题目内容

Passage One

A. It can’t make people feel good.
B. People can’t sleep well after the exercise.
C. It makes people feel good.
D. It helps people lose weight.

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设A是n阶矩阵,α1,α2,…,αn是n维列向量,其中αn≠0,若Aα1=α2,Aα2=α3,…,Aαn-1=αn,Aαn=0. 证明α1,α2,…,α3线性无关;

设A,B均为n阶方阵,且A为可逆矩阵,B为不可逆矩阵,A*,B*分别为A,B的伴随矩阵,则______.

A*+B*必为可逆矩阵
B. A*+B*必为不可逆矩阵
C. A*B*必为可逆矩阵
D. A*B*必为不可逆矩阵

设A是n阶矩阵,α1,α2,…,αn是n维列向量,其中αn≠0,若Aα1=α2,Aα2=α3,…,Aαn-1=αn,Aαn=0. 求A的特征值、特征向量.

Passage One

A. Walking. B. Running. C. Riding a bike. D. Wrestling.

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