2017年電大《工程數(shù)學(xué)》廣播電視大學(xué)歷年期末試題及答案小抄參考.doc

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1、專業(yè)好文檔試卷代號(hào)：1080中央廣播電視大學(xué)20112012學(xué)年度第一學(xué)期“開(kāi)放本科”期末考試（半開(kāi)卷）工程數(shù)學(xué)(本) 試題2012年1月一、單項(xiàng)選擇題(每小題3分，共15分)1 設(shè)，為三階可逆矩陣，且，則下列（ ）成立A B C D 2 設(shè)是n階方陣，當(dāng)條件（ ）成立時(shí)，n元線性方程組有惟一解AE3設(shè)矩陣的特征值為0，2，則的特征值為（ ）。A0，2 B0，6C0，0 D2，64若隨機(jī)變量，則隨機(jī)變量 ( )5 對(duì)正態(tài)總體方差的檢驗(yàn)用( )二、填空題(每小題3分，共15分)6 設(shè)均為二階可逆矩陣，則 8 設(shè) A， B 為兩個(gè)事件，若,則稱A與B9若隨機(jī)變量，則 10若都是的無(wú)偏估計(jì)，且滿足_

2、，則稱比更有效。三、計(jì)算題(每小題16分，共64分)11 設(shè)矩陣，那么可逆嗎？若可逆，求逆矩陣12在線性方程組中取何值時(shí)，此方程組有解。在有解的情況下，求出通解。13. 設(shè)隨機(jī)變量,求和。 (已知，)14. 某切割機(jī)在正常工作時(shí)，切割的每段金屬棒長(zhǎng)服從正態(tài)分布，且其平均長(zhǎng)度為10.5cm，標(biāo)準(zhǔn)差為0.15cm。從一批產(chǎn)品中隨機(jī)地抽取4段進(jìn)行測(cè)量，測(cè)得的結(jié)果如下：（單位：cm）10.4, 10.6, 10.1, 10.4問(wèn)：該機(jī)工作是否正常（）？四、證明題（本題6分）15. 設(shè)n階矩陣A滿足,試證A為對(duì)稱矩陣。參考解答一、單項(xiàng)選擇題(每小題3分，共15分) 1、B 2、A 3、B 4、D 5、C

3、 二、填空題(每小題3分，共15分)三、計(jì)算題(每小題16分，共64分)試卷代號(hào)：1080中央廣播電視大學(xué)20102011學(xué)年度第二學(xué)期“開(kāi)放本科”期末考試（半開(kāi)卷）工程數(shù)學(xué)(本) 試題2011年7月一、單項(xiàng)選擇題(每小題3分，共15分)1 設(shè)，都是n階方陣，則等式（ ）成立A B C D2 已知2維向量組則至多是 AS（ ）。AE A、1 B、2 C、3 D、43線性方程組解的情況是（ ）。A無(wú)解 B有惟一非零解C只有零解 D有無(wú)窮多解4對(duì)任意兩個(gè)事件 A，B，等式( )成立A B C D5 設(shè)是來(lái)自正態(tài)總體的樣本，則 ( ) 是統(tǒng)計(jì)量A B C D二、填空題(每小題3分，共15分)1 設(shè)A

4、,B是3階方陣，其中則2 設(shè)A為n階方陣，若存在數(shù)和非零n維向量，使得，則稱為A的_。3 若，則 4設(shè)隨機(jī)變量，若,則 5若參數(shù)的兩個(gè)無(wú)偏估計(jì)量和滿足，則稱比更_三、計(jì)算題(每小題16分，共64分)1 設(shè)矩陣，,求2設(shè)齊次線性方程組，為何值時(shí)，方程組有非零解？在有非零解時(shí)求其通解。3. 設(shè),求(1)；（2）。4. 某鋼廠生產(chǎn)了一批管材，每根標(biāo)準(zhǔn)直徑100mm，今對(duì)這批管材進(jìn)行檢驗(yàn)，隨機(jī)取出9根測(cè)得直徑的平均值為99.9mm，樣本標(biāo)準(zhǔn)差s=0.47，已知管材直徑服從正態(tài)分布，問(wèn)這批管材的質(zhì)量是否合格？（檢驗(yàn)顯著性水平）四、證明題（本題6分）設(shè)A是可逆的對(duì)稱矩陣，試證：也是對(duì)稱矩陣。參考答案一、單

