Question

me ajudem nessas atividades do classroom pfvv ​

Answer 1

Explicação passo-a-passo:

1)

$D=\left|\begin{array}{ccc}3&2\\-4&1\\\end{array}\right|\\\\D=3.1-2.(-4)\\\\D=3+8\\\\\boxed{\boxed{D=11}}$

2)

$D=\left|\begin{array}{ccc}2&1&3\\3&0&4\\-4&5&7\end{array}\right|\\\\\\\text Usando\ a\ Regra\ de\ Sarrus:\\\\D=\left|\begin{array}{ccc}2&1&3\\3&0&4\\-4&5&7\end{array}\right|\left\begin{array}{ccc}2&1\\3&0\\-4&5\end{array}\right|\\\\\\D=2.0.7+1.4.(-4)+3.3.5-1.3.7-2.4.5-3.0.(-4)\\\\D=0-16+45-21-40-0\\\\\boxed{\boxed{D=-32}}$