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已知 $\boldsymbol{A}^2=\left(\begin{array}{rrr}2 & -1 & 0 \\ 7 & -3 & 0 \\ 0 & 0 & 9\end{array}\right), \boldsymbol{A}^3=\left(\begin{array}{rrr}-1 & 0 & 0 \\ 0 & -1 & 0 \\ 0 & 0 & -27\end{array}\right)$ ，求 $\boldsymbol{A}$ ．
                        
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