$M=\left[\begin{array}{rrr}2 & 1 & 1 \\ -1 & 2 & 0 \\ 3 & 0 & 1\end{array}\right], X=\left[\begin{array}{l}x \\ y \\ z\end{array}\right]$

$A=\left[\begin{array}{rrr}1 & 2 & 1 \\ 0 & 1 & -1 \\ 3 & -1 & 1\end{array}\right], \Delta=\left[\begin{array}{ccc}x-1 & 2 & 3 \\ 1 & x-1 & 1 \\ 3 & 2 & x-1\end{array}\right]$

$A=\left[\begin{array}{rrr} 2 & -1 & -1 \\ -1 & 0 & 2 \\ -2 & 1 & -1 \end{array}\right], X=\left[\begin{array}{l} x \\ y \\ z \end{array}\right], B=\left[\begin{array}{r} 0 \\ 1 \\ -2 \end{array}\right], D=\left[\begin{array}{rrr} 1 & 4 & -1 \\ 0 & -1 & -1 \\ 3 & 2 & 1 \end{array}\right]$

$\begin{array}{l}\text {} A=\left[\begin{array}{ll}5 & 2 \\ 2 & 1\end{array}\right], B=\left[\begin{array}{rr}3 & -2 \\ -4 & 3\end{array}\right], C=\left[\begin{array}{lll}1 & 3 & 2 \\ 2 & 1 & 3 \\ 3 & 2 & 1\end{array}\right], X=\left[\begin{array}{l}x \\ y \\ z\end{array}\right] \\ \text { এবং } R=\left[\begin{array}{l}5 \\ 1 \\ 4\end{array}\right]\end{array}$