有方程组
只有唯一解，求A的取值范围（ ）
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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克拉默法则
若n元n次方程组只有唯一解，则系数行列式的值不为0
解得A不等于-1
多做几道
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