2016年七宝高三三模(理)(第一次)
上海市七宝中学2016届高三考前模拟英语试题(一) Word版含答案
2016高三英语模拟考试II. Grammar and VocabularySection ADirections:After reading the passages below, fill in the blanks to make the passages coherent and grammatically correct. For the blanks with a given word, fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.(A)Once just a science fiction idea, VR has now become more accessible than ever. (25) _________ (wear) a pair of VR goggles connected to your computer and you can experience a lot of things without stepping out of the room. From climbing (26) _________ (high) mountain in the world to flying a spacecraft, the things you can experience with VR are limitless.This new 'reality ' is starting to takeover China. The Report on Chinese VR Users' Behavior was released on March 18 during the 12th TFC Global Mobile Game Conference & Intelligent Entertainment Expo held in Beijing. The report is based on a survey of 5,626 people, (27) _________ (age) between 15 and 39, from across the country. It shows that up to 68.5 percent of people have heard of or are interested in VR products.But surprisingly, it isn't new technology that has made VR so popular. 'VR has been (28) _________ for many years, but it will stick this time because there's enough computer power and the price will just keep going down,' Todd Richmond, a VR group member with the Institute of Electrical and Electronic Engineers in the US, told USA Today.VR (29) _________ (expect) to change various different fields. For example, VR could be used to train pilots and miners before they had to actually risk their lives in highly dangerous working environments, or to treat patients with acrophobia(恐高症)by making them think they were standing on top of a high building.'If you have perfect virtual reality, (30) _________ you'll be able to simulate everything that a human can experience or imagine experiencing,it's hard to imagine where you go from there,' Palmer Luckey, 23 inventor of the Oculus VR goggles, told NPR.But the technology is still far from perfect. Users report experiencing motion sickness, headaches and other discomfort while wearing VR goggles. Also, (31) _________ more and more tools are flooding the market, the software that runs VR games and simulators has yet to catch up with all the new advancements. It could take (32) _________ while for VR to be widely accepted.When every new technology is first introduced, the technology (33) _________ is the driving force. But for it to really blend into people's lives, meeting basic and practical needs should be the main aim.(B)It has become the talk of the town: A stranger allegedly attacked a woman in a Beijing hotel at night on April 3. The man is said to have clutched her by the neck and attempted to drag her into the elevator. Lodgers passed by, but no one tried to intervene until one woman did. Her actions are believed to (34) _________ (save) the victim from whatever was going to happen to her.The incident has pushed the risks of solo traveling into the spotlight. Online forums like Sina Weibo (35) _________ (flood) with advice for how women (36) _________ protect themselveswhen they find themselves alone.This case reminded many of the murder of Sarai Sierra, a 33-year-old New York woman. A homeless man killed her while she was traveling alone in Turkey in 2013. After the tragedy ,some netizens blamed Sierra for her own murder. One comment (37) _________ (read), 'A single woman traveling alone is risky . In a foreign country, it is downright foolish', another commenter wrote,'A woman has no business traveling alone.'Though gender does play into the rates and kinds of attacks a traveler might be subject to women and men need to be equally wary of potential risks. Last summer, a 19 -year-old American man allegedly found himself (38) _________ (lock) inside his Airbnb rental in Madrid, Spain. That's when his host tried to sexually assault him, the teen said.(39) _________ gender you are, it's always important to stay alert and never take any chances. Luo Chenyu, 22, is a senior student at Y unnan University. She went to Thailand last year on a campus exchange program. One night, she said she and a friend were walking on the street in Bangkok when they had the feeling a man was tailing them. They picked up their pace and walked into a nearby grocery store. Just as they expected, the man followed them into the store and lingered for a few moments but eventually left without buying anything.Luo and her friend felt lucky that the situation did not escalate. She also said her self-defense training helped her feel more prepared. 'I do a little karate. (40) _________ I'm not skilled enough to defeat the attacker, I might still earn some time so I could get away,' she said.Section BDirections: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need.Although Henry Ford's name is closely associated with the concept of mass production, he should receive equal (41) __________ for introducing labor practices as early as 1913 that would be considered advanced even by today's (42) __________ . Safety measures were improved, and the work day was reduced to eight hours, compared with the ten-or twelve-hour day common at the time. In order to (43) __________ the shorter work day, the entire factory was converted from two to three (44) __________ .In addition,sick (45) __________ as well as improved medical care for those injured on the job were instituted. The Ford Motor Company was one of the first factories to develop a technical school to train specialized skilled laborers and an English language school for immigrants. Some efforts were even made to hire the handicapped and provide jobs for former convicts.The most widely acclaimed innovation was the five-dollar-a-day minimum wage that was offered in order to recruit and retain the best mechanics and to (46) __________ the growth of labor unions. Ford explained the new wage policy in terms of efficiency and profit sharing. He also mentioned the fact that his employees would be able to purchase the automobiles that they produced - in effect creating a market for the product. In order to qualify for the minimum wage , an employee had to establish a decent home and (47) __________ good personal habits , including sobriety , thriftiness, (48) __________ , and dependability.Although some (49) __________ was directed at Ford for involving himself too much in the personal lives of his employees,there can be no doubt that, at a time when immigrants were being taken advantage of in frightful ways, Henry Ford was helping many people to (50) __________ themselves in America.III. Reading ComprehensionSection ADirections: For each blank in the following passage there are four words or phrases marked A, B, C and D. Fill in each blank with the word or phrase that best fits the context.President Obama's second Inaugural Address used soaring language to stress America's commitment to the dream of equality of opportunity: ‘We are true to our belief that a little girl born into (51) __________ knows that she has the same chance to succeed as anybody else, because she is an American.'The gap between ideal and reality could hardly be (52) __________. Today, the United States has less equality of opportunity than almost any other advanced industrial country. Study after study has (53) __________ the myth that America is a land of opportunity. A way of looking at equality of opportunity is to ask to what extent the life chances of a child are (54) __________ the education and income of his parents. Is it just as likely that a child of poor or poorly educated parents gets a good education and rises to the middle class as someone born to middle-class parents with college degrees? Even in a more democratic society, the answer would be no.How do we explain this? Some of it has to do with persistent discrimination. Latinos and African-Americans still get paid less than whites, and women still get paid less than men, (55) __________ they recently surpassed men in the number of advanced degrees they obtain. Discrimination, however, is only a small part of the (56) __________. Probably the most important reason for (57) __________ of equality of opportunity is education. After World War II, we made a major effort to (58) __________ higher education to Americans across the country. But then we changed, in several ways. While racial segregation decreased, economic segregation increased. After 1980, the poor grew poorer, the middle stagnated(停滞不前), and the top did better and better. A result was a widening gap in educational performance - the (59) __________ gap between rich and poor kids born in 2001 was 30 to 40 percent larger than it was for those born 25 years earlier, a Stanford sociologist found. Of course, there are other forces (60) __________. Children in rich families get more exposure to reading.Children in rich families get more exposure to reading. Their families can afford enriching experiences like music lessons and summer camp. They get better nutrition and health care, which enhance their learning, directly and indirectly.Now Americans are coming to realize that