Question

Вычислить определители.

Answer 1

$\left|\begin{array}{cc}3&-4\\1&2\end{array}\right| =3\cdot 2-1\cdot (-4)=6+4=10\\\\\\ \left|\begin{array}{cc}3&6\\5&10\end{array}\right| =3\cdot 10-5\cdot 6=30-30=0$