（填空题）
__________
三阶行列式
的值为__________
有方程组
只有唯一解，求A的取值范围（ ）
有四阶行列式5THKX.png)
,求54QNWI.png)
的值__________
n阶行列式
的值__________
（填空题）
__________
题目
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齐次线性方程组的解
基础解系中向量的个数为n-r=未知数的个数减去秩，系数矩阵的秩通过初等行变换求解，可以求得秩为1，所以向量个数为2
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