without substantial policy changes, their long cherished belief is only a myth. It is unreasonable that a rich country like the United States has made(61) __________ to higher education so difficult for those at the bottom and middle. There are many(62) __________ ways of providing chances for more to receive higher education, from Australia's income-contingent loan program to the near-free system of universities in Europe. A more educated population yields greater innovation, and a robust economy. Those benefits are why we've long been (63) __________ to fee public education through 12th grade. But while a 12th-grade education mighthave been enough a century ago, it isn't today. Yet we haven't (64) __________ our system to contemporary realities.The steps I've outlined are not just affordable but necessary. Even more important, though, isthat we cannot afford to let our country drift farther from (65) __________ that the vast majority of Americans share. We will never fully succeed in achieving Mr. Obama's vision of a poor girl'shaving exactly the same opportunities as a wealthy girl. But we could do much, much better, andmust not rest until we do.51. A. prejudice B. inferior C. poverty D. minority52. A. narrower B. wider C. severer D. closer53. A. conducted B. concluded C. excluded D. exposed54. A. distinct from B. feasible by C. superior to D. dependent on55. A. even though B. as though C. only if D. as if56. A. photograph B. picture C. atmosphere D. condition57. A. lack B. leak C. explosion D. extinction58. A. exhibit B. explore C. extend D. exploit59. A. scholarship B. satisfaction C. achievement D. ambition60. A. at play B. under control C. in use D. on show61. A. devotion B. familiarity C. application D. access62. A. imaginative B. alternative C. initiative D. productive63. A. admitted B. addicted C. committed D. restricted64. A. abandoned B. adjusted C. altered D. applied65. A. memories B. glory C. reality D. idealsSection BDirections: Read the following passages. Each passage is followed by several questions orunfinished statements. For each of them there are four choices marked A, B, C and D. Choose theone that fits best according to the information given in the passage you have just read.(A)WOMEN have been driving yellow cabs in New York since the 1940s, but 99% of drivers aremale. Even among drivers of cars booked by phone or online, only 4% are women. That may changewith the launch of SheTaxis, an app that lets female passengers insist on female drivers, and viceversa.It will be available in New York City (where it will be called 'SheRides'), Westchester and Long Island, and the firm plans to expand to other cities. Stella Mateo, the founder, is betting that quite a few women are nervous and weary of getting into cars driven by men. The service may also appeal to those whose religious beliefs forbid them to travel with unrelated men. Each driver wears a pink pashmina. Men who ask for a ride will be directed to another car service.Similar services thrive in India, South Africa and several Middle Eastern cities. Some Brazilian and Mexican cities offer women-only public-transport programmes known as 'pink transport'. Japan has had women-only railway carriages on and off since 1912. Known as hana densha (flower trains), they offer a haven from the gropers who make rush hour in Tokyo so disagreeable. Women-only hotel floors are popular, too.But SheTaxis faces two speed bumps. One is practical. Demand has been so great that the firm has had to decelerate its launch until it can recruit 500 drivers. The other obstacle is legal. By employing only female drivers, SheTaxis is obviously discriminating against men. Since anti-discrimination law is not always applied with common sense, that may be illegal. And there is no shortage of potential litigants. Yellow cabbies are furious at the growth of online taxi firms such as Uber. 'It's not hard to imagine a guy...filing suit,' says Sylvia Law of New York University Law School. SheTaxi's defence would probably be that its drivers are all independent contractors.Because the firm caters only to women, it is discriminating against male customers, too. Is that legal? Angela Cornell of Cornell Law School thinks there could be a loophole. New York's Human Rights Commission could make an exemption on the ground that SheTaxi offers a service that is in the public interest: women feel safer not getting into cars with strange men. Women-only colleges are allowed, so why not women-only cabs? The snag is that some men may also feel safer getting into cabs with female drivers. A study in 2010 found that 80% of crashes in New York City that kill or seriously injure pedestrians involve male drivers. Women drivers are simply better.66. It can be inferred that the service of SheTaxis may appeal to__________.A.women who are nervous about taxi driversB.women with certain religious beliefsC.women who are tired of taking taxisD.men who ask for a ride67. The word 'gropers' (para.3) probably refers to__________.A. people who cause a traffic jamB. men who make sexual harassment to womenC. men who cause the rush hour in TokyoD. people who make taking trains disagreeable68. If She Taxis is accused of discriminating against men, it may __________.A. decelerate its launch as an online taxi firmB.employ both male and female driversC.make anti-discrimination law not applicableD.spring to the defence of its drivers69. SheTaxi may be exempt (被豁免的) from illegality by New York's Human Rights Commission because __________.A.its service provided is based on the public interestB.it discriminates against male passengersC.it provides service also for male passengersD.it decreases crashes cause scrashes caused by male drivers(B)It was 3:45 in the morning when the vote was finally taken. After six months of arguing and final 16 hours of hot parliamentary debates, Australia's Northern Territory became the first legal authority in the world to allow doctors to take the lives of incurably ill patients who wish to die. The measure passed by the convincing vote of 15 to 10. Almost immediately word flashed on the Internet and was picked up, half a world away, by John Hofsess, executive director of the Right to Die Society of Canada. He sent it on by way of the group's online service, Death NET. Says Hofsess: 'We posted bulletins all day long, because of course this isn't just something that happened in Australia. It's world history.'The full import may take a while to sink in. The NT Rights of the Terminally Ill Law has left physicians and citizens alike trying to deal with its moral and practical implications. Some have breathed sighs of relief, others, including churches, right-to-life groups and the Australian Medical Association, bitterly attacked the bill and the hurry of its passage.But the tide is unlikely to turn back.In Australia—where an aging population, life-extending technology and changing community attitudes have all played their part—other states are going to consider making a similar law to deal with euthanasia. In the US and Canada, where the right-to-die movement is gathering strength, observers are waiting for the dominoes to start falling.Under the new Northern Territory law, an adult patient can request death —probably by a deadly injection or pill —to put an end to suffering. The patient must be diagnosed (诊断) as Terminally Ill by two doctors. After a 'cooling off' period of seven days, the patient can sign a certificate of request. After 48 hours the wish for death can be met. For Lloyd Nickson, a 54-year-old Darwin resident suffering from lung cancer, the NT Rights of Terminally Ill Law means he can get on with living without the haunting fear of his suffering: a terrifying death from his breathing condition. 'I'm not afraid of dying from a spiritual point of view, but what I was afraid of was how I'd go, because I've watched people die in the hospital fighting for oxygen and clawing at their masks,' he says.70. From the second paragraph we learn that __________.A. the objection to euthanasia is slow to come in other countriesB. physicians and citizens share the same view on euthanasiaC. changing technology is chiefly responsible for the hurry passage of the lawD. it takes time to realize the significance of the law's passage71.When the author says that observers are waiting for the dominoes to start falling, he means __________.A. observers are taking a wait-and see attitude towards the future of euthanasiaB. similar bills are likely to be passed in the US,Canad and other countriesC. observer are waiting to see the result of the game of dominoesD. the effect-taking process of the passed bill may finally come to a stop72. When Lloyd Nickson dies,he will __________.A. face his death with calm characteristic of euthanasiaB. experience the suffering of a lung cancer patientC. have an intense fear of terrible sufferingD. undergo a cooling off period of seven days73. The author's attitude towards euthanasia seems to be that of __________.A.oppositionB.suspicionC.approvalD.indifference(C)Over the weekend, NASA’s newest Mars rover, the Curiosity, which landed early on Aug. 6 after an eight-month flight, started sending back a 360-degree high-resolution panorama of its surroundings.At a news conference on Wednesday, John P. Grotzinger, a professor of geology at the Califor- nia Institute of Technology who serves as the mission’s project scientist, compared the view with a place just a few hours’ drive from Pasadena, Calif, and NASA’s Jet Propulsion Laboratory, the rover’s birthplace. “You would really be forgiven for thinking that NASA was trying to pull a fast one on you,” he said, “and we actually put a rover out in the Mojave Desert and took a picture—a little L.A.