设A为n阶对称矩阵，B为咒阶反对称矩阵，则下列矩阵中是反对称矩阵的是（）。
AB-BA
B. AB+BA
C. (AB)2
D. BAB
查看答案
They are talking about ().
A. how to prepare for a new branch office
B. how to build a new company
C. how to sign contracts
D. how to run business
What is the topic of this passage().
A. Insects that feed on plants.
B. Animals that feed on insects.
C. Plants that use insects to survive.
D. Insects that are attractive to plants.
How did they choose a lawyer().
A friend recommended a lawyer to them.
B. They will find a lawyer by themselves.
C. They will use an agency to find a lawyer.
D. They will send one of their HR people to hire a lawyer.
设A、B均为可逆矩阵，则必有（）。
A. (A+B)-1=A-1+B-1
B. (AB)-1=A-1B-1
C. (AB)*=A*B*
D. |(AB)*|=|A|n-1|B|n-1
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