（填空題）
???????__________
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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關(guān)于特征值和特征向量的若干結(jié)論
因為矩陣的特征值中有一個0，所以矩陣的行列式的值為0，解得未知數(shù)
多做幾道
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