(Los Angeles) smog coming in there.” He added, “To a certain extent, the first impression you get is how Earth-like it seems.”Where the Curiosity actually sits is a 96-mile-wide crater named Gale near the Martian equator. To the north, the images show part of the crater rim that is believed to have been eroded by flowing water. To the south is a 3.4-mile-high peak that the scientists call Mount Sharp, which Curiosity is meant to reach and to climb. By investigating the layers of sedimentary rock on Mount Sharp,mission scientists hope to reconstruct the climate and environment of early Mars and tell whether it could have been once been habitable for life.The photos also show marks that Curiosity has made at the landing site. As Curiosity was lowered to the surface of Mars, blasts from the descent-stage engines created indentations in the nearby soil, exposing the bedrock below. This exposed bedrock is likely to be one of the first areas of scientific exploration on the rover’s planned two-year journey.After the flawless landing, the first week of operations of the rover on the ground also proceeded almost perfectly, too, as engineers started checking out the rover’s system, deployed the high-gain antenna, and raised the mast that holds the cameras.So far, no significant trouble has arisen. The weather instrument experienced a problem that engineers figured out a day later. The rover’s internal temperatures are slightly warmer than expected, possibly because the crater is warmer than predicted or because NASA’s computer models of Curiosity were not quite right. Worries about overheating could put constraints on when certain instruments can be used. But the heat is also a boon, reducing the energy Curiosity needs to warm up its joints and wheels before moving.74. Where is the rover Curiosity’s real location?A. In the middle Mojave Desert near its birthplace in the US.B. To the south of crater Gale that is near the Martian equator.C. Near the Martian equator which is eroded by flowing water.D. On top of a 3.4-mile-high peak which used to be habitable.75. It can be inferred from the passage that the rover’s investigation *.A. is likely to start with the study of the rocks on MarsB. is determined on the reconstruction of the climate on MarsC. started immediately after the rover’s perfect landingD. can only begin a fter a week’s preparation on the ground76. What caused the rover’s unexpected warmer internal temperature?A. A minor problem of the weather instrument.B. Problems of NASA’s computer models of Curiosity.C. The impact on the rover during landing.D. Overheating of certain instrument in the rover.77. What is the main idea of the passage?A. How earthlike the surface of Mars is.B. The success landing of Curiosity.C. NASA’s achievement in investigating Mars.D. How far the mission of Curiosity has gone.Section CDirections: Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words.Outdoor air pollution leads to more than 3 million premature deaths each year, and more than two thirds of them occur in China and India, according to new research. The authors estimate that without government intervention, the total number of deaths could double by 2050.The study, published in the journal Nature, identifies particulate matter(悬浮粒) as the prime pollutant leading to premature mortality. Particulate matter, a substance formed as a combination of different materials released into the air, is thought to be harmful to human health once it exceeds 2.5 micrometers in diameter. Researchers also identified ozone as a contributor to dangerous air quality.The causes of air pollution vary dramatically from place to place. In India and China, the study says, emissions from residential heating and cooling drive air pollution by creating unhealthy quantities of smoke. Overall, residential heating emissions cause one third of air pollution-related deaths worldwide.In highly regulated areas, like the United States, Europe and Japan, emissions from agriculture tend to be primary contributors to air pollution. Fertilizer used in agriculture releases ammonia into atmosphere, a process that creates harmful particulate matter. Globally, air pollution from agriculture kills more than 600,000 people annually, the study finds.The findings are consistent with a 2014 report from the World Health Organization that suggested that 7 million deaths occur annually due to both indoor and outdoor air pollution.The study’s conclusions give a sense of urgency to efforts to reduce air pollution but present challenges because of difficulty regulating heating activity in people’s homes, according to study author Jos Lelieveld. People who live in the most affected areas should be provided with information about less toxic heating methods, he said.‘It’s important to reduce emissions from residential energy us,’ Lelieveld said on a conference call for journalists. ‘You can’t ask people to stop eating and cooking, but you can provide better technologies.’Air pollution contributes to a variety of ailments that eventually lead to premature mortality like lung cancer, stroke and heart failure, according to the study. Another study published this week in the journal Environmental Health Perspectives reached similar conclusions showing the devastating(毁灭性的) effects of pollution on individual health. Researchers found that chronic exposure to particulate matter increases the chance of early death by 13%. That risk is especially high for heart disease; the chance a person will die of heart disease increases by around 10% with chronic exposureto particulate matter.Researchers found that the number of deaths is expected to double by 2050 without new government policies. Nearly all of the increase will occur in Asia, according to the report.(Note: Answer the questions or complete the statements in NO MORE THAN TEN WORDS)78. According to the study, __________________________ is the dominating cause of early death.79. How come agriculture gives rise to air pollution?80. What can be done about residential energy use to reduce air pollution?81.The author wrote the article to __________________________________ .第II 卷(共47分)I. TranslationDirections: Translate the following sentences into English, using the words given in the brackets.1.原来那位女商人从没出过国,也根本不是什么华侨。
上海市七宝中学2016届高三上学期期中考试数学理试题 含答案
2015年七宝中学高三第一学期期中考试理科数学一、填空题1、设集合2{|}M x x x ==,{|lg 0}N x x =≤,则M N =_________。
[0,1]2、已知11(1,)P a 、22(2,)P a 、…(,)nn P n a …是直线上的一列点,且122, 1.2aa =-=-,则这个数列{}n a 的通项公式是___________。
*0.8 2.8()n a n n N =-∈3、设02πθ<<,向量(sin2,cos )a θθ=,(cos ,1)b θ=,若//a b ,则tan θ=___ .124、函数12log (32)y x =-___________.2(,1]35、已知单位向量1e 与2e 的夹角为α,且1cos 3α=,向量1232a e e =-与123b e e =-的夹角为β,则cos β=__________。
226、函数213,(10)x y x -=-≤≤的反函数是___________。
131()log 1(1)3f x x x -=+≤≤7、方程lg(42)lg 2lg 3x x+=+的解是___________。
0x =或1x = 8、,a b 是不等的两正数,若11lim 2n n n nn a b a b ++→∞-=+,则b 的取值范围是___________.(0,2)9、数列{}na 中,已知*111212,(),2n n a a a a a n N +==++⋅⋅⋅⋅⋅⋅+∈,则{}n a 的前n 项和n S =___________。
132()2n n S -=⋅10、若向量a 与b 夹角为3π,||4b =,(2)(3)72a b a b +-=-,则||a =________.611、若三数,1,a c 成等差,且22,1,a c 成等比,则22lim()nn a c a c →∞++值为___________.0或112、已知菱形ABCD 的边长为2,120BAD ∠=,点,E F 分别在边,BC DC 上,3BC BE =,DC DF λ=,若1AE AF ⋅=,则λ的值为___________.213、已知()f x 是定义在[4,4]-上的奇函数,1()(2)3g x f x =-+,当[2,0)(0,2]x ∈-时,||1(),(0)021x g x g ==-,则方程12()log (1)g x x =+的解的个数为___________。
2016年上海七宝中学高三数学第二次三模(2016.05)
, a 0 , b 0 ,记 h( x) f ( x) g ( x ) , x [1, ) ;
(1)试写一组 f ( x ) 、 g ( x) ,使 h(1) 、 h(2) 、 h(3) 是公差不为 0 的等差数列; (2)当 x N * 时,证明: {h( x)} 不可能是公差不为 0 的等差数列; (3)若设 p q 1 , h( x) c x 1 (c 0) ,且 a 、 b 、 c 是三角形的三边长,求 x 的范围;
13. 在直角坐标平面上,已知点 A(0, 2) 、 B(0,1) 、 D (t , 0) , t 0 , M 为线段 AD 上的动 点,若 | AM | 2 | BM | 恒成立,则正实数 t 的最小值为 14. 设 为正实数,若存在 a 、 b , a b 2 ,使得 cos a cos b 2 ,则 的取 值范围是
21. 若 y f ( x ) 对定义域的每一个 x1 , 在其定义域均存在唯一的 x2 , 满足 f ( x1 ) f ( x2 ) 1 , 则称该函数为“依赖函数” ;
1 、 y 2 x 是否为“依赖函数” ; x2 (2)若函数 y a sin x (a 1) , x [ , ] 为依赖函数,求 a 的值,并给出证明; 2 2
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15. 设双曲线 C :
峰行数学
x2 y 2 1 (a 0, b 0) ,若令直线 x x0 ( x0 a 0) 与双曲线 C 在第 a2 b2 b 一象限交于点 M ,与射线 y x ( x 0) 交于点 P ,则当 x0 无限增大时, “ | MP | 无限趋 a b 近于 0 ”是“ y x 为双曲线 C 的渐近线”的( ) a
上海市闵行区七宝中学2015届高考数学三模试卷(理科) Word版含解析
