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2014-05-05T14:17:04-03:00
Pelo modo mais fácil... Determinante dividido por 2
A)  \left[\begin{array}{ccc}1&0&1\\4&2&1\\1&2&0\end{array}\right] = 8 - 4 =  \frac{4}{2}  = 2
B)  \left[\begin{array}{ccc}2&3&-1\\3&1&-2\\-1&0&2\end{array}\right] = 6+4-18-1 =  \frac{-9}{2} =|-4,5| = 4,5
C)  \left[\begin{array}{ccc}-1&2&-2\\2&3&-1\\0&1&1\end{array}\right] =-3-4-4-1 =  \frac{-12}{2} =|-6 |= +6
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