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Ответ:

[tex]C_1=\left[\begin{array}{ccc}-47&9&25\\11&13&-10\\28&5&24\end{array}\right],C_2=\left[\begin{array}{ccc}1&-17&0\\26&6&7\\47&15&-4\end{array}\right][/tex]

Пошаговое объяснение:

[tex]\displaystyle A=\left[\begin{array}{ccc}-7&3&5\\4&2&1\\8&1&3\end{array}\right] ,B=\left[\begin{array}{ccc}4&2&0\\3&-1&5\\4&0&-3\end{array}\right];[/tex]

[tex]a)\displaystyle C_1=5A-3B=\left[\begin{array}{ccc}5*(-7)&5*3&5*5\\5*4&5*2&5*1\\5*8&5*1&5*3\end{array}\right]-\left[\begin{array}{ccc}3*4&3*2&3*0\\3*3&3*(-1)&3*5\\3*4&3*0&3*(-3)\end{array}\right] =\left[\begin{array}{ccc}-35&15&25\\20&10&5\\40&5&15\end{array}\right] -\left[\begin{array}{ccc}12&6&0\\9&-3&15\\12&0&-9\end{array}\right] =\left[\begin{array}{ccc}-47&9&25\\11&13&-10\\28&5&24\end{array}\right];[/tex]

[tex]b)C_2=A*B=\displaystyle \left[\begin{array}{ccc}-7&3&5\\4&2&1\\8&1&3\end{array}\right] *\left[\begin{array}{ccc}4&2&0\\3&-1&5\\4&0&-3\end{array}\right]=\left[\begin{array}{ccc}-28+9+20&-14-3+0&15-15\\16+6+4&8-2&10-3\\32+3+12&16-1&5-9\end{array}\right][/tex][tex]\displaystyle =\left[\begin{array}{ccc}1&-17&0\\26&6&7\\47&15&-4\end{array}\right][/tex]