上海市闵行区七宝中学2015届高考数学三模试卷(理科)一、填空题:(本大题共14小题,每小题4分,满分56分).把答案直接填写在答题卷的相应位置上.1.(4分)已知集合A={0,1,a},B={0,3,3a},若A∩B={0,3},则A∪B=.2.(4分)复数在复平面内所对应的点在虚轴上,则实数a=.3.(4分)在等比数列{a n}中,a1=8,a4=a3•a5,则此数列前n项和为.4.(4分)已知偶函数f(x)在(0,+∞)上为减函数,且f(2)=0,则不等式的解集为.5.(4分)如图程序框图,若实数a的值为5,则输出k的值为.6.(4分)在极坐标系中,圆ρ=2与直线ρcosθ+ρsinθ=2交于A,B两点,O为极点,则•=.7.(4分)如图是底面半径为1,母线长均为2的圆锥和圆柱的组合体,则该组合体的体积为.8.(4分)若二项式(x+)n的展开式中第四项与第六项的二项式系数相等,且第四项的系数与第六项的系数之比为1:4,则其常数项为.9.(4分)某类产品按工艺共分10个档次,最低档次产品每件利润为8元.每提2014-2015学年高一个档次,每件利润增加2元.用同样工时,可以生产最低档产品60件,每提2014-2015学年高一个档次将少生产3件产品.则获得利润最大时生产产品的档次是.10.(4分)从甲、乙等五人中任选三人排成一排,则甲不在排头、乙不在排尾的概率为.11.(4分)函数f(x)=Asin(ωx+φ)(其中A>0,|φ|<)的图象如图所示,为了得到g (x)=sin2x的图象,则需将f(x)的图象向右最小平移个长度单位.12.(4分)过点(2,0)且方向向量为(k,1)的直线与双曲线﹣=1仅有一个交点,则实数k的值为.13.(4分)某学校随机抽取100名学生调查其上学所需时间(单位:分钟),并将所得数据绘制成频率分布直方图(如图),其中,上学所需时间的范围是[0,100],样本数据分组为[0,20),[20,40),[40,60),[60,80),[80,100].则该校学生上学所需时间的均值估计为.(精确到1分钟)14.(4分)已知全集为U,P⊈U,定义集合P的特征函数为,对于A⊊U,B⊊U,给出下列四个结论:①对∀x∈U,有;②对∀x∈U,若A⊊B,则f A(x)≤f B(x);③对∀x∈U,有f A∩B(x)=f A(x)•f B(x);④对∀x∈U,有f A∪B(x)=f A(x)+f B(x).其中,正确结论的序号是.二、选择题:(本大题共4小题,每小题5分,满分20分).每小题所给的四个选项中只有一个是正确的,请将正确答案的选项填在答题卷的相应位置上.15.(5分)已知函数f(x)=2x+1,对于任意正数a,|x1﹣x2|<a是|f(x1)﹣f(x2)|<a成立的()A.充分非必要条件B.必要非充分条件C.充要条件D.既不充分也不必要条件16.(5分)函数f(x)=3x﹣log2(﹣x)的零点所在区间是()A.B.(﹣2,﹣1)C.D.(1,2)17.(5分)如果函数y=|x|﹣1的图象与方程x2+λy2=1的曲线恰好有两个不同的公共点,则实数λ的取值范围是()A.(﹣∞,﹣1]∪[0,1)B.[﹣1,1)C.{﹣1,0} D. [﹣1,0)∪(1,+∞)18.(5分)设等差数列{a n}的前n项和为S n,已知,,则下列结论正确的是()A.S2012=2012,a2012<a7B.S2012=2012,a2012>a7C.S2012=﹣2012,a2012<a7D.S2012=﹣2012,a2012>a7三、解答题(本大题满分74分)本大题共有5题,解答下列各题必须写出必要的步骤.每题解题过程写在该题的答题框内,否则不计分.19.(12分)在△ABC中,角A,B,C的对边分别为a,b,c,且.(Ⅰ)求的值;(Ⅱ)若,求△ABC面积的最大值.20.(13分)已知向量=(x2﹣3,1),=(x,﹣y),(其中实数x和y不同时为零),当|x|<2时,有⊥,当|x|≥2时,∥.(1)求函数关系式y=f(x);(2)若对任意x∈(﹣∞,﹣2)∪[2,+∞),都有m≥f(x)恒成立,求实数m的取值范围.21.(13分)如图所示,在三棱锥P﹣ABC中,PD⊥平面ABC,且垂足D在棱AC上,AB=BC=,AD=1,CD=3,PD=.(1)证明△PBC为直角三角形;(2)求直线AP与平面PBC所成角的正弦值.22.(18分)已知椭圆x2+=1的左、右两个顶点分别为A,B,曲线C是以A,B两点为顶点,焦距为2的双曲线.设点P在第一象限且在曲线C上,直线AP与椭圆相交于另一点T.(Ⅰ)求曲线C的方程;(Ⅱ)设P,T两点的横坐标分别为x1,x2,求证:x1•x2为定值;(Ⅲ)设△TAB与△POB(其中o为坐标原点)的面积分别为s1与s2,且≤15,求s12﹣s22的取值范围.23.(18分)实数列a0,a1,a2,a3,…,由下述等式定义:a n+1=2n﹣3a n,n=0,1,2,3,…(1)若a0为常数,求a1,a2,a3的值;(2)令b n=,求数列{b n}(n∈N)的通项公式(用a0、n来表示);(3)是否存在实数a0,使得数列{a n}(n∈N)是单调递增数列?若存在,求出a0的值;若不存在,说明理由.上海市闵行区七宝中学2015届高考数学三模试卷(理科)参考答案与试题解析一、填空题:(本大题共14小题,每小题4分,满分56分).把答案直接填写在答题卷的相应位置上.1.(4分)已知集合A={0,1,a},B={0,3,3a},若A∩B={0,3},则A∪B={0,1,3,9}.考点:并集及其运算.专题:集合.分析:根据集合的基本运算进行求解即可.解答:解:∵A∩B={0,3},∴a=3,则B={0,3,9},则A∪B={0,1,3,9},故答案为:{0,1,3,9},点评:本题主要考查集合的基本运算,比较基础.2.(4分)复数在复平面内所对应的点在虚轴上,则实数a=.考点:复数代数形式的乘除运算.专题:数系的扩充和复数.分析:利用复数代数形式的乘除运算化简,然后由实部等于0且虚部吧等于0求得a的值.解答:解:∵=,又复数在复平面内所对应的点在虚轴上,则,即a=.故答案为:.点评:本题考查复数代数形式的乘除运算,考查复数的基本概念,是基础题.3.(4分)在等比数列{a n}中,a1=8,a4=a3•a5,则此数列前n项和为S n=16(1﹣).考点:等比数列的前n项和.专题:等差数列与等比数列.分析:根据等比中项的性质和已知等式求得a4,进而求得q,最后利用等比数列求和公式求得答案.解答:解:=a3•a5=a4,∴a4=1,q3==,q=,∴S n==16(1﹣),故答案为:S n=16(1﹣).点评:本题主要考查了等比数列的性质和等比数列的求和公式.基础性很强.4.(4分)已知偶函数f(x)在(0,+∞)上为减函数,且f(2)=0,则不等式的解集为(﹣∞,﹣2)∪(0,2).考点:奇偶性与单调性的综合.专题:综合题.分析:偶函数f(x)在(0,+∞)上为减函数,且f(2)=0,所以函数f(x)在(﹣∞,0)上为增函数,且f(﹣2)=0,故抽象不等式可转化为具体不等式,故可求.解答:解:由题意,不等式等价于∴等价于或∵偶函数f(x)在(0,+∞)上为减函数,且f(2)=0,∴函数f(x)在(﹣∞,0)上为增函数,且f(﹣2)=0,∴或∴不等式的解集为(﹣∞,﹣2)∪(0,2)故答案为:(﹣∞,﹣2)∪(0,2).点评:本题考查解不等式,考查单调性与奇偶性的结合,确定函数的单调性是解题的关键.5.(4分)如图程序框图,若实数a的值为5,则输出k的值为5.考点:程序框图.专题:图表型;算法和程序框图.分析:执行程序框图,写出每次循环得到的n,k的值,当n=1,k=5时,满足条件n=1,退出循环,输出k的值为5.解答:解:执行程序框图,有n=5,k=0不满足条件n为偶数,n=16,k=1不满足条件n=1,满足条件n为偶数,n=8,k=2不满足条件n=1,满足条件n为偶数,n=4,k=3不满足条件n=1,满足条件n为偶数,n=2,k=4不满足条件n=1,满足条件n为偶数,n=1,k=5满足条件n=1,退出循环,输出k的值为5.故答案为:5.点评:本题主要考察了循环结构的程序框图和算法,属于基本知识的考查.6.(4分)在极坐标系中,圆ρ=2与直线ρcosθ+ρsinθ=2交于A,B两点,O为极点,则•=0.考点:简单曲线的极坐标方程.专题:坐标系和参数方程.分析:化极坐标方程为直角坐标方程,联立方程组求得A,B的坐标,由数量积的坐标运算得答案.解答:解:由圆ρ=2,得x2+y2=4,由直线ρcosθ+ρsinθ=2,得x+y=2.联立,得或.∴•=(2,0)•(0,2)=2×0+0×2=0.故答案为:0.点评:本题考查简单曲线的极坐标方程化直角坐标方程,考查了方程组的解法,训练了平面向量数量积的坐标运算,是基础题.7.(4分)如图是底面半径为1,母线长均为2的圆锥和圆柱的组合体,则该组合体的体积为(2+)π.考点:棱柱、棱锥、棱台的体积.专题:计算题;空间位置关系与距离.分析:分别计算圆锥和圆柱的体积,即可得出结论.解答:解:由题意,圆锥的高为,体积为=π,圆柱的体积为π•12•2=2π,∴该组合体的体积为(2+)π.故答案为:(2+)π.点评:本题考查圆锥和圆柱的体积,考查学生的计算能力,比较基础.8.(4分)若二项式(x+)n的展开式中第四项与第六项的二项式系数相等,且第四项的系数与第六项的系数之比为1:4,则其常数项为1120.考点:二项式系数的性质.专题:二项式定理.分析:由题意可得n,写出二项展开式的通项,求出第四项的系数与第六项的系数,由系数比求得a值,再由x的指数为0求得r值,则常数项可求.解答:解:由二项式(x+)n的展开式中第四项与第六项的二项式系数相等,可得二项展开式有9项,则n=8.由=,当r=3时,可得第四项的系数为,当r=5时,可得第六项的系数为,由,解得a=±2.由8﹣2r=0,得r=4.∴常数项为:.故答案为:1120.点评:本题考查二项式系数的性质,关键是对二项展开式通项的记忆与应用,是基础题.9.(4分)某类产品按工艺共分10个档次,最低档次产品每件利润为8元.每提2014-2015学年高一个档次,每件利润增加2元.用同样工时,可以生产最低档产品60件,每提2014-2015学年高一个档次将少生产3件产品.则获得利润最大时生产产品的档次是9档次.考点:函数最值的应用.专题:计算题;函数的性质及应用.分析:档次提高时,带来每件利润的提高,产量下降,第k档次时,每件利润为[8+2(k﹣1)],产量为[60﹣3(k﹣1)],根据:利润=每件利润×产量,列函数式,利用配方法求函数的最值,即可得到结论.解答:解:由题意,第k档次时,每天可获利润为:y=[8+2(k﹣1)][60﹣3(k﹣1)]=﹣6k2+108k+378(1≤x≤10)配方可得y=﹣6(k﹣9)2+864,∴k=9时,获得利润最大故答案为:9档次点评:本题考查二次函数,考查利用数学知识解决实际问题,属于基础题.10.(4分)从甲、乙等五人中任选三人排成一排,则甲不在排头、乙不在排尾的概率为.考点:计数原理的应用.专题:概率与统计;排列组合.分析:先根据排列组合求出没有限制条件的种数,再根据分类计数原理,求出甲不在排头、乙不在排尾的种数,根据概率公式计算即可.解答:解:从甲、乙等五人中任选三人排成一排,故有A53=60,甲不在排头、乙不在排尾,可以分4类,有甲有乙时,若甲在排尾,则有A21A31=6种,若甲在中间,则有A31=3种,故有6+3=9种,有甲无乙时,有A21A32=12种,无甲有乙时,有A21A32=12种,无甲无乙时,有A33=6种,根据分类计数原理,共有9+12+12+6=39,根据概率公式,故则甲不在排头、乙不在排尾的概率为P==.故答案为:.点评:本题考查了古典概型的概率问题,以及分类计数原理,关键是如何分类,属于中档题.11.(4分)函数f(x)=Asin(ωx+φ)(其中A>0,|φ|<)的图象如图所示,为了得到g(x)=sin2x的图象,则需将f(x)的图象向右最小平移个长度单位.考点:由y=Asin(ωx+φ)的部分图象确定其解析式;函数y=Asin(ωx+φ)的图象变换.专题:三角函数的求值;三角函数的图像与性质.分析:首先根据函数的图象确定A、ω、φ的值,进一步确定解析式,然后利用函数图象的平移变换求得结果.解答:解:根据函数的图象:A=1T=所以:ω=2当x=由于|φ|<)解得:f(x)=sin(2x+)要得到g(x)=sin2x的图象,则需将f(x)的图象向右最小平移个单位即可.故答案为:点评:本题考查的知识要点:函数图象解析式的求法,函数图象的平移变换,属于基础题型.12.(4分)过点(2,0)且方向向量为(k,1)的直线与双曲线﹣=1仅有一个交点,则实数k的值为0或±.考点:双曲线的简单性质.专题:直线与圆;圆锥曲线的定义、性质与方程.分析:先根据直线的方程可知直线恒过(2,0)点,进而可推断出要使直线与双曲只有一个公共点,需直线与双曲线相切或与渐近线平行,进而根据双曲线方程求得其渐近线方程,求得k的值.解答:解:依题意可知直线l恒过(2,0)点,即双曲线的右顶点,双曲线的渐近线方程为y=±x,要使直线与双曲线只有一个公共点,则该直线与双曲线相切,即垂直于x轴,即有k=0;当直线与渐近线平行,即有=±,即k=±,此时直线与双曲线仅有一个交点.故答案为:0或±.点评:本题主要考查了直线与圆锥曲线的位置关系.直线与圆锥曲线有无公共点或有几个公共点的问题,实际上是研究它们的方程组成的方程是否有实数解或实数解的个数问题,此时要注意用好分类讨论和数形结合的思想方法.13.(4分)某学校随机抽取100名学生调查其上学所需时间(单位:分钟),并将所得数据绘制成频率分布直方图(如图),其中,上学所需时间的范围是[0,100],样本数据分组为[0,20),[20,40),[40,60),[60,80),[80,100].则该校学生上学所需时间的均值估计为33.6.(精确到1分钟)考点:频率分布直方图.专题:概率与统计.分析:由题意,可由直方图中各个小矩形的面积和为1求出x值.根据直方图求平均值的公式,各个小矩形的面积乘以相应组距的中点的值,将它们相加即可得到平均值解答:解:解:由直方图可得(x+0.025+0.0065+0.003×2)×20=1.所以x=0.0125.该校学生上学所需时间的均值估计为:10×20×0.0125+30×20×0.025+50×20×0.0065+70×20×0.003+90×20×0.003=33.6分钟.故该校新生上学所需时间的平均值为33.6分故答案:33.6.点评:本题考查频率分布直方图,解题的关键是理解直方图中各个小矩形的面积的意义及各个小矩形的面积和为1,本题考查了识图的能力14.(4分)已知全集为U,P⊈U,定义集合P的特征函数为,对于A⊊U,B⊊U,给出下列四个结论:①对∀x∈U,有;②对∀x∈U,若A⊊B,则f A(x)≤f B(x);③对∀x∈U,有f A∩B(x)=f A(x)•f B(x);④对∀x∈U,有f A∪B(x)=f A(x)+f B(x).其中,正确结论的序号是①、②、③.考点:全称命题.专题:函数的性质及应用.分析:利用特殊值法,先设出特殊的集合U,A,B,然后再验证判断四个命题的真假即可得出答案.解答:解:利用特殊值法进行求解.设U={1,2,3},A={1},B={1,2}.那么:对于①有f A(1)=1,f A(2)=0,f A(3)=0,f(1)=0,f(2)=1,f(3)=1.可知①正确;对于②有f A(1)=1=f B(1),f A(2)=0<f B(2)=1,f A(3)=f B(3)=0可知②正确;对于③有f A(1)=1,f A(2)=0,f A(3)=0,f B(1)=1,f B(2)=1,f B(3)=0,f A∩B(1)=1,f A∩B(2)=0,f A∩B(3)=0.可知③正确;对于④有f A(1)=1,f A(2)=0,f A(3)=0,f B(1)=1,f B(2)=1,f B(3)=0,f A∪B(1)=1,f A∪B(2)=1,f A∪B(3)=0可知.④不正确;故答案为:①、②、③.点评:本题考查集合的基本运算,特值法判断选项的正误能够快速解答选择题,理解题意是本题解答的关键.二、选择题:(本大题共4小题,每小题5分,满分20分).每小题所给的四个选项中只有一个是正确的,请将正确答案的选项填在答题卷的相应位置上.15.(5分)已知函数f(x)=2x+1,对于任意正数a,|x1﹣x2|<a是|f(x1)﹣f(x2)|<a成立的()A.充分非必要条件B.必要非充分条件C.充要条件D.既不充分也不必要条件考点:必要条件、充分条件与充要条件的判断.专题:综合题.分析:由|x1﹣x2|<a不能推出|f(x1)﹣f(x2)|<a;而由|f(x1)﹣f(x2)|<a,能推出|x1﹣x2|<a,由简易逻辑的知识可得正确答案.解答:解:由|x1﹣x2|<a,得|f(x1)﹣f(x2)|=|(2x1+1)﹣(2x2+1)|=2|x1﹣x2|<2a,不能推出|f(x1)﹣f(x2)|<a;而由|f(x1)﹣f(x2)|<a得,2|x1﹣x2|<a,即|x1﹣x2|,当然能推出|x1﹣x2|<a故|x1﹣x2|<a是|f(x1)﹣f(x2)|<a成立的必要非充分条件,故选B点评:本题考查充要条件,关键是看|x1﹣x2|<a能否推出|f(x1)﹣f(x2)|<a;|f(x1)﹣f(x2)|<a能否推出|x1﹣x2|<a,属基础题.16.(5分)函数f(x)=3x﹣log2(﹣x)的零点所在区间是()A.B.(﹣2,﹣1)C.D.(1,2)考点:函数零点的判定定理.专题:计算题.分析:要判断函数f(x)=3x﹣log2(﹣x)的零点所在区间,我们可以利用零点存在定理,即函数f(x)在区间(a,b)上若f(a)•(b)<0,则函数f(x)在区间(a,b)上有零点,分析四个区间,易得答案.解答:解:∵f(﹣2)=3﹣2﹣log22<0f(﹣1)=3﹣1﹣log21=﹣0=>0∴f(﹣2)•f(﹣1)<0∴函数f(x)=3x﹣log2(﹣x)在区间(﹣2,﹣1)必有零点故选B.点评:本题考查的知识点是根的存在性及根的个数判断,牢固掌握零点存在定理,即函数f (x)在区间(a,b)上若f(a)•(b)<0,则函数f(x)在区间(a,b)上有零点,是解答本题的关键.17.(5分)如果函数y=|x|﹣1的图象与方程x2+λy2=1的曲线恰好有两个不同的公共点,则实数λ的取值范围是()A.(﹣∞,﹣1]∪[0,1)B.[﹣1,1)C.{﹣1,0} D. [﹣1,0)∪(1,+∞)考点:直线与圆锥曲线的关系.专题:综合题;圆锥曲线的定义、性质与方程.分析:利用绝对值的几何意义,由y=|x|﹣1可得,x≥0时,y=x﹣1;x<0时,y=﹣x﹣1,确定函数y=|x|﹣1的图象与方程x2+λy2=1的曲线必相交于(±1,0),为了使函数y=|x|﹣1的图象与方程x2+λy2=1的曲线恰好有两个不同的公共点,则两曲线无其它交点.y=x﹣1代入方程x2+λy2=1,整理可得(1+λ)x2﹣2λx+λ﹣1=0,分类讨论,可得结论,根据对称性,同理可得x<0时的情形.解答:解:由y=|x|﹣1可得,x≥0时,y=x﹣1;x<0时,y=﹣x﹣1,∴函数y=|x|﹣1的图象与方程x2+λy2=1的曲线必相交于(±1,0)所以为了使函数y=|x|﹣1的图象与方程x2+λy2=1的曲线恰好有两个不同的公共点,则y=x﹣1代入方程x2+λy2=1,整理可得(1+λ)x2﹣2λx+λ﹣1=0当λ=﹣1时,x=1满足题意,由于△>0,1是方程的根,∴0,即﹣1<λ<1时,方程两根异号,满足题意;y=﹣x﹣1代入方程x2+λy2=1,整理可得(1+λ)x2+2λx+λ﹣1=0当λ=﹣1时,x=﹣1满足题意,由于△>0,﹣1是方程的根,∴0,即﹣1<λ<1时,方程两根异号,满足题意;综上知,实数λ的取值范围是[﹣1,1)故选B.点评:本题考查曲线的交点,考查学生分析解决问题的能力,考查分类讨论的数学思想,属于中档题.18.(5分)设等差数列{a n}的前n项和为S n,已知,,则下列结论正确的是()A.S2012=2012,a2012<a7B.S2012=2012,a2012>a7C.S2012=﹣2012,a2012<a7D.S2012=﹣2012,a2012>a7考点:等差数列的性质;等差数列的前n项和.专题:计算题.分析:先确定等差数列的公差d<0,再将条件相加,结合等差数列的求和公式及等差数列的性质,即可求得结论.解答:解:由,,可得a7﹣1>0,﹣1<a2006﹣1<0,即a7>1,0<a2006<1,从而可得等差数列的公差d<0 ∴a2012<a7,把已知的两式相加可得(a7﹣1)3+2012(a7﹣1)+(a2006﹣1)3+2012(a2006﹣1)=0整理可得(a7+a2006﹣2)•[(a7﹣1)2+(a2006﹣1)2﹣(a7﹣1)(a2006﹣1)+2012]=0结合上面的判断可知(a7﹣1)2+(a2006﹣1)2﹣(a7﹣1)(a2006﹣1)+2012>0所以a7+a2006=2,而s2012=(a1+a2012)=(a7+a2006)=2012故选A.点评:本题考查了等差数列的性质的运用,灵活利用等差数列的性质是解决问题的关键,属于中档题.三、解答题(本大题满分74分)本大题共有5题,解答下列各题必须写出必要的步骤.每题解题过程写在该题的答题框内,否则不计分.19.(12分)在△ABC中,角A,B,C的对边分别为a,b,c,且.(Ⅰ)求的值;(Ⅱ)若,求△ABC面积的最大值.考点:余弦定理;二倍角的正弦;二倍角的余弦;正弦定理.专题:计算题.分析:(Ⅰ)通过求出,利用二倍角以及三角形的内角和化简,即可求出它的值;(Ⅱ)利用,结合余弦定理,求出a,c的关系,通过基本不等式求出a,c,然后求出三角形的面积最大值.解答:(本小题满分13分)解:(I)因为,所以.…(1分)又==+=.…(6分)(II)由已知得,…(7分)又因为,所以.…(8分)又因为,所以ac≤6,当且仅当时,ac取得最大值.…(11分)此时.所以△ABC的面积的最大值为.…(13分)点评:本题考查二倍角公式,余弦定理,基本不等式的应用,考查计算能力.20.(13分)已知向量=(x2﹣3,1),=(x,﹣y),(其中实数x和y不同时为零),当|x|<2时,有⊥,当|x|≥2时,∥.