2.若三阶行列式(begin{vmatrix}a_{11}&a_{12}&a_{13}a_{21}&a_{22}&a_{23}a_{31}&a_{32}&a_{33}end{vmatrix}=1)，则(begin{vmatrix}6a_{11}&3a_{12}&3a_{13}2a_{21}&a_{22}&a_{23}4a_{31}&2a_{32}&2a_{33}end{vmatrix}=)