5、項(xiàng)選擇題(每小題3分，共15分) 1、C 2、B 3、A 4、D 5、B 二、填空題(每小題3分，共15分)1122特征值30.343 5. 有效三、計(jì)算題(每小題16分，共64分)四、證明題（本題6分）試卷代號(hào)：1080中央廣播電視大學(xué)20102011學(xué)年度第一學(xué)期“開(kāi)放本科”期末考試（半開(kāi)卷）工程數(shù)學(xué)(本) 試題2011年1月一、單項(xiàng)選擇題(每小題3分，共15分)1 設(shè)，都是n階方陣，則下列等式成立的是（ ）A B C D 2 方程組相容的充分必要條件是 AS（ ），其中AE3下列命題中不正確的是（ ）。A有相同的特征多項(xiàng)式 B若是 A 的特征值，則的非零解向量必是 A 對(duì)應(yīng)于的特征向量C

6、若是A的一個(gè)特征值，則AX=O 必有非零解 DA 的特征向量的線性組合仍為 A 的特征向量4若事件 A 與 B 互斥，則下列等式中正確的是( )5 設(shè)是來(lái)自正態(tài)總體的樣本，則檢驗(yàn)假設(shè)采用統(tǒng)計(jì)量 ( )二、填空題(每小題3分，共15分)6 設(shè)，則的根是7設(shè)4 元錢(qián)性方程提 AX=B 有解且，那么的相應(yīng)齊次方程程的基礎(chǔ)解系含有_個(gè)解向量。8 設(shè) A， B 互不相容，且 P(A)O ，則 9設(shè)隨機(jī)變量，則 10若樣本來(lái)自總體，且，則_三、計(jì)算題(每小題16分，共64分)11 設(shè)矩陣，求12求下列線性方程組的通解。13. 設(shè)隨機(jī)變量,試求(1)；（2）使成立的常數(shù)。 (已知，)14. 從正態(tài)總體中抽取

7、容量為625的樣本，計(jì)算樣本均值得，求的置信區(qū)間度為，99%的置信區(qū)間。（已知）四、證明題（本題6分）15. 設(shè)n階矩陣A滿足,則A為可逆矩陣。參考解答一、單項(xiàng)選擇題(每小題3分，共15分) 1、A 2、B 3、D 4、A 5、C 二、填空題(每小題3分，共15分)11,-1,2.,-223304np 5.三、計(jì)算題(每小題16分，共64分)試卷代號(hào)：1080中央廣播電視大學(xué)20092010學(xué)年度第二學(xué)期“開(kāi)放本科”期末考試（半開(kāi)卷）工程數(shù)學(xué)(本) 試題2010年7月一、單項(xiàng)選擇題(每小題3分，共15分)1 設(shè)，B都是n階方陣，則下列命題正確的是（ ）A B C D 2 向量組的秩是 AS（

8、）AEA1 B3C 2 D43 n元線性方程組，有解的充分必要條件是（ ）。A BA不是行滿秩矩陣C D4 袋中有3個(gè)紅球，2個(gè)白球，第一次取出一球后放回，第二次再取一球，則兩球都是紅球的概率是 ( )A B C D 5 設(shè)是來(lái)自正態(tài)總體的樣本，則 ( )是無(wú)偏估計(jì)A BC D二、填空題(每小題3分，共15分)1 設(shè)均為3階方陣，且2設(shè)為階方陣，若存在數(shù)和非零維向量，使得_，則稱為的特征值3設(shè)隨機(jī)變量，則4設(shè)為隨機(jī)變量，已知，此時(shí) 5設(shè)是未知參數(shù)的一個(gè)無(wú)偏估計(jì)量，則有_三、計(jì)算題(每小題16分，共64分)1 設(shè)矩陣，且有，求2求線性方程組的全部解。3. 設(shè),試求（1）；（2）。 (已知，)4.

9、 據(jù)資料分析，某廠生產(chǎn)的一批磚，其抗斷強(qiáng)度，今從這批磚中隨機(jī)地抽取了9塊，測(cè)得抗斷強(qiáng)度（單位：）的平均值為31.12，問(wèn)這批磚的抗斷強(qiáng)度是否合格？四、證明題（本題6分） 設(shè)是n階對(duì)稱矩陣，試證：也是對(duì)稱矩陣。參考解答一、單項(xiàng)選擇題(每小題3分，共15分) 1、A 2、B 3、A 4、D 5、C 二、填空題(每小題3分，共15分)1-18230.3427 5.三、計(jì)算題(每小題16分，共64分)1解：利用初等行變換得2解：將方程組的增廣矩陣化為階梯形試卷代號(hào)：1080中央廣播電視大學(xué)20092010學(xué)年度第一學(xué)期“開(kāi)放本科”期末考試（半開(kāi)卷）工程數(shù)學(xué)(本) 試題2010年1月一、單項(xiàng)選擇題(每小

