題組內容

6. Give the following matrix A.

$$\mathbf{A} = \begin{bmatrix} 1 & 2 & 0 & 3 \\ 0 & 0 & 1 & 4 \\ 1 & 2 & 1 & 7 \end{bmatrix}$$

(2) Find the complete solution of \( \mathrm{Ax} = \begin{bmatrix} 1 \\ 2 \\ 3 \end{bmatrix} \). (10%)