Question

sejam as matrizes: A) |2 1| |3 4|, B) |3 -1| |0 2| e C) |2 0 -2| |3 1 -1|. calcule a) A-B, b)A×B e c)B×C.

Answer 1

$\left[\begin{array}{ccc}2&1\\3&4\end{array}\right] - \left[\begin{array}{ccc}3&-1\\0&2\\\end{array}\right]$

$\left[\begin{array}{ccc}2 - 3&1 - (-1)\\3-0&4-2\end{array}\right]=\left[\begin{array}{ccc}-1&2\\3&2\end{array}\right] A - B$

$\left[\begin{array}{ccc}2&1\\3&4\end{array}\right] * \left[\begin{array}{ccc}3&-1\\0&2\\\end{array}\right]$

$\left[\begin{array}{ccc}2*3+1*0&2*-1+1*2\\3*3+4*0&3*-1+4*2\end{array}\right] =\left[\begin{array}{ccc}6&0\\9&5\\\end{array}\right] A*B$


$\left[\begin{array}{ccc}3&-1\\0&2\end{array}\right] * \left[\begin{array}{ccc}2&0&-2\\3&1&-1\end{array}\right] = \left[\begin{array}{ccc}3&-1&-5\\6&2&-2\end{array}\right] B*C$

espero ter ajudado