{array}\\\,\,\,312\\\,\,\,\underline {52\,\,\,\,} \\\,\,\,832\end{array}\]