[tex] \[
A=
\left( {\begin{array}{cc}
1 & -1 \\
-3 & 3 \\
\end{array} } \right)
\] \\ \\ 3A=? \\ \\ 3A= 3 \cdot
\left( {\begin{array}{cc}
1 & -1 \\
-3 & 3 \\
\end{array} } \right) =
\left( {\begin{array}{cc}
3\cdot (1) & 3\cdot (-1) \\
3\cdot (-3) & 3 \cdot (3) \\
\end{array} } \right) =
\left( {\begin{array}{cc}
3 & -3 \\
-9 & 9 \\
\end{array} } \right) \\ \\ \text{Asadar, matricea ceruta arata asa} \\ [/tex]
