已知λ1=6,λ2=λ3=3是实对称矩阵A的三个特征值,且对应于λ2=λ3=3的特征

题型:问答题

问题:

已知λ1=6,λ23=3是实对称矩阵A的三个特征值,且对应于λ23=3的特征向量为α2=(-1,0,1)T,α3=(1,-2,1)T,求A对应于λ1=6的特征向量及矩阵A.

考点:普通考研考研数学(三)考研数学三
题型:问答题

I was now five, and still I showed no much interest in things except with my toes(脚趾). I could not look after myself,   35  my father took care of me. I used to lie on my back all the time in the kitchen. I was   36 , imprisoned(监禁) in a world of my own, unable to communicate with others.
Then, suddenly, it happened on the afternoon of a cold December day. All the family were gathered round the big kitchen fire. Mona and Paddy were drawing funny animals, using a bright piece of yellow chalk. It was the chalk that   37  me so much. I had never seen anything like it before.
Suddenly, I wanted to do what my sister was doing. Then without thinking or knowing exactly what I was doing, I   38  out and took the chalk out of my sister’s hand, with my left foot. It is a puzzle(迷惑)to many people as well as to   39 . I held the chalk tightly between my toes and made a wild scribble(乱涂)with it on the board. Next moment I stopped, not knowing what to do with the chalk next, hardly knowing how it   40  there. Then I looked up and realized that everyone was looking at me   41 . My mother came in. Her eyes looked from my face down to my   42 , then she took another piece of chalk from Mona, and drew the single letter “A” on the floor in front of me. “Copy that, Christy.” She said. I tried to do the same action, but I   43 . “Try again, Chris.” she whispered in my ear. I tried another two more times. I drew one side of the letter, then the other. It looked ugly, but I   44  to make it finally. I had done it! True! I couldn’t speak with my mouth, but now I would speak through something more   45  than spoken words. That one letter was my   46  to a new world, my key to mental freedom.
小题1:
A.andB.forC.soD.though
小题2:
A.lostB.lonelyC.tiredD.weak
小题3:
A.troubledB.worriedC.remindedD.interested
小题4:
A.dropped B.setC.checkedD.reached
小题5:
A.youB.meC.itD.them
小题6:
A.gotB.stuckC.workedD.arrived
小题7:
A.angrily B.sadlyC.silentlyD.carefully
小题8:
A.handB.neckC.footD.leg
小题9:
A.frozeB.forgotC.fellD.failed
小题10:
A.triedB.managedC.offeredD.decided
小题11:
A.lastingB.interestingC.movingD.surprising
小题12:
A.dreamB.tool C.gift D.road
题型:问答题

外感咳嗽的特点

A.多为新病

B.起病急

C.病程短

D.常伴肺卫表证

E.反复发作

题型:问答题

螺旋CT扫描又可称为()

A.动态扫描

B.快速扫描

C.容积扫描

D.同层扫描

E.定位扫描

题型:问答题

隐性采访应当遵循以下哪些原则?()

A.公共利益原则 

B.别无他法原则 

C.场合的公共性原则 

D.减少道德损失原则

题型:问答题

马克思主义哲学产生之前,唯心史观长期占有统治地位是因为唯物史观与唯心史观斗争不力。()

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