二、線性代數部分：
1. Find the matrix A whose eigenvalues are 4 and 1 and whose eigenvectors are \( \begin{bmatrix} 2 \\ 1 \end{bmatrix} \)and\( \begin{bmatrix} 3 \\ 1 \end{bmatrix} \), respectively.(10%)
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二、線性代數部分：
1. Find the matrix A whose eigenvalues are 4 and 1 and whose eigenvectors are \( \begin{bmatrix} 2 \\ 1 \end{bmatrix} \)and\( \begin{bmatrix} 3 \\ 1 \end{bmatrix} \), respectively.(10%)