Question

alguém sabe a resposta desta por favor​

Answer 1

$\left[\begin{array}{ccc}1&3&5\\0&-1&-2\\4&0&1\end{array}\right] \ \left[\begin{array}{ccc}1&3\\0&-1\\4&1\end{array}\right]\\\\\\D = 1\cdot(-1)\cdot1+3\cdot(-2)\cdot4+5\cdot0\cdot1-(3\cdot0\cdot1+1\cdot(-2)\cdot 0 + 5 \cdot (-1) \cdot 4)\\D = -1 -24+0-(0+0-20)\\D = -25 - (-20)\\D = -25 + 20\\\boxed{D = -5}$