10、題3分，共15分)1 設(shè)為對(duì)稱矩陣，則條件（ ）成立A B C D 2 AS（ ）AEA BC D3 若 ( )成立，則元方程組有唯一解。A BC D的行向量組線性無(wú)關(guān)4 若條件 ( )成立，則隨機(jī)事件互為對(duì)立事件A B C D 5 對(duì)來(lái)自正態(tài)總體的一組樣本，記，則下列各式中 ( )不是統(tǒng)計(jì)量ABCD二、填空題(每小題3分，共15分)6 設(shè)均為3階方陣，且7設(shè)為階方陣，若存在數(shù)和非零維向量，使得_，則稱為相應(yīng)于特征值的特征向量8若，則9如果隨機(jī)變量的期望且，那么 10不含未知參數(shù)的樣本函數(shù)稱為_(kāi)三、計(jì)算題(每小題16分，共32分)11 設(shè)矩陣，求12當(dāng)取何值時(shí)，線性方程組有解，在有解的情況下求

11、出此方程組的一般解四、計(jì)算分析題（每小題16分，共32分）13. 設(shè),試求（1）；（2）。 (已知，)14. 某車(chē)間生產(chǎn)滾珠，已知滾珠直徑服從正態(tài)分布，今從一批產(chǎn)品里隨機(jī)取出9 個(gè)，測(cè)得直徑平均值為15.1 mm，若已知這批滾珠直徑的方差為，試找出滾珠直徑均值的置信度為0.95的置信區(qū)間五、證明題（本題6分）15. 設(shè)隨機(jī)事件相互獨(dú)立，試證：也相互獨(dú)立。參考解答一、單項(xiàng)選擇題(每小題3分，共15分) 1、B 2、D 3、A 4、C 5、C 二、填空題(每小題3分，共15分)68780.3920 10統(tǒng)計(jì)量三、計(jì)算題(每小題16分，共64分)11解：利用初等行變換得12解：將方程組的增廣矩陣化為

12、階梯形四、計(jì)算分析題（每小題16分，共32分）If we dont do that it will go on and go on. We have to stop it; we need the courage to do it.His comments came hours after Fifa vice-president Jeffrey Webb - also in London for the FAs celebrations - said he wanted to meet Ivory Coast international Toure to discuss his complai

13、nt.CSKA general director Roman Babaev says the matter has been exaggerated by the Ivorian and the British media.Blatter, 77, said: It has been decided by the Fifa congress that it is a nonsense for racism to be dealt with with fines. You can always find money from somebody to pay them.It is a nonsen

14、se to have matches played without spectators because it is against the spirit of football and against the visiting team. It is all nonsense.We can do something better to fight racism and discrimination.This is one of the villains we have today in our game. But it is only with harsh sanctions that ra

15、cism and discrimination can be washed out of football.The (lack of) air up there Watch mCayman Islands-based Webb, the head of Fifas anti-racism taskforce, is in London for the Football Associations 150th anniversary celebrations and will attend Citys Premier League match at Chelsea on Sunday.I am g

16、oing to be at the match tomorrow and I have asked to meet Yaya Toure, he told BBC Sport.For me its about how he felt and I would like to speak to him first to find out what his experience was.Uefa hasopened disciplinary proceedings against CSKAfor the racist behaviour of their fans duringCitys 2-1 w

17、in.Michel Platini, president of European footballs governing body, has also ordered an immediate investigation into the referees actions.CSKA said they were surprised and disappointed by Toures complaint. In a statement the Russian side added: We found no racist insults from fans of CSKA.Baumgartner

18、 the disappointing news: Mission aborted.The supersonic descent could happen as early as Sunda.The weather plays an important role in this mission. Starting at the ground, conditions have to be very calm - winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon,

19、 with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our day-to-day weather lives. It will climb higher than the tip of Mount Everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 ki

20、lometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence.The balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform.Below

21、, the Earth becomes the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, hell be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end.Skydiver preps for the big jumpWhen

22、 he jumps, he is expected to reach the speed of sound - 690 mph (1,110 kph) - in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him completely.If he goes too fast or spins out of

23、control, he has a stabilization parachute that can be deployed to slow him down. His team hopes its not needed. Instead, he plans to deploy his 270-square-foot (25-square-meter) main chute at an altitude of around 5,000 feet (1,524 meters).In order to deploy this chute successfully, he will have to

24、slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds.Even if everything goes as planned, it wont. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters).cause there第 23 頁(yè) 共 23 頁(yè)