(1)求函数关系式y=f(x);(2)若对任意x∈(﹣∞,﹣2)∪[2,+∞),都有m≥f(x)恒成立,求实数m的取值范围.考点:函数恒成立问题;平面向量数量积的运算.专题:函数的性质及应用.分析:(1)根据向量垂直和向量平行的坐标公式即可求函数关系式y=f(x);(2)根据不等式恒成立转化为求函数f(x)的最大值即可得到结论.解答:解:(1)当|x|<2时,由⊥可得:•=(x2﹣3)x﹣y=0﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣1’∴y=x3﹣3x(|x|<2且x≠0)﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣3’当|x|≥2时,由∥可得:y=﹣=﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣5’∴f(x)=﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣6’(2)由题意知m≥f(x)=,当x∈(﹣∞,﹣2)∪[2,+∞)恒成立,∴m≥f(x)max,﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣7’当x∈(﹣∞,﹣2)时,f(x)=>0,而当当x∈[2,+∞)时,f(x)<0∴f(x)=的最大值必在(﹣∞,﹣2]上取到﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣8’当x1<x2≤﹣2时,f(x1)﹣f(x2)=<0,即函数f(x)在(﹣∞,﹣2]上单调递增,﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣11’∴f(x)max=f(﹣2)=2﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣12’∴实数m的取值范围为[2,+∞)﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣13’点评:本题主要考查函数解析式的求解以及向量平行和垂直的坐标公式,将不等式恒成立转化为求函数的最值是解决恒成立问题的基本策略.21.(13分)如图所示,在三棱锥P﹣ABC中,PD⊥平面ABC,且垂足D在棱AC上,AB=BC=,AD=1,CD=3,PD=.(1)证明△PBC为直角三角形;(2)求直线AP与平面PBC所成角的正弦值.考点:直线与平面所成的角;直线与平面垂直的判定.专题:空间角.分析:(1)建立空间坐标系,利用向量法即可证明△PBC为直角三角形;(2)求出平面的法向量,利用向量法即可求直线AP与平面PBC所成角的正弦值.解答:解:(1)以点E为坐标原点,以EB,EC所在的直线分别为x轴,y轴建立如图的空间直角坐标系E﹣xyz﹣﹣﹣﹣﹣1’则B(,0,0),C(0,2,0),P(0,﹣1,)﹣﹣﹣﹣2’于是=(﹣,﹣1,),=(﹣,2,0),∵•=(﹣,﹣1,)•(﹣,2,0)=2﹣2=0,∴⊥,即BP⊥BC,﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣5’∴△PBC为直角三角形﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣6’(2)由(1)可得,A(0,﹣2,0)于是=(0,1,),﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣7’=(,1,﹣),=(0,3,﹣),设平面PBC的法向量为=(x,y,z)则,即,取y=1,则z=,x=,∴平面PBC的一个法向量为=(,1,)﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣10’设直线AP与平面PBC所成的角为θ,则sinθ=|cos<,>|===,则θ=arcsin﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣12’则直线AP与平面PBC所成角的大小为arcsin﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣13’点评:本题主要考查空间向量的应用,建立空间坐标系,利用向量法是解决直线和平面所成角的基本方法,考查学生的运算能力.22.(18分)已知椭圆x2+=1的左、右两个顶点分别为A,B,曲线C是以A,B两点为顶点,焦距为2的双曲线.设点P在第一象限且在曲线C上,直线AP与椭圆相交于另一点T.(Ⅰ)求曲线C的方程;(Ⅱ)设P,T两点的横坐标分别为x1,x2,求证:x1•x2为定值;(Ⅲ)设△TAB与△POB(其中o为坐标原点)的面积分别为s1与s2,且≤15,求s12﹣s22的取值范围.考点:直线与圆锥曲线的综合问题.专题:圆锥曲线中的最值与范围问题.分析:(Ⅰ)由椭圆性质求出A(﹣1,0),B(1,0).由题意知双曲线的焦距2c=,实半轴a=1,由此能求出双曲线C的方程.(Ⅱ)设点P(x1,y1),T(x2,y2)(x1>0,x2>0),则直线AP的方程为y=k(x+1),代入,得(4+k2)x2+2k2x+k2﹣4=0,由此能证明为x1•x2为定值.(Ⅲ)由已知条件推导出,,从而得到1<x1≤2,由此能求出的取值范围为[0,1].解答:(Ⅰ)解:∵椭圆x2+=1的左、右两个顶点分别为A,B,∴A(﹣1,0),B(1,0).∵曲线C是以A,B两点为顶点,焦距为2的双曲线,∴双曲线的焦距2c=,实半轴a=1,∴.∴双曲线C的方程为.(Ⅱ)证明:设点P(x1,y1),T(x2,y2)(x1>0,x2>0),直线AP的斜率为k(k>0),则直线AP的方程为y=k(x+1),代入,整理,得(4+k2)x2+2k2x+k2﹣4=0,解得x=﹣1或,所以.同理将直线方程代入,解得.∴为定值.(Ⅲ)解:由(Ⅱ)知,,又,∴,即,∵点P在双曲线上,则,∴,即,又点P是双曲线在第一象限内的点,∴1<x1≤2,∵,所以.由(Ⅱ)知x1•x2=1,即,,设,则1<t≤4,∴,∵在(1,2]上单调递减,在[2,4]上单调递增,∴当t=4,即x1=2时,.当t=2,即.∴的取值范围为[0,1].点评:本题考查曲线方程的求法,考查两数乘积为定值的证明,考查两三角形面积的平方差的取值范围的求法,解题时要注意函数与方程思想的合理运用.23.(18分)实数列a0,a1,a2,a3,…,由下述等式定义:a n+1=2n﹣3a n,n=0,1,2,3,…(1)若a0为常数,求a1,a2,a3的值;(2)令b n=,求数列{b n}(n∈N)的通项公式(用a0、n来表示);(3)是否存在实数a0,使得数列{a n}(n∈N)是单调递增数列?若存在,求出a0的值;若不存在,说明理由.考点:数列递推式;数列与函数的综合.专题:等差数列与等比数列.分析:(1)由a n+1=2n﹣3a n,分别令n=0,1,2即可得出;(2)由b n=,a n+1=2n﹣3a n,可得b n+1﹣b n==,利用“累加求和”、等比数列的前n项和公式即可得出;(3)a n=+,可得a n+1﹣a n=﹣4(﹣3)n+,要使{a n}为递增数列,则a n+1﹣a n>0对任意n∈N*恒成立,对a0分类讨论即可得出.解答:解:(1)∵a n+1=2n﹣3a n,∴a1=1﹣3a0,a2=2﹣3a1=﹣1+9a0,a3=7﹣27a0.(2)由b n=,a n+1=2n﹣3a n,∴b n+1﹣b n==,∴b n+(b n﹣b n﹣1)+(b n﹣1﹣b n﹣2)+…+(b2﹣b1)+b1=++…+++b1=b1=b1﹣×=b1+,∴b n=﹣+=a0﹣+.(3)a n=(﹣3)n =+,∴a n+1﹣a n=﹣4(﹣3)n +,要使{a n}为递增数列,则a n+1﹣a n>0对任意n∈N*恒成立,当a0>时,∵|﹣3|>2,∴当n→+∞且n为偶数时,a n+1﹣a n<0;当a0>时,∵|﹣3|>2,∴当n→+∞且n为奇数时,a n+1﹣a n<0;而当时,则a n+1﹣a n =>0对任意n∈N*恒成立,∴存在实数a0=,使得数列{a n}是单调递增数列.点评:本题考查了递推式的应用、等比数列的前n项和公式、数列的单调性、分类讨论思想方法,考查了推理能力与计算能力,属于中档题.- 21 -。
2016年闵行高三一模(理)(官方版)
闵行区2015学年第一学期高三年级质量调研考试数 学 试 卷(理科)(满分150分,时间120分钟)一、填空题(本大题满分56分)本大题共有14题,考生应在答题纸上相应编号的空格内直接填写结果, 每个空格填对得4分,否则一律得零分.1.若复数z 满足i 3i z =-(i 为虚数单位),则||z = . 2.若全集U =R ,函数21x y =的值域为集合A ,则U A =ð . 3.方程4260xx--=的解为 .4.函数()cos()sin sin()cos x xf x x x π-=π+的最小正周期T = .5.不等式x x>4的解集为 .6.若一圆锥的底面半径为3,体积是12π,则该圆锥的侧面积等于 .7.已知ABC △中,43AB i j =+ ,34AC i j =-+,其中i j 、是基本单位向量,则ABC △的面积为 .8.在2017年的上海高考改革方案中,要求每位考生必须在物理、化学、生物、政治、历史、地理6门学科中选择3门学科参加等级考试.小明同学决定在生物、政治、历史三门中至多选择一门,那么小明同学的选科方案有 种.9.若n S 是等差数列{}n a 的前n 项和,且861086S S =+,则2lim n n S n →∞= . 10.若函数()2x af x -=()a ∈R 满足(1)(1)f x f x +=-,且()f x 在[,)m +∞上单调递增,则实数m 的最小值等于 .11.若点P 、Q 均在椭圆2222:11x y a a Γ+=-(1)a >上运动,12F F 、是椭圆Γ的左、右焦点,则122PF PF PQ +-的最大值为 .12.已知函数14cos 042()log (3)1 4x x f x x x π⎧≤≤⎪=⎨-+>⎪⎩,,,若实数a b c 、、互不相等,且满足)()()(c f b f a f ==,则a b c ++的取值范围是 .13.我国南北朝数学家何承天发明的“调日法”是程序化寻求精确分数来表示数值的算法,其理论依据是:设实数x 的不足近似值和过剩近似值分别为b a 和dc (*,,,a b c d ∈N ),则b d a c++是x 的更为精确的不足近似值或过剩近似值.我们知道 3.14159π=⋅⋅⋅,若令31491015<π<,则第一次用“调日法”后得165是π的更为精确的过剩近似值,即3116105<π<,若每次都取最简分数,那么第四次用“调日法”后可得π的近似分数为 .14.已知数列{}n a 的前n 项和为n S ,对任意n ∈*N ,1(1)32nn n nS a n =-++-且1()()0n n a p a p +--<恒成立,则实数p 的取值范围是 .二、选择题(本大题满分20分)本大题共有4题,每题只有一个正确答案.考生应在答题纸的相应编号上, 将代表答案的小方格涂黑,选对得5分,否则一律得零分. 15.若,a b ∈R ,且0ab >,则“a b =”是“2b aa b+≥等号成立”的( ). (A) 充要条件 (B) 充分不必要条件 (C) 必要不充分条件 (D) 既非充分又非必要条件 16.设2345()2510105f x x x x x x =+++++,则其反函数的解析式为( ).(A) 511y x =+- (B) 511y x =-- (C) 511y x =-+- (D) 511y x =--- 17.ABC △的内角,,A B C 的对边分别为c b a ,,,满足a b c cb a b c-+≤+-,则角A 的范围是( ). (A)0,π⎛⎤⎥6⎝⎦ (B) 0,π⎛⎤ ⎥3⎝⎦ (C) ,π⎡⎫π⎪⎢6⎣⎭ (D) ,π⎡⎫π⎪⎢3⎣⎭18.函数()f x 的定义域为[]1,1-,图像如图1所示;函数()g x 的定义域为[]1,2-,图像如图2所示.{}(())0A x f g x ==,{}(())0B x g f x ==,则A B 中元素的个数为( ).(A) 1 (B) 2 (C) 3 (D) 4三、解答题(本大题满分74分)本大题共有5题,解答下列各题必须在答题纸相应编号的规定区域内写出必要的步骤.19.(本题满分12分)如图,三棱柱111ABC A B C -中,侧棱⊥1AA 底面ABC ,12AA AB ==,1BC =,BAC π∠=6, D 为棱1AA 中点,证明异面直线11B C 与CD 所成角为π2,并求三棱柱111ABC A B C -的体积.CABDA 1B 1C 1x y -1 O1 2 1图2 x y -1 O 1 1 -1 图120.(本题满分14分)本题共有2个小题,第(1)小题满分8分,第(2)小题满分6分.如图,点A 、B 分别是角α、β的终边与单位圆的交点,02βαπ<<<<π.(1)若3=4απ,()2cos 3αβ-=,求sin 2β的值;(2)证明:cos()cos cos sin sin αβαβαβ-=+.21.(本题满分14分)本题共有2个小题,第(1)小题满分6分,第(2)小题满分8分.某沿海城市的海边有两条相互垂直的直线型公路1l 、2l ,海岸边界MPN 近似地看成一条曲线段.为开发旅游资源,需修建一条连接两条公路的直线型观光大道AB ,且直线AB 与曲线MPN 有且仅有一个公共点P (即直线与曲线相切),如图所示.若曲线段MPN 是函数ay x=图像的一段,点M 到1l 、2l 的距离分别为8千米和1千米,点N 到2l 的距离为10千米,以1l 、2l 分别为x y 、轴建立如图所示的平面直角坐标系xOy ,设点P 的横坐标为p .(1)求曲线段MPN 的函数关系式,并指出其定义域;(2)若某人从点O 沿公路至点P 观景,要使得沿折线OAP 比沿折线OBP 的路程更近,求p 的取值范围.OxyA Bxy AB MNPO大海1l2l22.(本题满分16分)本题共有3个小题,第(1)小题满分4分,第(2) (3)小题满分各6分.已知椭圆Γ的中心在坐标原点,且经过点3(1,)2,它的一个焦点与抛物线2:4y x E =的焦点重合. (1)求椭圆Γ的方程;(2)斜率为k 的直线l 过点()1,0F ,且与抛物线E 交于A B 、两点,设点(1,)P k -,PAB △的面积为43,求k 的值;(3)若直线l 过点()0,M m (0m ≠),且与椭圆Γ交于C D 、两点,点C 关于y 轴的对称点为Q ,直线QD 的纵截距为n ,证明:mn 为定值.23.(本题满分18分)本题共有3个小题,第(1)小题满分4分,第(2)小题满分6分,第(3)小题满分8分.已知数列{}n a 的各项均为整数,其前n 项和为n S .规定:若数列{}n a 满足前r 项依次成公差为1的等差数列,从第1r -项起往后依次成公比为2的等比数列,则称数列{}n a 为“r 关联数列”. (1)若数列{}n a 为“6关联数列”,求数列{}n a 的通项公式;(2)在(1)的条件下,求出n S ,并证明:对任意n ∈*N ,66n n a S a S ≥;(3)已知数列{}n a 为“r 关联数列”,且110a =-,是否存在正整数,()k m m k >,使得121121?k k m m a a a a a a a a --++++=++++ 若存在,求出所有的,k m 值;若不存在,请说明理由.闵行区2015学年第一学期高三年级质量调研考试数 学 试 卷(理科)一、填空题(本大题满分56分)1.2 2.)0,(-∞ 3.2log 3x = 4.π 5.)2,0( 6.15π 7.2528.10 9.5 10.1 11.2a 12.(8 23), 13.22714.311,44⎛⎫- ⎪⎝⎭二、选择题(本大题满分20分) 15.A 16.C 17.B 18.C三、解答题(本大题满分74分) 19.(本题满分12分)[证明] 在三棱柱111ABC A B C -中,侧棱⊥1AA 底面ABC ,11//BC B C ,BCD ∴∠或它的补角即为异面直线11B C 与CD 所成角,…………………………2分由2AB =,1BC =,BAC π∠=6以及正弦定理得sin ACB ∠=1,ACB π∴∠=2即BC AC ⊥,……4分 又1BC AA ∴⊥,11BC ACC A ∴⊥面,…………6分 BC CD ∴⊥………………8分所以异面直线11B C 与CD 所成角的为2π.…………………… 10分 三棱柱111ABC A B C -的体积为1131232ABC V S AA =⋅=⋅⋅⋅=△. …………12分20.(本题满分14分)本题共有2个小题,第(1)小题满分8分,第(2)小题满分6分. [解](1)方法一: ()2cos 3αβ-=,1)(cos 2)22cos(2--=-∴βαβα=91- …3分3=4απ,即91)223cos(-=-βπ, ………………………………6分 912sin =∴β. ………………………………8分方法二: ()2cos 3αβ-=,3=4απ,即32sin 22cos 22=+-ββ, …………3分 322cos sin =-∴ββ,两边平方得,982sin 1=-β ……………………………6分912sin =∴β. …………………………………8分(2)[证明]由题意得,)sin ,(cos αα=OA ,)sin ,(cos ββ=OB OB OA ⋅∴=βαβαsin sin cos cos +………………10分又因为OA 与OB 夹角为βα-,1==OB OAOB OA ⋅∴=)cos()cos(βαβα-=-⋅OB OA ………………………12分 综上cos()cos cos sin sin αβαβαβ-=+成立. ……………………………14分 21.(本题满分14分)本题共有2个小题,第(1)小题满分6分,第(2)小题满分8分. [解](1)由题意得(1,8)M ,则8a =,故曲线段MPN 的函数关系式为8y x=,…4分 又得4(10,)5N ,所以定义域为[]1,10. ……………………………6分(2)8(,)P p p ,设8:()AB y k x p p -=-由8()8y k x p p y x ⎧-=-⎪⎪⎨⎪=⎪⎩得22(8)80kpx kp x p +--=,22222(8)32(8)0kp kp kp ∆=-+=+=, …………8分22880,kp k p∴+=∴=-,得直线AB 方程为288()y x p p p -=--, ………10分 得16(0,)(2,0)A B p p、,故点P 为AB 线段的中点, 由2168220p p p p--=⋅>即280p -> …………………………12分得22p >时,OA OB <,所以,当2210p <≤时,经点A 至P 路程最近. 14分 22.(本题满分16分)本题共有3个小题,第(1)小题满分4分,第(2) (3)小题满分各6分.[解](1)设椭圆的方程为()222210x y a b a b +=>>,由题设得222219141a ba b ⎧+=⎪⎨⎪=+⎩,…2分 2243a b ⎧=∴⎨=⎩,∴椭圆Γ的方程是22143x y += …………………………4分 (2)设直线:(1)l y k x =-,由2(1),4,y k x y x =-⎧⎨=⎩得22222(2)0k x k x k -++= l 与抛物线E 有两个交点,0k ≠,216(1)0k ∆=+>,则42422224(44)44(1)1k k k k AB k k k ++-+=⋅+=…………………………6分 (1,)P k -到l 的距离231k d k =+,又43PABS =△,222314(1)4321kk k k +∴⋅⋅=+ 22433k k =+,故3k =±. ………………………10分(3) ()()1122,,,C x y D x y ,点C 关于y 轴的对称点为11(,)Q x y -,则直线211121:()y y CD y y x x x x --=--,设0x =得121211212121()x y y x y x ym y x x x x --=-=--直线211121:()y y QD y y x x x x --=++,设0x =得121211212121()x y y x y x yn y x x x x -+=+=++14分222221122221x y x y mn x x -∴=-,又2211143x y +=,2222143x y +=22113(4)4y x ∴=-,22223(4)4y x =- 22222222211221122222212133(4)(4)443x x x x x y x y mn x x x x ⋅--⋅--∴===--.………………………16分 23.(本题满分18分)本题共有3个小题,第(1)小题满分4分,第(2)小题满分6分,第(3)小题满分8分. [解](1) {}n a 为“6关联数列”,∴{}n a 前6项为等差数列,从第5项起为等比数列,4,51516+=+=∴a a a a 且256=a a , 即24511=++a a ,解得31-=a …………2分 54,42,5n n n n a n --≤⎧∴=⎨≥⎩(或554,54,62,62,7n n n n n n n a n n --⎧-≤-≤⎧==⎨⎨≥≥⎩⎩). ……………………4分 (2)由(1)得2417,42227,5n n n n n S n -⎧-≤⎪=⎨⎪-≥⎩(或22441717,5,6222227,627,7n n n n n n n n n S n n --⎧⎧-≤-≤⎪⎪==⎨⎨⎪⎪-≥-≥⎩⎩)…………6分 {}2345:3,2,1,0,1,2,2,2,2,2,n a --- ,{}:3,5,6,6,5,3,1,9,25,n S ------ {}:9,10,6,0,5,6,4,72,400,n n a S -- ,可见数列{}n n a S 的最小项为666a S =-,证明:541(4)(7),522(27),6n n n n n n n n a S n --⎧--≤⎪=⎨⎪-≥⎩,列举法知当5n ≤时,min 55()5n n a S a S ==-; …………8分当6n ≥时,)6(27)2(2525≥⋅-⋅=--n S a n n n n ,设52n t -=,则{}22,2,,2,m t ∈ ,222749272()2272648n n a S t t t =-=--≥⋅-⋅=-. ……………………10分(3) {}n a 为“r 关联数列”,且110,1,2a d q =-==11(2)12,11r r a a r d r a r -∴=+-=-=-,1213rr a r a -=∴=2121112111,12,12,222,13256,13n n n n n n n n n a S n n --⎧⎧-≤-≤⎪⎪∴==⎨⎨≥⎪⎪-≥⎩⎩…………………………12分①当12k m <≤时,由221211212222k k m m -=-得(k )(k )21(k )m m m +-=- 21,,12,k m k m m k +=≤>,129m k =⎧∴⎨=⎩或1110m k =⎧⎨=⎩. ②当12m k >>时,由1111256256k m ---=-得m k =,不存在 ………………14分 ③当12,12k m ≤>时,由21112125622m k k --=-,102221112m k k -=-+ 当1k =时,10*292,m m N -=∉;当2k =时,10*274,m m N -=∉; 当3k =时,10*258,m m N -=∉;当4k =时,10*244,m m N -=∉; 当5k =时,105*22,15m m N -==∈;当6k =时,10*222,m m N -=∉; 当7k =时,10*214,m m N -=∉;当8k =时,103*22,13m m N -==∈; 当9k =时,10222,12m m -==舍去;当10k =时,1022,11m m -==舍去当11k =时,1022,11m m -==舍去;当12k =时,10222,12m m -==舍去……16分综上所述,∴存在155m k =⎧⎨=⎩或138m k =⎧⎨=⎩或129m k =⎧⎨=⎩或1110m k =⎧⎨=⎩. …………………18分。
