Question

calcular cada um dos de terminantes
a seguir, t tilizando a regra de sarrus
1. 2. 3
3. 4. 5
1 2. 5 ​

Answer 1

$\begin{vmatrix}1&2&3\\3&4&5\\1&2&5\end{vmatrix}\begin{vmatrix}1&2\\3&4\\1&2\end{vmatrix}$

$\mathsf{1.4.5+2.5.1+3.3.2}\\\mathsf{-2.3.5-1.5.2-3.4.1}\\\mathsf{20+10+18-30-10-12=-4}$