题目内容

设A是二阶矩阵，α为非零向量，但不是A的特征向量，且满足A2α+Aα-2α=0．证明： (Ⅰ)α，Aα线性无关； (Ⅱ)A可对角化．

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·You will hear part of a conversation between an interviewer and Andrew Grove, the chairman, CEO and co-founder of Intel.·For each question 23 30, mark one letter A, B or C for the correct answer.·You will hear the recording twice. Before Andrew Grove arrived in the U.S. in 1956, where did he live

A. Hungary
Britain
C. Portugal

Questions 11 to 18 are based on the conversation you have just heard.

At a restaurant.
B. At a grocery.
C. At a department store.
D. At a hardware store.

扶正与祛邪的关系如何

继发性病因，主要有和。