題目傳送門

一、步驟模擬

原方程組：
\( \left\{ \begin{array}{lc} a_{11}x_1 +a_{12}x_2+a_{13}x_3+......+a_{1n}x_n =b_1 \\ a_{21}x_1 +a_{22}x_2+a_{23}x_3+......+a_{2n}x_n =b_2 \\ a_{31}x_1 +a_{32}x_2+a_{33}x_3+......+a_{3n}x_n =b_3 \\ a_{41}x_1 +a_{42}x_2+a_{43}x_3+......+a_{4n}x_n =b_4 \\ a_{51}x_1 +a_{52}x_2+a_{53}x_3+......+a_{5n}x_n =b_5 \\ ... \\ a_{n1}x_1 +a_{n2}x_2+a_{n3}x_3+......+a_{nn}x_n =b_n \\ \end{array} \right. \)

\(\begin{table}[h] \centering \caption{} \label{} \begin{tabular}{c|c|c} \hline % or \cline{col1-col2} * & * & * \\ * & * & * \end{tabular} \end{table}\)