【公众号】: 线性代数好助教

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【问题描述】:增广矩阵的横、纵线不显示

$\mathbf{A}=\left(\begin{array}{cc:c} 0 & 4 & 8\\ 6 & 2 & -4\\ \hdashline5 & 3 & 8 \end{array}\right)$

设$\mathbf{A}=\left(\begin{array}{c} \mathbf{A}_{11} & \mathbf{A}_{12}\\ \mathbf{A}_{21} & \mathbf{A}_{22} \end{array}\right)=\left(\begin{array}{cc|c} 1 & 1 & 2\\ 1 & 1 & 2\\ \hline 3 & 3 & 4 \end{array}\right)$

$\mathbf{B}=\left(\begin{array}{c} \mathbf{E}_{2}\\ \mathbf{0}_{1\times2}\end{array}\right)=\left(\begin{array}{cc|c} 1 & 0 \\ 0 & 1 \\\hline 0 &0\end{array}\right)$