Question

Найти A-4B+E*A A= 1 2 -1 3 B = 0 -2 -2 5 E= 1 0 0 1

Answer 1

$\left[\begin{array}{ccc}1&2\\-1&3\end{array}\right] -4 \left[\begin{array}{ccc}0&-2\\-2&5\end{array}\right] + \left[\begin{array}{ccc}1&0\\0&1\end{array}\right] * \left[\begin{array}{ccc}1&2\\-1&3\end{array}\right] = \\ = \left[\begin{array}{ccc}1&2\\-1&3\end{array}\right] + \left[\begin{array}{ccc}0&8\\8&-20\end{array}\right]+ \left[\begin{array}{ccc}1&2\\-1&3\end{array}\right] = \\ = \left[\begin{array}{ccc}2&12\\6&-14\end{array}\right]$