9.|}a_(11)&a_(12)&a_(13)a_(21)&a_(22)&a_(23)a_(31)&a_(32)&a_(33)|=3.|}-3a_(21)&-3a_(22)&-3a_(23)a_(11)&a_(12)&a_(13)a_(31)+2a_(11)&a_(32)+2a_(12)&a_(33)+2a_(13)|=第1空

9.(填空题，4.0分) $|\begin{matrix}a_{11}&a_{12}&a_{13}\\a_{21}&a_{22}&a_{23}\\a_{31}&a_{32}&a_{33}\end{matrix}|=3.$ $|\begin{matrix}-3a_{21}&-3a_{22}&-3a_{23}\\a_{11}&a_{12}&a_{13}\\a_{31}+2a_{11}&a_{32}+2a_{12}&a_{33}+2a_{13}\end{matrix}|=$ 第1空

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