（填空題）%7D2JG_CV.png)
__________
三階行列式
的值為__________
有方程組
只有唯一解，求A的取值范圍（ ? ?）
有四階行列式5THKX.png)
,求54QNWI.png)
的值__________
n階行列式
的值__________
（填空題）
???????
__________
題目
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正定矩陣
正定二次型對應(yīng)的矩陣為正定矩陣
K~P7.png)
根據(jù)正定矩陣的判定標(biāo)準(zhǔn)，可以得t小于-2或t大于2
多做幾道
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