题目内容

There are only two secrets to staying young, being happy and achieving success.

A. 对
B. 错

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Don't keep silent during the meeting. I want to hear your opinion

A. 对
B. 错

What is vour dream?

A. 对
B. 错

设三阶方阵A的特征值为1，2，3，则detA=______。

设三阶方阵A的特征值互不相同，若detA=0，则A的秩为()。

A. 0
B. 1
C. 2
D. 3