矩阵可以行列同时变换吗,矩阵的行列变换法则

俊秀的月饼begin{array}{lc}俊秀的月饼mbox{}&俊秀的月饼begin{array}{cc}r&m-r 俊秀的月饼end{array}俊秀的月饼俊秀的月饼俊秀的月饼begin{array}{c}l俊秀的月饼俊秀的月饼n-l俊秀的月饼end{array}&俊秀的月饼left[俊秀的月饼begin{array}{cc}P&0俊秀的月饼俊秀的月饼0&Q俊秀的月饼end{array}俊秀的月饼right]俊秀的月饼end{array}