（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
因为 是4x3矩阵，所以有三列，未知数的个数为3，同时告诉你，只有零解，所以秩=未知数的个数，即=3
多做几道
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