Question

Atividade de matemática 2 questões

Answer 1

Ryan,
Muitas perguntas numa tarefa só
Vou ajudar com algumas

19)
           a)
                     $3A= \left[\begin{array}{ccc}1x3&&3x3\\&&\\2x3&&4x3\end{array}\right] = \left[\begin{array}{ccc}3&&9\\&&\\6&&12\end{array}\right]$
 
           b)
                    $A+B= \left[\begin{array}{ccc}1+2&&3-1\\&&\\2+4&&4+0\end{array}\right] = \left[\begin{array}{ccc}3&&2\\&&\\6&&4\end{array}\right] \\ \\ \frac{1}{3}(A+B)= \left[\begin{array}{ccc}1&& \frac{2}{3} \\&&\\2&& \frac{4}{3} \end{array}\right]$
 
          c)
                  $2A- \frac{1}{3} B \\ \\ = \left[\begin{array}{ccc}2&&6\\&&\\4&&8\end{array}\right] - \left[\begin{array}{ccc} \frac{2}{3} &&- \frac{1}{3} \\&&\\ \frac{4}{3} &&0\end{array}\right] \\ \\ = \left[\begin{array}{ccc}2- \frac{2}{3} &&6+ \frac{1}{3} \\&&\\4- \frac{4}{3} &&8-0\end{array}\right] = \left[\begin{array}{ccc} \frac{4}{3} && \frac{19}{3} \\&&\\ \frac{8}{3} &&8\end{array}\right]$