（填空題）
__________
三階行列式
的值為_(kāi)_________
有方程組
只有唯一解，求A的取值范圍（ ? ?）
有四階行列式5THKX.png)
,求54QNWI.png)
的值__________
n階行列式
的值__________
（填空題）
???????
__________
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齊次線性方程組的解
基礎(chǔ)解系中向量的個(gè)數(shù)為n-r=未知數(shù)的個(gè)數(shù)減去秩，系數(shù)矩陣的秩通過(guò)初等行變換求解，可以求得秩為1，所以向量個(gè)數(shù)為2
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