题目内容

已知三阶矩阵A的特征值是0,-2, 2,则下列结论不正确的是()

A. 矩阵A不可逆
B. 矩阵A的主对角线上元素之和是0
C. 特征值2与-2的特征向量是正交的
D. Ax=0的基础解系由一个向量组成

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