高三_物理_2016昂立三模答案
第 1 页 共 4 页2016年普通高等学校招生全国统一考试上海物理模拟试卷评分标准一.单项选择题(共16分,每小题2分) 1.B 2.A 3.C 4.B 5.A 6.C 7.C 8.B二.单项选择题(共24分,每小题3分) 9.D 10.C 11.C 12.D 13.A 14.B 15.B 16.C三.多项选择题(共16分。
每小题有2个以上正确选项,全部选对的得4分,部分选对的得2分,有选错的得0分) 17.B ,C 18.A ,C ,D 19.B ,C 20.A ,C ,D四.填空题(共20分。
每个空格2分) 21.0.4;5.022A .3:2;1:122B .gR 22324πgR T23.y 轴正;24.ηρ32π21v L P =;2.4⨯10825.()gR 32531-;mgR )32(-五.实验题(共24分)26.(1)⨯1,重新调零(各1分)(2)6.4mA (2分)27.(1)气体密封不严(2分)(2)A ,D (3分。
选对1个得2分,有选错的得0分) 28.(1)A (1分)(2)88,52(各1分)(C )B (3分)29.(1)t h∆∆(1分),20t g ∆⋅+=v v (3分),∆h 和∆t (各1分) (2)∆t ,v (各1分) (3)2k (1分)六.计算题(共50分) 30.(10分)解:设氧气瓶内气体首先由初始状态atm 1300=p ,L 300=V 等温膨胀到atm 101=p ,由玻意耳定律得L 39010301301001=⨯==p V p V (4分)除去氧气瓶中剩余的30L ,有压强为10atm 的氧气360L 可用,再将这些氧气等温膨胀到atm 1=p ,设此时氧气体积为V ,则L 3600136010)30(11=⨯=-=p V p V(4分) 这些氧气可供使用94003600=÷天(2分)31.(12分)解: (1)由牛顿定律a m T g m B B =-(2分) a m g m T A A =-μ(2分)解得g m m m m a BA AB +-=μ(1分) g m m m m T BA BA )1(++=μ(1分)(2)物体C 受力如图,由牛顿定律0A F T N m g μμ'--+=(2分) 0)(C A =-+-T g m m N(2分)解得A B A B A B A C A B ()()(1)()()(1)A m m F m g m m gm m m m g m m gμμμμ++-+'=++++(2分)32.(14分)解:(1)电动机的输入功率24212=⨯==UI P 入W(1分)圆盘的线速度π605.0π260=⨯⨯==R ωv m/s(1分)牵引力N 1.11.62.721=-=-=F F F电动机的输出功率72.20π61.1=⨯==v F P 出W(2分)电动机的效率%35.862472.20%100==⨯=入出P P η(1分)(2)电源的内阻Ω=-=-=4.02128.12I U E r (1分)设电动机线圈的电阻为0R ,则02R I P P =-出入(2分)得Ω=-=-=82.0272.2024220I P P R 出入 (1分)当电动机卡住时,电动机为纯电阻电路 电流表的读数A 5.104.082.08.120A =+=+=r R E I (2分)电压表的读数为6.882.05.100A V =⨯==R I U V(2分)电动机的输入功率为3.905.106.8A V =⨯==I U P W(1分)33.(14分)解:(1)由v -t 图象可知,在0~0.4s 时间内线框做匀加速直线运动,进入磁场时的速度为v 1=2.0m/s ,所以在此过程中的加速度2m/s 0.5=∆∆=ta v(1分)由牛顿第二定律ma mg mg F =--θμθcos sin(1分) 解得 F =1.5 N(1分)(2)由v -t 图象可知,线框进入磁场区域后以速度v 1做匀速直线运动Rl B mg mg F 122cos sin v ++=θμθ(2分) 解得 B =0.50T(1分)(3)由v -t 图象可知,线框进入磁场区域后做匀速直线运动,并以速度v 1匀速穿出磁场,说明线框的宽度等于磁场的宽度L =0.40m 。
2016-2017年上海市七宝中学高三下开学考
第1页七宝中学高三摸底考试数学试卷2017.02一. 填空题1. 不等式11x>的解是 2.已知直线120l y -+=,2:350l x -=,则直线1l 和2l 的夹角为3. 函数3sin 2()2cos 1xf x x -=的最大值是4.i 为虚数单位,1cos 2sin 2z i θθ=-对应的点在第二象限,则θ是第象限的角 5. 已知一组数据47、48、51、54、55,则该组数据的方差是6. 从二项式11(1)x +的展开式中取一项,系数为奇数的概率是7. 命题“对任意[0,]4x π∈,tan x m <恒成立”是假命题,则实数m 取值范围是 8. 函数2()log (43)a f x x x =-+(0,1)a a >≠在[,)x m ∈+∞上存在反函数,则m 的取值范围是9. 若平面向量a 、b 满足||2a =,(2)12a b b +⋅=,则||b 的取值范围为10.已知数列{}n a ,11a =,11()3n n n a a ++=,*n N ∈,则12321lim()n n a a a a -→∞+++⋅⋅⋅+= 11. 已知函数()a f x x x =+(0)a >,若对任意的m 、n 、1[,1]3p ∈,长为()f m 、()f n 、()f p 的三条线段均可以构成三角形,则正实数a 的取值范围是12. 已知数列{}n a 满足:对任意的*n N ∈均有122n n a ka k +=+-,其中k 为不等于0与1的常数,若{272,32,2,8,88,888}i a ∈---,i =2、3、4、5,则满足条件的1a 所有可能值的和为二. 选择题13. 已知实数m 、n ,则“0mn >”是“方程221mx ny +=代表的曲线是椭圆”的()A. 充分非必要条件B. 必要非充要条件C. 充要条件D.既非充分也非必要条件14. 将半径为R 的半圆形铁皮制作成一个无盖圆锥形容器(不计损耗),则其容积为()3R3R3R3R 15. 已知数列{}n a 通项公式为1(1)n a n n =+,其前m 项和为910,则双曲线2211x y m m -=+ 的渐近线方程是() A.910y x =± B. 109y x =±C. y x =D.y x =第2页16. 已知等比数列{}n a 的前n 项和为n S ,则下列一定成立的是()A.若30a >,则20160a >B. 若40a >,则20170a >C. 若30a >,则20170S >D.若40a >,则20160S >三. 解答题17. 如图,用一平面去截球O ,所得截面面积为16π,球心O 到截面的距离为3,1O 为截面小圆圆心,AB 为截面小圆的直径;(1)计算球O 的表面积和体积;(2)若C 是截面小圆上一点,30ABC ︒∠=,M 、N 分别是线段1AO 和1OO 的中点,求异面直线AC 与MN 所成的角;(结果用反三角表示)18. △ABC 中,角A 、B 、C 所对边分别为a 、b 、c ,5cos 13A =,10tan cot 223B B +=, 21c =;(1)求sin C 的值;(2)求△ABC 的面积; 19. 已知函数2()43f x x x a =-++,a R ∈;(1)若函数()y f x =在[1,1]-上存在零点,求a 的取值范围;(2)设函数()52g x bx b =+-,b R ∈,当3a =时,若对任意的1[1,4]x ∈,总存在 2[1,4]x ∈,使得12()()g x f x =,求b 的取值范围;20. 已知抛物线2:2y px Γ=上一点(3,)M m 到焦点的距离为4,动直线y kx =(0)k ≠交 抛物线Γ于坐标原点O 和点A ,交抛物线Γ的准线于点B ,若动点P 满足OP BA =,动 点P 的轨迹C 的方程为(,)0F x y =;(1)求出抛物线Γ的标准方程;(2)求动点P 的轨迹方程(,)0F x y =;(不用指明范围)(3)以下给出曲线C 的四个方面的性质,请你选择其中的三个方面进行研究:①对称性; ②图形范围;③渐近线;④0y >时,写出由(,)0F x y =确定的函数()y f x =的单调区 间,不需证明;21. 已知无穷数列{}n a ,满足21||n n n a a a ++=-,*n N ∈;(1)若11a =,22a =,求数列前10项和;(2)若11a =,2a x =,x Z ∈,且数列{}n a 前2017项中有100项是0,求x 的可能值;(3)求证:在数列{}n a 中,存在*k N ∈,使得01k a ≤<; 参考答案一. 填空题第3页 1. (0,1) 2. 3π 3. 5 4. 一、三 5. 10 6. 237. (,1]-∞ 8. (3,)+∞ 9. [2,6] 10.98 11. 15(,)153 12. 24203二. 选择题13. C 14. A 15. C 16. C三. 解答题17.(1)100S π=,5003V π=;(2)2arccos 5; 18.(1)63sin 65C =;(2)126S =; 19.(1)[8,0]-;(2)1[1,]2-; 20.(1)24y x =;(2)244(1)1y x x =++-;(3)①关于x 轴对称;②(1,)x ∈+∞, (,4][4,)y ∈-∞-+∞;③渐近线1x =;④在(1,2]上递减,在[2,)+∞上递增; 21.(1)9;(2)1141-、1140-、1144、1145;(3)略;。
上海市七校2016届高三3月联合教学调研考试物理试题 含答案
2015学年第二学期高三教学调研(2016。
03)物理试卷本试卷共8页,满分150分,考试时间120分钟。
全卷包括六大题,第一、二大题为单项选择题,第三大题为多项选择题,第四大题为填空题,第五大题为实验题,第六大题为计算题。
考生注意:1、答卷前,务必用钢笔或圆珠笔在答题纸正面清楚地填写姓名、准考证号,并将核对后的条形码贴在指定位置上,在答题纸反面清楚地填写姓名.2、第一、第二大题的作答必须用2B铅笔涂在答题卡上相应区域内与试卷题号对应的位置,需要更改时,必须将原选项用橡皮擦去,重新选择.第三、第四、第五和第六大题的作答必须用黑色的钢笔或圆珠笔写在答题纸上与试卷题号对应的位置(作图可用铅笔)。
3、第30、31、32、33题要求写出必要的文字说明、方程式和重要的演算步骤。
只写出最后答案,而未写出主要演算过程的,不能得分.有关物理量的数值计算问题,答案中必须明确写出数值和单位。
一.单项选择题(共16分,每小题2分。
每小题只有一个正确选项.)1.下列叙述中符合物理学史实的有( )(A)托马斯·杨通过对光的干涉现象的研究,证实了光具有波动性(B)麦克斯韦建立了完整的电磁场理论,并通过实验证实了电磁波的存在(C)查德威克通过对α粒子散射实验的研究,提出了原子的核式结构学说(D)贝克勒尔发现了天然放射现象,并提出原子核是由质子和中子组成的2.在阳光下,竖直放置的肥皂膜上呈现彩色条纹,可以观察到()(A)竖直方向的条纹,是由于不同频率的光各自在肥皂膜前后表面反射叠加的结果(B)竖直方向的条纹,是由于相同频率的光在肥皂膜前后表面反射叠加的结果(C)水平方向的条纹,是由于不同频率的光各自在肥皂膜前后表面反射叠加的结果(D)水平方向的条纹,是由于相同频率的光在肥皂膜前后表面反射叠加的结果3.下列叙述正确的是()(A)外界对物体做功,物体的内能一定增加(B)热量不能由低温物体传递到高温物体(C)温度升高,物体内每个分子的热运动速率都增大(D)自然界中进行的涉及热现象的宏观过程都具有方向性4.分子运动是看不见、摸不着的,其运动特征不容易研究,但科学家可以通过布朗运动认识它,这种方法叫做“转换法”。
上海市闵行区七宝中学2015届高考数学三模试卷理(含解析)
上海市闵行区七宝中学20 15届高考数学三模试卷(理科)一、填空题:(本大题共14小题,每小题4分,满分56分).把答案直接填写在答题卷的相 应位置上.1. (4 分)已知集合 A={0, 1, a} , B={0, 3, 3a},若 A A B={0, 3},则 A U B=.2. (4分)复数i :在复平面内所对应的点在虚轴上,则实数 a=.2-i3. (4分)在等比数列{a n }中,a 1=8, a 4=a 3?a 5,则此数列前n 项和为.F( — y )4. (4分)已知偶函数(乂)在(0,+8)上为减函数,且(2)=0,则不等式一X 的解集为.6. (4分)在极坐标系中,圆 p =2与直线p cos 0 + p sin 0 =2交于A, B 两点,O 为极点,则''=.7. (4分)如图是底面半径为1 ,母线长均为2的圆锥和圆柱的组合体, 则该组合体的体积为.a 的值为5,则输出k 的值为.& (4分)若二项式(x+_J ) n 的展开式中第四项与第六项的二项式系数相等,且第四项的系数|x与第六项的系数之比为1: 4,则其常数项为.9. (4分)某类产品按工艺共分 10个档次,最低档次产品每件利润为 8元•每提2014-2015 学年高一个档次,每件利润增加2元.用同样工时,可以生产最低档产品 60件,每提2014-2015 学年高一个档次将少生产 3件产品.则获得利润最大时生产产品的档次是.10. ( 4分)从甲、乙等五人中任选三人排成一排,则甲不在排头、乙不在排尾的概率为.11. ( 4分)函数f (x ) =Asin (3 x+0)(其中A > 0, | $ | v 丄)的图象如图所示,为了得22 212. (4分)过点(2怎,0)且方向向量为(k , 1)的直线与双曲线卫一=1仅有一个交点,8 4则实数k 的值为.13. ( 4分)某学校随机抽取100名学生调查其上学所需时间(单位:分钟) ,并将所得数据绘 制成频率分布直方图(如图),其中,上学所需时间的范围是 [0 , 100],样本数据分组为[0 ,20), [20 , 40), [40 , 60) , [60 , 80), [80 , 100].则该校学生上学所需时间的均值估计为.(精确到1分钟)f (x )的图象向右最小平移个长度单位.(1 ¥ 匕p14. (4分)已知全集为U P?U定义集合P的特征函数为f ■,对于A?U,迈8 1学^CyPB?U,给出下列四个结论:①对?x € U,有如⑸悅(Q习;lk②对? x € U,若A?B,贝y f A (x )<f B (x);③对?X €U,有f A AB ( x ) =f A ( X) ?f B ( x);④对?X €U,有f A UB ( x) =f A ( x) +f B ( x).其中,正确结论的序号是.二、选择题:(本大题共4小题,每小题5分,满分20分)•每小题所给的四个选项中只有一个是正确的,请将正确答案的选项填在答题卷的相应位置上.15. ( 5分)已知函数f (x) =2x+1,对于任意正数a, |x i - x?| < a 是|f (xj- f (X2) | < a 成立的()A.充分非必要条件B.必要非充分条件C.充要条件D.既不充分也不必要条件16. ( 5分)函数f (x) =3- log 2 (- x)的零点所在区间是()A. ( —2 —2)B. (- 2, - 1)C. (一1,—吕)D. (1, 2)17. ( 5分)如果函数y=|x| - 1的图象与方程x2+入y2=1的曲线恰好有两个不同的公共点,则实数入的取值范围是()A. (-a,- 1] U [0 , 1)B. [ - 1 , 1)C. { - 1 , 0} D .[-1, 0)U( 1 , +a)18. (5分)设等差数列{a n}的前n项和为S,已知(引_]\ *2012 (巧一1)=1 ,J ^2006 - 1)一1)二-1,则下列结论正确的是()A. $012=2012, a2012< a7B. S2012=2012, a2012> a7C. So12=—2012 , a2012 < a7D. S2012= - 2012, a2012> a7三、解答题(本大题满分74分)本大题共有5题,解答下列各题必须写出必要的步骤.每题解题过程写在该题的答题框内,否则不计分.19. (12分)在厶ABC中,角A, B, C的对边分别为a, b, c,且r-=-.(I)求r: _ - t --二「-的值;(n)若“二J丨求△ ABC面积的最大值.20. (13分)已知向量;=(x2- 3, 1 ),E = (x,- y),(其中实数x和y不同时为零),当凶(1) 求函数关系式y=f (x );(2) 若对任意x €(-g,- 2)U [2 , +8),都有m > f ( x )恒成立,求实数 m 的取值范围.21 . (13分)如图所示,在三棱锥P - ABC 中,PDL 平面ABC ,且垂足D 在棱AC 上,AB=BC=:, AD=1, CD=3 PD=*苗.(1) 证明△ PBC 为直角三角形;(2) 求直线AP 与平面PBC 所成角的正弦值.222. ( 18分)已知椭圆x 2+ =1的左、右两个顶点分别为 A , B,曲线C 是以A , B 两点为顶点,4焦距为2 J 的双曲线.设点 P 在第一象限且在曲线 C 上,直线AP 与椭圆相交于另一点 T .(I)求曲线C 的方程;(H) 设P, T 两点的横坐标分别为 X 1, X 2,求证:X 1?X 2为定值;- - 2(川)设厶TAB 与厶POB(其中o 为坐标原点)的面积分别为 S 1与S 2,且「丨■ < 15,求S 1-S 22的取值范围.23. (18 分)实数列 a o , a 1, a 2, a 3,…,由下述等式定义: a n+1 =2n -3a n , n=0, 1, 2,3,…(I) 若a °为常数,求a 1, a 2, a 3的值;(2)令b n = … ,求数列{b n } (n € N)的通项公式(用 a 。
七宝中学高三上期中(含答案解析版)
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8.已知 a 0 , b 0 且 a b 1 ,则 ( a 2) (b 2) 的最小值是___________.
