수학1_행렬과 그래프_역행렬과 연립일차방정식_난이도 중

두 집합  \[\begin{array}{l}A = \left\{ {\left. {\left( {\begin{array}{ll}x\\y\end{array}} \right)\;} \right|\;\left( {\begin{array}{ll}a&1\\1&0\end{array}} \right)\left( {\begin{array}{ll}x\\y\end{array}} \right) = \left( {\begin{array}{ll}1\\1\end{array}} \right)} \right\}\\B = \left\{ {\left. {\left( {\begin{array}{ll}x\\y\end{array}} \right)\;} \right|\;\left( {\begin{array}{ll}a&1\\1&a\end{array}} \right)\left( {\begin{array}{ll}x\\y\end{array}} \right) = \left( {\begin{array}{ll}1\\{ - 1}\end{array}} \right)} \right\}\end{array}\]일 때, \(B \subset A\) 가 성립하도록 하는 모든 실수 \(a\) 의 값의 합은?

 

① \(-1\)           ② \(0\)          ③ \(1\)          ④ \(2\)          ⑤ \(3\)

 

 

 

정답 ⑤