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Cyletix
小于 1 分钟
n
×
n
n \times n
n
×
n
方阵的行列式具有以下性质:
∣
A
∣
=
∣
A
T
∣
|A| = |A^T|
∣
A
∣
=
∣
A
T
∣
∣
A
B
∣
=
∣
A
∣
⋅
∣
B
∣
|AB| = |A| \cdot |B|
∣
A
B
∣
=
∣
A
∣
⋅
∣
B
∣
∣
A
B
∣
=
∣
B
A
∣
|AB| = |BA|
∣
A
B
∣
=
∣
B
A
∣
如果A可逆, 则
∣
A
∣
⋅
∣
A
−
1
∣
=
1
|A|\cdot|A^{-1}| = 1
∣
A
∣
⋅
∣
A
−
1
∣
=
1
如果A是上/下三角矩阵, 则
∣
A
∣
|A|
∣
A
∣
等于对角线上所有元素的乘积.
∣
A
∣
=
∏
i
=
1
n
a
i
i
|A|=\prod_{i=1}^n a_{ii}
∣
A
∣
=
i
=
1
∏
n
a
ii
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