Question

Матрицы Определители.

Answer 1

Ответ:

$\left(\begin{array}{ccc}5&2\\-7&1\end{array}\right)\cdot \left(\begin{array}{ccc}-2&4&8\\0&2&3\end{array}\right)=\left(\begin{array}{ccc}-10&24&46\\14&-26&-53\end{array}\right)\\\\\\\\c_{11}=-5\cdot 2+2\cdot 0=10\ \ ,\ \ c_{12}=5\cdot 4+2\cdot 2=24\ \ ,\ \ c_{13}=5\cdot 8+2\cdot 3=46\\\\c_{21}=-7\cdot (-2)+1\cdot 0=14\ ,\ c_{22}=-7\cdot 4+1\cdot 2=-26\ ,\ c_{23}=-7\cdot 8+1\cdot 3=-53$