（填空題）
__________
三階行列式
的值為__________
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）
???????
__________
題目
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齊次線性方程組的解
因?yàn)?是4x3矩陣，所以有三列，未知數(shù)的個(gè)數(shù)為3，同時(shí)告訴你，只有零解，所以秩=未知數(shù)的個(gè)數(shù)，即=3
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