[7급 국가직 자동제어 2011년 20번]

1. ①$\dot{x}(t)=\left[\begin{array}{cc}0& 1\\ 5& 3\end{array}\right]x(t)+\left[\begin{array}{c}0\\ 1\end{array}\right]u(t),y(t)=\left[\begin{array}{cc}2& 1\end{array}\right]x(t)$
2. ②$\dot{x}(t)=\left[\begin{array}{cc}0& 1\\ -5& -3\end{array}\right]x(t)+\left[\begin{array}{c}0\\ 1\end{array}\right]u(t),y(t)=\left[\begin{array}{cc}2& 1\end{array}\right]x(t)$
3. ③$\dot{x}(t)=\left[\begin{array}{cc}0& 1\\ 5& 3\end{array}\right]x(t)+\left[\begin{array}{c}0\\ 1\end{array}\right]u(t),y(t)=\left[\begin{array}{cc}1& 2\end{array}\right]x(t)$
4. ④$\dot{x}(t)=\left[\begin{array}{cc}0& 1\\ -5& -3\end{array}\right]x(t)+\left[\begin{array}{c}0\\ 1\end{array}\right]u(t),y(t)=\left[\begin{array}{cc}1& 2\end{array}\right]x(t)$

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