（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
首先矩阵A是个四行五列的矩阵，所以转换成线性方程组后有五个未知数，同时已经有秩的数为2，所以所含向量的个数为3
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