Ta có:
\(\begin{array}{l}M = \left( {{{10}^2} - 1} \right).\left( {{{10}^2} - {2^2}} \right).\left( {{{10}^2} - {3^2}} \right).\,\,...\left( {{{10}^2} - {{10}^2}} \right)..\,\,.\left( {100 - {{50}^2}} \right)\\ = \left( {{{10}^2} - 1} \right).\left( {{{10}^2} - {2^2}} \right).\left( {{{10}^2} - {3^2}} \right).... 0 ...\left( {100 - {{50}^2}} \right)\\ = 0\end{array}\)