一、题目
已知 $\boldsymbol{A}=\left[\begin{array}{lll}
a_{11} & a_{12} & a_{13} \\
a_{21} & a_{22} & a_{23} \\
a_{31} & a_{32} & a_{33}
\end{array}\right]$, $\boldsymbol{B}=\left[\begin{array}{ccc}
a_{21} & a_{22} & a_{23} \\
a_{11} & a_{12} & a_{13} \\
a_{31}+2 a_{11} & a_{32}+2 a_{12} & a_{33}+2 a_{13}
\end{array}\right]$, $\boldsymbol{P}_{1}=\left[\begin{array}{lll}
1 & 0 & 0 \\
0 & 1 & 0 \\
2 & 0 & 1
\end{array}\right]$, $\boldsymbol{P}_{2}=\left[\begin{array}{lll}
1 & 0 & 0 \\
0 & 1 & 0 \\
0 & 2 & 1
\end{array}\right]$, $\boldsymbol{P}_{3}=\left[\begin{array}{lll}
0 & 1 & 0 \\
1 & 0 & 0 \\
0 & 0 & 1
\end{array}\right]$, 则 如何使用 $\boldsymbol{A}$, $\boldsymbol{P_{1}}$, $\boldsymbol{P_{2}}$ 或 $\boldsymbol{P_{3}}$ 表示 $\boldsymbol{B}$ $?$
难度评级:
继续阅读“这个 plus 版“左行右列”类问题你还会做吗?”