已知矩阵A=12-14,向量a=74.(1)求矩阵A的特征值λ1、λ2和特征向量

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问题:

已知矩阵A=
12
-14
,向量
a
=
7
4

(1)求矩阵A的特征值λ1、λ2和特征向量
α1
α2

(2)求A5
α
的值.
考点:矩阵与变换
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下列离子反应方程式正确的是 (    )

A.铜粉与98.3%的硫酸加热下反应:Cu + 4H+ + SO42Cu2+ SO2↑+ 2H2O

B.电解饱和食盐水:2Cl +2H+H2↑+C12

C.向氯化铝溶液中加入过量氨水:Al3+ 4NH3·H2O=[Al(OH)4]+ 4NH4

D.硫酸亚铁溶液中加入用硫酸酸化的过氧化氢溶液:2Fe2++2H++H2O2=2Fe3++2H2O

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事物发展的源泉和动力是

A.意识

B.运动

C.联系

D.矛盾

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种子植物的两个基本特征是:①_______________;②_____________;种子植物可分为__________植物和___________植物,依据是种子外层是否有_____________包被。

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阅读理解。

     Just 25 years ago, the top three career hopes for young people in Britain were teacher, banker and

doctor. Now, they want to be sports star, pop star and actor, according to survey by the Guardian

newspaper.

     Rachel, a character in the popular TV show Glee, may be said to speak for British teenagers.

"Nowadays being nobody is worse than being poor." He said.

     Emma Brockes, a reporter with the Guardian, believes it is "the bad influence of celebrity(名人)

culture" that is to blame. "When children wanted to be doctor, it wasn't because they were really more

interested in the functions of human organs than they are now; you go where the respect is." She wrote.

     It could explain why there has been such an increase in levels of anxiety and depression. Dr Carlo

Stranger, of Tel Aviv University, studied the sense of self for his new book The Fear of Insignificance:

Searching for Meaning in the 21st Century. He told the Daily Mail that young people now are "affected

by the close connection to the global entertainment network, which has turned ranking and rating people

according to wealth and celebrity into an obsession(痴迷)."

     "As humans, we naturally measure ourselves to those around us, but now we live in a global village.

We are comparing ourselves with the most 'important' people in the world and finding ourselves wanting," he said. Today, even high achievers constantly fear that they are insignificant when they compare

themselves to success stories in the media.

      The way out? Simply stop measuring your achievement through a fantasy of wealth and celebrity.

Dr Strenger said that it is a process called "active self-acceptance through a constant search for

self-knowledge through life."

     "The fear of insignificance can only be overcome through strong individual and cultural identity over

and above measurable achievement," he said.

1. Nowadays, young people in Britain want to         .      

A.choose jobs based on interests

B.become famous        

C.be teacher, banker and doctor            

D.earn more money

2. According to Emma Brockes, what causes the increasing level of anxiety?

A.Choices of future careers.  

B.Access to the global network.

C.Bad influences of celebrities.

D.Endless comparison with others.

3. Which of the following is true of Dr Carlo Strenger?

A.He is a newspaper reporter

B.He is the spokesman of teenagers.

C.He tells success stories on TV.

D.He is against ranking people with wealth.

4. Dr Carlo Strenger suggests that young people should         .

A.seek active self-acceptance

B.stick to their own dreams

C.make great achievements

D.search for the secret of wealth

5. The text is mainly written to         .

A.talk about job choices

B.analyse a social phenomenon

C.encourage celebrity culture

D.introduce three famous people

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