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9.已知偶函数 f ( x ) 对任意 x R 都有 f ( x 4) f ( x) 2 f (2) ,则 f (2018) 的值等于 _________ 0
(A)
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(B)
2
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(D 2
16..已知 y f ( x ) 是周期为 2 的函数,当 x 0,2 时,f(x)=sin 解集为( D )
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5 ,k∈Z} (B){xx=2k + ,k∈Z} 3 3 k (C){xx=2k +(-1) ,k∈Z}( D ){xx=2k ± ,k∈Z} 3 3 1 1 17“ x ”是“不等式 x 1 1 成立”的 ( A 3 2
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6分
(2)依题意, F ( x ) a sin x cos 2 x =-2sin 2 x a sin x 1 。 研究函数 F ( x) 在 (0, 2 ] 上的零点情况。 设 t sin x , p(t ) -2t 2 at 1 (1 x 1) ,则函数 p(t ) 是开口向下的抛物线, 又 p(0) 1 >0, p(1) a 1 , p(1) a 1 。 当 a 1 时,函数 p(t ) 有一个零点 t1 ( 1, 0) ,另一个零点 t2 1 ,舍去。
高三_物理_2016昂立三模试卷
第 1 页 共 4 页上海 物理试卷本试卷共8页,满分150分,考试时间120分钟。
全卷包括六大题,第一、第二大题为单项选择题,第三大题为多项选择题,第四大题为填空题,第五大题为实验题,第六大题为计算题。
考生注意:1、答卷前,务必用钢笔或圆珠笔在答题纸正面清楚地填写姓名、准考证号,并将核对后的条形码贴在指定位置上,在答题纸反面清楚地填写姓名。
2、第一、第二和第三大题的作答必须用2B 铅笔涂在答题纸上相应区域内与试卷题号对应的位置,需要更改时,必须将原选项用橡皮擦去,重新选择。
第四、第五和第六大题的作答必须用黑色的钢笔或圆珠笔写在答题纸上与试卷题号对应的位置(作图可用铅笔)。
3、第30、31、32、33题要求写出必要的文字说明、方程式和重要的演算步骤。
只写出最后答案,而未写出主要演算过程的,不能得分。
有关物理量的数值计算问题,答案中必须明确写出数值和单位。
一.单项选择题(共16分,每小题2分。
每小题只有一个正确选项。
) 1.激光防伪标志的彩色图样是利用了(A )光的色散现象 (B )光的干涉现象 (C )光电效应现象(D )光的衍射现象2.卢瑟福通过α粒子散射实验,判断出原子的中心有一个很小的核,并由此提出了原子的核式结构模型。
如图所示的平面示意图中,①、②两条线表示某两个α粒子运动的轨迹,则沿轨迹③射向原子核的α粒子经过原子核后可能的运动轨迹为(A )轨迹a (B )轨迹b (C )轨迹c(D )轨迹d3.一放射性元素的原子核,发生了2次α衰变和6次β衰变,则该原子核的中子数和核子数分别减少了 (A )8个和6个(B )8个和4个 (C )10个和8个(D )10个和4个4.光可以产生干涉、衍射等现象及光电效应,其中 (A )光的干涉现象说明光是一种电磁波 (B )光的衍射现象说明光具有波动性 (C )光电效应现象说明光是一种机械波 (D )光电效应现象说明光具有波粒二象性5.汽车在以不同速度行驶时所受阻力与速度平方的关系如图,研究表明,汽车行驶时除空气阻力外所受到的其它阻力与汽车速度基本无关,则这些阻力的大小为(A )125牛顿 (B )250牛顿 (C )305牛顿(D )375牛顿6.一质点作简谐振动,已知振动频率为f ,则振动动能的变化频率是(A )f /2(B )f(C )2f(D )4f7.如图,一车西瓜随汽车一起沿水平路面向右做匀加速直线运动,汽车所受阻力是车重的k 倍,加速度大小为a ,车中质量为m 的西瓜受到的其它西瓜的作用力的合力大小为 (A )ma(B )21m k + (C )22m g a +(D )m (g +a )8.一足够长的铜管竖直放置,将一截面大小与铜管的内截面相同,质量为的永久磁铁块由管上端放入管内,不考虑磁铁与铜管间的摩擦,磁铁的运动速度 (A )越来越大(B )逐渐增大到一定值后保持不变(C )逐渐增大到一定值时又开始减小,到一定值后保持不变(D )逐渐增大到一定值时又开始减小到一定值,之后在一定区间变动二.单项选择题(共24分,每小题3分。
上海七宝第三中学高中物理选修三第一章《分子动理论》测试(包含答案解析)
一、选择题1.(0分)[ID:129747]如图所示为两分子系统的势能p E与两分子间距离r的关系曲线,下列说法中正确的是()A.当r大于r1时,分子间的作用力表现为引力B.当r小于r1时,分子间的作用力表现为斥力C.当r等于r1时,分子间的作用力为零D.当r由r1变到r2的过程中,分子间的作用力做负功2.(0分)[ID:129744]如图是氧气分子在不同温度下的速率分布规律图横坐标表示速率,纵坐标表示某一速率内的分子数占总分子数的百比由图可知()A.同一温度下氧气分子呈现“中间多,两头少”的分布规律B.随着温度的升高每一个氧气分子的速率都增大C.随着温度的升高,氧气分子中速率小的分子所占的比例增大D.①状态的温度比②状态的温度高3.(0分)[ID:129738]如图所示,甲分子固定在坐标原点O,乙分子位于r轴上,甲分子对乙分子的作用力与两分子间距离的关系如图中曲线所示,F>0为斥力,F<0为引力,a、b、c、d为r轴上四个特定的位置。
现把乙分子从a处静止释放,则()A.乙分子从a到b做加速运动,由b到c做减速运动B.乙分子从a到c做匀加速运动,到达c时速度最大C.乙分子在由a至d的过程中,两分子的分子势能一直增加D.乙分子在由a至c的过程中,两分子的分子势能一直减小,到达c时分子势能最小4.(0分)[ID:129737]下列关于布朗运动的说法,正确的是( )A.布朗运动是液体分子的无规则运动B.液体温度越高,悬浮粒子越大,布朗运动越剧烈C .布朗运动是由于液体各部分的温度不同而引起的D .布朗运动是由液体分子从各个方向对悬浮粒子撞击作用的不平衡引起的5.(0分)[ID :129731]在国际单位制中,阿伏加德罗常数是N A ,铜的摩尔质量是μ,密度是ρ,则下列说法正确的是( ) A .一个铜原子的质量为AN μB .一个铜原子所占的体积为μρC .1m 3铜中所含的原子数为AN μD .m kg 铜所含有的原子数为m N A6.(0分)[ID :129727]下列关于布朗运动的说法中正确的是( ) A .布朗运动是指在显微镜下观察到的悬浮固体颗粒的无规则运动 B .布朗运动是指在显微镜下直接观察到的液体分子的无规则运动 C .布朗运动是指液体分子的无规则运动D .布朗运动是指在显微镜下观察到的组成悬浮颗粒的固体分子的无规则运动7.(0分)[ID :129718]已知铜的摩尔质量为M ,密度为ρ,阿伏加德罗常数为N ,下列说法中正确的是( ) A .1个铜原子的质量为M NB .1个铜原子的质量为N MC .1个铜原子所占的体积为MNN D .1个铜原子所占的体积为ρM N8.(0分)[ID :129716]下列关于分子间相互作用表述正确的是( ) A .水的体积很难压缩,这是因为分子间没有间隙的表现 B .气体总是很容易充满容器,这是因为分子间有斥力的表现 C .用力拉铁棒很难拉断,这是因为分子间有引力的表现 D .压缩气体时需要用力,这是因为分子间有斥力的表现 9.(0分)[ID :129692]下列说法中正确的是( ) A .布朗运动越显著,说明悬浮在液体中的微粒质量越小B .将红墨水滴入一杯清水中,水的温度越高整杯清水都变成红色的时间越短C .将体积相同的水和酒精混在一起,发现总体积小于混合前水和酒精的体积之和,说明分子间存在引力D .向气球内吹气,气球的体积变大,这是气体分子间有斥力的缘故 10.(0分)[ID :129687]以下说法正确的是 ( )A .无论什么物质,只要它们的摩尔数相同就含有相同的分子数B .分子引力不等于分子斥力时,违背了牛顿第三定律C .lg 氢气和1g 氧气含有的分子数相同,都是6.02×1023个D .阳光从缝隙射入教室,从阳光中看到的尘埃的运动就是布郎运动11.(0分)[ID :129654]两个临近的分子之间同时存在着引力和斥力,引力和斥力的大小随分子间距离变化的关系如图中虚线所示,分子间作用力的合力与分子间距离的关系如图中实线所示。
上海七宝第三中学中考化学三模试卷解析版
上海七宝第三中学中考化学三模试卷解析版一、选择题(培优题较难)1.将一定质量的氧化铜粉末加入到100g 质量分数为14%的硫酸溶液中,微热至氧化铜全部溶解,再向蓝色溶液屮加入Wg 铁粉,充分反应后,过滤、烘干,得到干燥的固体混合物仍是Wg 。
下列说法不正确的是A .W 的取值范围是W≥8gB .加入氧化铜的质量是10gC .最后得到溶液溶质质量分数约是19.7%D .产生气体的质量为0.07g【答案】D【解析】解法一:设原先氧化铜的质量为m ,则与氧化铜反应的硫酸的质量x ,生成硫酸铜的质量y 。
CuO+H 2SO 4═CuSO 4+H 2O80 98 160m x y 8098160m x y== x=9880m y=2m 设加入铁粉与硫酸铜溶液充分反应固体增加的质量为a ;与剩余稀硫酸反应的铁的质量为b ,同时放出氢气质量为c 。
Fe+CuSO 4═FeSO 4+Cu 固体质量增加56 160 64 64-56=82m a16082m a= a=0.1mFe+H 2SO 4═FeSO 4+H 2↑56 98 2 b 14g-9880m c 56982981480m b c g ==-b=8-0.7m反应前后固体质量不变,即与硫酸反应消耗铁的质量等于与硫酸铜反应固体增加的质量,即:a=b ,0.1m=8-0.7m ,解得m=10g ,b=1g 。
562b c=,由于b=1g ,所以有:5621g c = c≈0.04g由题意可知,硫酸最终全部转化为硫酸亚铁,设硫酸亚铁的质量为z 。
H 2SO 4 ~FeSO 498 152100g×14% z981520100140z g =⨯ Z=1527g 加入铁粉的质量W=1527g ×56152×100%=8g ; 最后得到溶液的质量分数=21.7100100.04g g g g+-×100%≈19.73% 故选D 。
上海市七宝中学2015-2016学年高一下学期Exercise3 含答案
I。
Grammar(A)One night I decided to spend some time building a happier and closer relationship with my daughter。
As she [1]__________ (ask)me to play chess with her, I suggested a game and she eagerly accepted. It was a school night, however,and at nine o'clock my daughter asked if I [2]__________ hurry my moves,because she needed to go to bed; she had to get up at six in the morning. I knew she had strict sleeping habits,[3]__________ I thought she ought to be able to give up some of this strictness。
I said to her, “What fun it is!Why not stay up late for once. ” We played on for [4]__________ fifteen minutes, during which time she looked anxious。
Finally she said,“Please, Daddy,do it quickly.” “No,” I replied。
“[5]_________ you want to play it well, you’re going to play it slowly。
” And so we continued until suddenly my daughter burst into tears,and admitted [6]__________ (beat).Clearly,I had made a mistake。
0206-七宝中学高三三模(2020.6)
七宝中学高三三模数学试卷2020.6一、填空题1.已知集合{|2,}A x x k k ==∈Z ,{|22}B x x =-≤≤,则A B = .2.若直线方程0ax by c ++=的一个法向量为1)-,则此直线的倾斜角为 .3.已知复数z 满足i 1i z ⋅=+(i 是虚数单位),则复数z 的虚部Im()z = .4.已知a 、b 、c 是任意实数,能够说明“若a b c >>,则a b c +>”是假命题的一个有序整数组(,,)a b c 可以是 .5.函数|2i |y x =+(x ∈R ,i 是虚数单位)的图像与直线y a =有且仅有一个交点,则实数a = .6.直角坐标系xOy 内有点(2,1)A ,(2,2)B ,(0,2)C ,(0,1)D ,将四边形ABCD 绕直线1y =旋转一周,所得到几何体的体积为 .7.在A BC △中,60ABC ∠=︒,22BC AB ==,E 为AC 的中点,则A B BE ⋅= .8.通过手机验证码登录哈喽单车App ,验证码由四位数字随机组成.如某人收到的验证码 1234(,,,)a a a a 满足1234a a a a <<<,则称该验证码为递增型验证码.某人收到一个验证码,那么是首位为2的递增型验证码的概率为 .9.已知函数1()()(1)2x x f x a a a -=->的反函数为1()y f x -=,当[3,5]x ∈-时,函数 ()F x =1(1)1f x --+的最大值为M ,最小值为m ,则M m += .10.欧拉公式i cos isin e θθθ=+,它将指数函数的定义域扩大到复数,建立了三角函数 和指数函数的联系,被誉为“数学中的天桥”.已知数列{}n a 的通项公式为cos isin (1,2,3,)20202020n n n a n ππ=+=⋅⋅⋅,则数列{}n a 前2020项的乘积为 . 11.用I M 表示函数sin y x =在闭区间I 上的最大值,若正数a 满足[0,][,2]2a a a M M ≥,则a 的最大值为 .12.已知数列{}n a 的首项为4,且满足*12(1)0()n n n a na n ++-=∈N ,则下列命题: ①{}n a n是等差数列;②{}n a 是递增数列;③设函数211()()2x n n a f x x a -+=--,则存在某个区 间*)()(,1n n n +∈N ,使得()f x 在(,1)n n +上有唯一零点.则其中正确的命题序号为 .二、选择题13.设a 、b 分别是直线a 、b 的方向向量,则“a b ∥”是“a b ∥”的( )A .充分非必要条件B .必要非充分条件C .充要条件D .既非充分又非必要条件14.某学校有2500名学生,其中高一600人,高二800人,高三1100人.为了了解学生的身体健康状况,采用分层抽样的方法,若从本校学生中抽取100人,从高一和高二抽取样本本数分别为a 、b ,且直线480ax by ++=与以(1,1)A -为圆心的圆交于B 、C 两点,且120BAC ∠=︒,则圆C 的方程为( )A .22(1)(1)1x y -++=B .22(1)(1)9x y -++=C .22(1)(1)4x y -++=D .22(1)(1)3x y -++=15.函数2cos(2)26y x π=+-的图像按向量a 平移后所得图像的函数解析式为()y f x =,当函数()f x 为奇函数时,向量a 可以等于( )A .(,26)π-B .(),26π-C .(212,)π-D .()212,π- 16.已知F 为抛物线24y x =的焦点,A 、B 、C 为抛物线上三点,当0FA FB FC ++=时,则存在横坐标2x >的点A 、B 、C 有( )A .0个B .2个C .有限个,但多于2个D .无限多个三、解答题17.如图,四棱柱1111A BCD A B C D -的底面ABCD 是正方形,O 为底面中心,1A O ⊥平面ABCD ,12A B A A ==.(1)证明:1A C BD ⊥;(2)求直线AC 与平面11BB D D 所成的角θ的大小.18.设a 、b 、c 分别是A BC △内角A 、B 、C 所对的边,12sin sin cos()2B C B C --=. (1)求角A 的大小;(2)若a =A BC △,求A BC △的周长.19.受疫情影响,某电器厂生产的空调滞销.经研究决定,在已有线下门店销售的基础上,成立线上营销团队,大力发展“网红”经济.当线下销售人数为a (人)时,每天线下销售空调可达()10m a a =(百台).当线上销售人数为b (人)时,每天线上销量达到2020()40,0,20b b n b b ⎧=⎨>⎩≤≤(百台). (1)解不等式:()()m a n a <,并解释其实际意义;(2)若该工厂共有销售人员*()t t ∈N 人,按市场需求,安排人员进行线上或线下销售.问该工厂每天销售空调总台数的最大值是多少百台?20.已知椭圆2222:1(0)x y C a b a b+=>>的两焦点为1(F ,2F ,且椭圆上一点P ,满足12||||4PF PF +=.直线:l y kx m =+与椭圆C 交于A 、B 两点,与x 轴、y 轴分别交于点G 、H ,且OA OB OM λ+=.(1)求椭圆C 的方程;(2)若k ||2A B λ==,求||||H G H M ⋅的值;(3)当△OAB 面积取得最大值,且点M 在椭圆C 上时,求λ的值.21.已知数列1210,,,a a a ⋅⋅⋅满足:对任意{1,2,3,,10}i j ∈、,若i j ≠,则i j a a ≠,且23456789110{2,2,2,2,2,2,2,2,2,2}i a ∈.设12,{}|1,2,34,5,6,7,8i i i A a a a i ++++==,集合A 中元素的最小值记为()m A ;集合12{|1,2,3,4,5,6,7,8}i i i B a a a i ++⋅=⋅=,集合B 中元素的最小值记为()m B .(1)对于数列:106127839542,2,2,2,2,2,2,2,2,2,求()m A ,()m B ;(2)求证:17()2m B ≤;(3)求()m A 的最大值.参考答案一、填空题1.{2,0,2}- 2.3π 3.1- 4.(1,2,3)---(答案不唯一) 5.2 6.2π 7.1- 8.72000 9.2 10.i 11.1312π 12.②③二、选择题13.A 14.C 15.B16.A三、解答题(见标答)。
