（填空题）若一个4元线性方程组的系数矩阵秩为3，则基础解系中解向量的个数为__________
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
n-r=4-3=1
多做几道
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