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Considere a matriz 5x5 abaixo
M=\left[ \begin {array}{ccccc} 2&0&1&-1&-3\\ 3&-1&2&-2&-8\\ -4&6&3&0&3\\ 5&9&4&2&6\\ 7&10&5&1&a\end {array} \right]
Se det (M)=0 , então
a =
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