1.

\left. \begin{array} { | c | c | c | c | } \hline 81 & { 9 } & { 3 } \\ \hline ? & { 25 } & { 5 } \\ \hline 16 & { 4 } & { 2 } \\ \hline \end{array} \right.

Answer»

that answer must be 625



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