（填空题）%7D2JG_CV.png)
__________
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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正定矩阵
正定二次型对应的矩阵为正定矩阵
K~P7.png)
根据正定矩阵的判定标准，可以得t小于-2或t大于2
多做几道
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