（填空題）若一個(gè)4元線性方程組的系數(shù)矩陣秩為3，則基礎(chǔ)解系中解向量的個(gè)數(shù)為_(kāi)_________
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
n-r=4-3=1
多做幾道
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