（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
首先矩陣A是個(gè)四行五列的矩陣，所以轉(zhuǎn)換成線性方程組后有五個(gè)未知數(shù)，同時(shí)已經(jīng)有秩的數(shù)為2，所以所含向量的個(gè)數(shù)為3
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