概念問題 解答

${\displaystyle \left(\begin{array}{c}{x}^{\prime }\\ y^{\prime }\\ z^{\prime }\end{array}\right)=\left(\begin{array}{c}x\\ y\\ -z\end{array}\right)=\left(\begin{array}{c}1\cdot x+0\cdot y+0\cdot z\\ 0\cdot x+1\cdot y+0\cdot z\\ 0\cdot x+0\cdot y-1\cdot z\end{array}\right)}$ ${\displaystyle =\left(\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& -1\end{array}\right)\left(\begin{array}{c}x\\ y\\ z\end{array}\right)}$