Сначала вычислим 2А:
2А = 2 * $$tex$$\left[\begin{array}{ccc}1&2&2\2&3&4\1&3&2\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}2&4&4\4&6&8\2&6&4\end{array}\right]$$/tex$$

Затем вычислим 3АВ:
3АВ = 3 $$tex$$\left[\begin{array}{ccc}1&2&2\2&3&4\1&3&2\end{array}\right]$$/tex$$ $$tex$$\left[\begin{array}{ccc}2&2&-1\-1&5&3\-2&4&3\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}6+8-8&12+10+6&2-8+4\12+18-16&24+15+12&4-24+12\6+18-8&12+15+8&2-24+6\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}6&28&-2\14&51&-8\16&35&-16\end{array}\right]$$/tex$$

3АВ= $$tex$$\left[\begin{array}{ccc}6+4\14+6\6+4\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}10\20\10\end{array}\right]$$/tex$$

Теперь найдем 2А+3АВ:
2А+3АВ = $$tex$$\left[\begin{array}{ccc}2&4&4\4&6&8\2&6&4\end{array}\right]$$/tex$$ + $$tex$$\left[\begin{array}{ccc}10\20\10\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}2+10&4+20&4+10\4+14&6+51&8+10\2+16&6+35&4+16\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}12&24&14\18&57&18\18&41&20\end{array}\right]$$/tex$$

Теперь добавляем -7В:
2А+3АВ-7В = $$tex$$\left[\begin{array}{ccc}12&24&14\18&57&18\18&41&20\end{array}\right]$$/tex$$ + 7 * $$tex$$\left[\begin{array}{ccc}2&2&-1\-1&5&3\-2&4&3\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}12&24&14\18&57&18\18&41&20\end{array}\right]$$/tex$$ + $$tex$$\left[\begin{array}{ccc}14&14&-7\-7&35&21\-14&28&21\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}12+14&24+14&14+(-7)\18+(-7)&57+35&18+21\18+(-14)&41+28&20+21\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}26&38&7\11&92&39\4&69&41\end{array}\right]$$/tex$$

Итак, значения выражения 2А+3АВ-7В + 4 равно:
$$tex$$\left[\begin{array}{ccc}26+4&38+4&7+4\11+4&92+4&39+4\4+4&69+4&41+4\end{array}\right]$$/tex$$ = $$tex$$\left[\begin{array}{ccc}30&42&11\15&96&43\8&73&45\end{array}\right]$$/tex$$