Найдите матрицу
С=[tex]\left[\begin{array}{cc}1&-1\\3&1\\5&1\end{array}\right][/tex] + 3 [tex]\left[\begin{array}{cc}2&0\\2&1\\2&1\end{array}\right][/tex]
В ответ введите сумму элементов 2-го столбца матрицы С.
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