设A为3×3矩阵,|A|=-2,把A按行分块为A=
(A1
A2
A3),
其中Aj(j=1,2,3)是A的第j行,则行列式
(A3-2A1
3A2
A1)=______
6 |A3-2A| | 3A2 | | A1 | = |A3 | |3A2| |A1 | + |-2A1| | 3A2| | A1 | = |A3 | |3A2| |A1 | =-3 |A1| |A2| |A3| =-3|A|=6.
设A为3×3矩阵,|A|=-2,把A按行分块为A=
(A1
A2
A3),
其中Aj(j=1,2,3)是A的第j行,则行列式
(A3-2A1
3A2
A1)=______
6 |A3-2A| | 3A2 | | A1 | = |A3 | |3A2| |A1 | + |-2A1| | 3A2| | A1 | = |A3 | |3A2| |A1 | =-3 |A1| |A2| |A3| =-3|A|=6.