【单元练】上海七宝第二中学高中物理选修3第一章【分子动理论】经典测试卷(培优提高)
一、选择题1.如图所示,活塞质量为m ,缸套质量为M ,通过弹簧吊放在地上,汽缸内封住一定质量的空气,缸套与活塞无摩擦,活塞截面积为S ,大气压强为p 0,则( )A .汽缸内空气的压强等于0p mgS-B .内、外空气对缸套的作用力为(M +m )gC .内、外空气对活塞的作用力为mgD .弹簧对活塞的作用力为(M +m )g D 解析:DA .以缸套为研究对象,根据平衡条件可知0p S Mg pS +=汽缸内气体压强为0Mgp p S=+A 错误;BC .缸套受力平衡,所以内、外空气对缸套的作用力与缸套的重力等大反向,大小为Mg ,则内、外空气对活塞的作用力为Mg ,BC 错误;D .将活塞和缸套作为系统整体受力分析可知,弹簧的弹力与系统的重力相等,即弹簧对活塞的作用力大小为()M m g +,D 正确。
故选D 。
2.在国际单位制中,阿伏加德罗常数是N A ,铜的摩尔质量是μ,密度是ρ,则下列说法正确的是( ) A .一个铜原子的质量为AN μ B .一个铜原子所占的体积为μρC .1m 3铜中所含的原子数为AN μD .m kg 铜所含有的原子数为m N A A解析:AA .铜的摩尔质量是μ,故一个铜原子的质量为Am N μ=故A 正确;BC .1m 3铜的质量为ρkg ,物质的量为ρμ,故原子的个数为 A N N ρμ=⨯ 1m 3铜中所含的原子数为AN ρμ,故一个铜原子所占的体积为 A A 1N N μρρμ=故BC 错误;D .m kg 铜的物质的量为mμ,故含有的原子数目为AA mN mN μμ⨯=故D 错误。
故选A 。
3.若以M 表示水的摩尔质量,V 表示在标准状态下水蒸气的摩尔体积,ρ为在标准状况下水蒸气的质量密度,N A 为阿伏加德罗常数,m 、V 0分别表示每个水分子的质量和体积,下面是四个关系式:其中( )①A V N mρ= ②A N M ρ= ③A M m N = ④ 0A V V N = A .①和②都是正确的 B .①和③都是正确的 C .③和④都是正确的 D .①和④都是正确的B 解析:B摩尔质量等于分子质量乘以阿伏伽德罗常数,也等于等于摩尔体积乘以密度,即A mN V ρ=变形后可得A V N mρ=故①正确;气体的摩尔质量等于摩尔体积乘以密度,所以V M ρ=所以M Vρ=故②错误;摩尔质量=分子质量⨯阿伏伽德罗常数,即AM m N =故③正确;④由于气体分子间距远大于分子直径,因此0AV V N <故④错误。
上海市七宝中学2016年高三模拟考试数学(理)试题 含答案
一、选择题(本大题满分56分)1。
函数0.5log y x =的定义域为______________。
2。
已知{}2,M y y x x R ==∈,{}222,,N x xy x y R=+=∈,则MN =3。
在41(1)(1)x x++的展开式中2x 项的系数为______________.4。
已知地球的半径为R ,在北纬045东经030有一座城市A ,在北纬045西经060有一座城市B ,则坐飞机从城市A 飞到B 的最短距离是______________。
(飞机的飞行高度忽略不计)5.已知一随机变量ξ的分布列如下表,则随机变量ξ的方差D ξ=______________.ξ48()P ξ141412(2,),(2,)2A B π,C 为曲线2cos ρθ=的对称中心,则三角形ABC 面积等于________.7。
高三(1)班班委会由4名男生和3名女生组成,现从中任选3人参加上海市某社区敬老服务工作,则选出的人中至少有一名女生的概率是______________.(结果用最简分数表示) 8。
在复数范围内,若方程22012690xx ++=的一个根为α,则α=______________。
9。
将3()1f x =sin cos xx的图象按(,0)(0)n a a =->平移,所得图象对应的函数为偶函数,则a 的最小值为______________.10。
已知()y f x =是定义在R 上的增函数,且()y f x =的图象关于点(6,0)对称,若实数,x y 满足不等式22(6)(836)0f xx f y y -+-+≤,则22x y +的取值范围是______________。
11.函数()f x 对任意12,[,]x xm n ∈都有1212()()f x f x x x -≤-,则称()f x 为在区间[,]m n 上的可控函数,区间[,]m n 称为函数()f x 的“可控"区间,写出函数2()21f x x x =++的一个“可控”区间是______________。
上海市七宝中学2023届高三三模数学试题(1)
一、单选题二、多选题1. 某军事训练模拟软件设定敌机的耐久度为100%,当耐久度降到0%及以下,就判定敌机被击落.对空导弹的威力描述如下:命中机头扣除敌机100%耐久度,命中其他部位扣除敌机60%耐久度.假设训练者使用对空导弹攻击敌人,其命中非机头部位的命中率为50%,命中机头部位的命中率为25%,未命中的概率为25%,则训练者恰能在发出第二发对空导弹之后成功击落敌机的概率为( )A.B.C.D.2.设是椭圆的左,右焦点,过的直接l 交椭圆于A ,B 两点,则的最大值为( )A .14B .13C .12D .103.的值为A .1B.C.D.4. 若集合,,则( )A.B.C.D.5. 根据下表中数据求得的线性回归方程是,则( )x 456789y 908483807568A .98B .107C .110D .1066. 设集合,,则A.B.C.D.7. 在中,已知,,,则等于( )A .1B.C.D.8. 设m ,n 是两条不同的直线,α,β,γ是三个不同的平面.有下列四个命题:①若,,则;②若,,则m ;③若,,,则;④若,,,则.其中正确命题的序号是( )A .①③B .①②C .③④D .②③9. 关于函数的图象与性质,下列说法正确的是( )A.是函数图象的一条对称轴B .是函数图象的一个对称中心C.将函数的图象向右平移个单位长度可得到函数的图象D .当时,10. 设定义在上的函数与的导函数分别为和,若,,且为奇函数,,则( )A.B.上海市七宝中学2023届高三三模数学试题(1)上海市七宝中学2023届高三三模数学试题(1)三、填空题四、解答题C.D.11. 已知锐角三角形的两内角,满足,则( )A.B.C.D.12. 已知正方形ABCD 的边长为4,点E 在线段AB 上,.沿DE 将折起,使点A 翻折至平面BCDE 外的点P ,则( )A .存在点P,使得B .存在点P ,使得直线平面PDE C .不存在点P,使得D .不存在点P ,使得四棱锥的体积为813.已知圆锥的母线长与底面圆的直径均为.现有一个半径为1的小球在内可向各个方向自由移动,则圆锥内壁上(含底面)小球能接触到的区域面积为______.14. 已知正四棱台内接于半径为1的球,且球心是四边形的中心,若该棱台的侧棱与底面所成的角是60°,则该棱台的体积为___________.15. 过点的直线,截圆所得弦长为,则直线的方程为______.16. 全国文明城市是中国所有城市品牌中含金量最高、创建难度最大的一个,是反映城市整体文明水平的综合性荣誉称号,是目前国内城市综合类评比中的最高荣誉,也是最具价值的城市品牌,作为普通市民,既是城市文明的最大受益者,更是文明城市的主要创造者,皖北某市为提高市民对文明城市创建的认识,举办了“创建文明城市”知识竞赛,从所有答卷中随机抽取400份试卷作为样本,将样本的成绩(满分100分,成绩均为不低于40分的整数)分成六段:后得到如图所示的频率分布直方图.(Ⅰ)求样本的平均数;(Ⅱ)现从该样本成绩在与两个分数段内的市民中按分层抽样选取6人,求从这6人中随机选取2人,且2人的竞赛成绩之差的绝对值大于20的概率.17. 矩形ATCD中,,B 为TC 的中点,沿AB 翻折,使得点T 到达点P 的位置,连结PD,得到如图所示的四棱锥,M 为PD的中点.(1)求线段的长度;(2)求直线与平面所成角的正弦值的最大值.18. 如图是某市2016年至2022年农村居民人均可支配收入(单位:万元)的折线图.(1)根据图表的折线图数据,计算与的相关系数,并判断与是否具有较高的线性相关程度(若,则线性相关程度一般,若,则线性相关程度较高,精确到0.01);(2)是否可以用线性回归模型拟合与的关系,若可以用线性回归模型拟合与的关系,求出关于的回归方程(系数精确到0.01),并预测到哪年该市农村居民人均可支配收入超过2万元,若不可以用线性回归模型拟合与的关系,请说明理由.(参考数据:参考公式:相关系数在回归方程中,斜率和截距最小二乘估计公式分别为:)19. 已知函数.(1)求最小正周期及对称中心;(2)在锐角中,a,b,c分别为角A,B,C的对边,且,,求面积的取值范围.20.已知双曲线C:(,)的焦距为,离心率.(1)求双曲线C的方程;(2)设P,Q为双曲线C上异于点的两动点,记直线MP,MQ的斜率分别为,,若,求证:直线PQ过定点.21. 如图,在四棱锥中,平面,四边形是矩形,点是的中点,.(1)证明:平面;(2)求点到平面的距离.。
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上海市高考最后冲刺模拟卷(一)数学理2016.5.18一、填空题(本大题满分56分) 1.函数y =(]0,1。
2.已知}R x x y y M ∈==,2,{}R y x y x x N ∈=+=,,222,则=N M []2,0。
3.在411)(1)x x++(的展开式中2x 项的系数为 10 . 4.已知地球的半径为R ,在北纬45︒东经30︒有一座城市A ,在北纬45︒西经60︒有一座城市B , 则坐飞机从城市A 飞到B 的最短距离是3R π.(飞机的飞行高度忽略不计)5.已知一随机变量的分布列如下表,则随机变量的方差D ξ=11.ξ6.在极坐标系中,点(2 ) (2 )2A B π,,,,C 为曲线2cos ρθ=的对称中心,则三角形ABC 面积 等于3.7.高三(1)班班委会由4名男生和3名女生组成,现从中任选3人参加上海市某社区敬老服务工作, 则选出的人中至少有一名女生的概率是.(结果用最简分数表示)31358.在复数范围内,若方程22012690x x ++=的一个根为α,则α=10069.将sin ()cos xf x x=的图像按( 0)(0)n a a =-> ,平移,所得图像对应的函数为偶函数,则a 的最小值为.π6510.已知)(x f y =是定义在R 上的增函数,且()y f x =的图像关于点(6,0)对称.若实数y x ,满足不等式 22(6)(836)0f x x f y y -+-+≤,则22y x +的取值范围是[16,36].11.函数)(x f 对任意[]n m x x ,,21∈都有2121)()(x x x f x f -≤-,则称)(x f 为在区间[]n m ,上的可控函数,区间[]n m ,称为函数)(x f 的“可控”区间,写出函数12)(2++=x x x f 的一个“可控”区间是(⎥⎦⎤⎢⎣⎡-0,21的子集都可以) 12.椭圆()01342222>=+a ay a x 的左焦点为F ,直线x m =与椭圆相交于点A 、B ,当FAB ∆的周长 最大时,FAB ∆的面积是____________23a .13.用符号(]x 表示小于x 的最大整数,如(]3( 1.2]2π=-=-,,有下列命题:①若函数()(] f x x x x R =-∈,,则()f x 的值域为[1 0)-,;②若(1 4)x ∈,,则方程1(]5x x -=有三个根;③若数列{}n a 是等差数列,则数列{(]}n a 也是等差数列;④若57 { 3 }32x y ∈,,,,则(](]2x y ⋅=的概率ξξ为29P =.则所有正确命题的序号是①②④. 14. 设()cos 2()cx f x ax bx x R =++∈, a b c R ∈,,且为常数。
若存在一公差大于0的等差数列{}()n x n N *∈,使得{()}n f x 为一公比大于1的等比数列,请写出满足条件的一组 a b c ,,的值 (答案不唯一,一组即可). 二、选择题:(本大题满分20分)15.若直线l 的一个法向量(3 1)n =,,则直线l 的一个方向向量d 和倾斜角α分别为( )DA.(1 3)arctan3d α== ,;B.(1 3)arctan(3)d α=-=- ,;C.(1 3)arctan3d απ==- ,;D.(1 3)arctan3d απ=-=- ,;16.在△ABC 中,“cos cos cos 0A B C ⋅⋅<”是“△ABC 为钝角三角形”的( )AA.充分必要条件B.必要不充分条件C.充分不必要条件D.既不充分又不必要条件17.定义域是一切实数的函数()x f y =,其图像是连续不断的,且存在常数λ(R λ∈)使得()()0f x f x λλ++=对任意实数x 都成立,则称()f x 是一个“λ—伴随函数”. 有下列关于“λ—伴随函数”的结论:①()0f x =是常数函数中唯一一个“λ—伴随函数”;②“12—伴随函数”至少有一个零点.;③2()f x x =是一个“λ—伴随函数”;其中正确结论的个数是 ()AA.1个B.2个C.3个D.0个18.已知数据123 n x x x x ,,,,是上海普通职工n *(3 )n n N ≥∈,个人的年收入,设这n 个数据的中位数为x ,平均数为y ,方差为z ,如果再加上世界首富的年收入1n x +,则这1n +个数据中,下列说法正确的是( )BA.年收入平均数大大增大,中位数一定变大,方差可能不变B.年收入平均数大大增大,中位数可能不变,方差变大C.年收入平均数大大增大,中位数可能不变,方差也不变D.年收入平均数可能不变,中位数可能不变,方差可能不变。
三. 解答题(本大题满分74分)本大题共有5题,解答下列各题必须在答题纸相应编号的规定区域内写出必要的步骤:19.(本题满分12分,其中第1小题6分,第2小题6分) 在直三棱柱111C B A ABC -中,1==AC AB ,090=∠BAC ,且异面直线B A 1与11C B 所成的角等于060,设a AA =1. (1)求a 的值;(2)求直线11B C 到平面1A BC 的距离。
解:(1) 11//C B BC ,∴BC A 1∠就是异面直线B A 1与11C B 所成的角,即160A BC ∠= ,……(2又连接C A 1,AC AB =,则C A B A 11=∴BC A 1∆为等边三角形, ………………(4分)由1==AC AB ,90BAC ∠=2=⇒BC ,∴121221=⇒=+⇒=a a B A 。
…………(6分)(2)易知//11C B 平面BC A 1,又D 是11C B 上的任意一点,所以点D 到平面BC A 1的距离等于点1B 到平面BC A 1的距离.…(8分)设其为d ,连接C B 1,则由三棱锥BC A B 11-的体积等于三棱锥B B A C 11-的体积,求d ,B B A 11∆的面积21=S ,BC A 1∆的面积23)2(432=⋅='S ,………(10分)又⊥∴⊥⊥CA AB CA A A CA ,,1平面C B A 11,所以333131=⇒⋅'⋅=⋅⋅d d S AC S ,即11B C 到平面BC A 1的距离等于33。
…(12分) 20.(本题满分14分,其中第1小题6分,第2小题8分)某海域有A 、B 两个岛屿,B 岛在A 岛正东4海里处。
经多年观察研究发现,某种鱼群洄游的路线是曲线C ,曾有渔船在距A 岛、B 岛距离和为8海里处发现过鱼群。
以A 、B 所在直线为x 轴,AB 的垂直平分线为y 轴建立平面直角坐标系。
(1)求曲线C 的标准方程;(2)某日,研究人员在A 、B 两岛同时用声纳探测仪发出不同频率的探测信号(传播速度相同),A 、B 两岛收到鱼群在P 处反射信号的时间比为3:5,问你能否确定P 处的位置(即点P 的坐标)?解(1)由题意知曲线C 是以A 、B 为焦点且长轴长为8的椭圆又42=c ,则4,2==a c ,故32=b ,所以曲线C 的方程是1121622=+y x (2)由于A 、B 两岛收到鱼群发射信号的时间比为3:5,因此设此时距A 、B 两岛的距离分别比为3:5 即鱼群分别距A 、B 两岛的距离为5海里和3海里。
设),(y x P ,)0,2(B ,由3=PB ∴3)2(22=+-y x ,()⎪⎪⎩⎪⎪⎨⎧≤≤-=+=+-4411216922222x y xy x ,解得3,2±==y x ,∴点P 的坐标为()3,2或()3,2- 21.(本题满分14分,其中第1小题7分,第2小题7分) 设函数),,()(R c b N n c bx x x f n n ∈∈++=*.(1)设1,1,2-==≥c b n ,证明:)(x f n 在区间)1,21(内存在唯一的零点; (2)设2=n ,若对任意[]1,1,21-∈x x ,有4)()(2212≤-x f x f ,求b 的取值范围.解:(1)证明:因为n 1()<02f ,n (1)>0f 。
所以n 1()2f ⋅n (1)<0f 。
所以n (x)f 在1(1)2,内存在零点。
12121212121x (,1),x <(x )-f (x )=(x -)+(x -x )<02n n n n x x f x ∈任取、且,则,所以n (x)f 在1(1)2,内单调递增,所以n (x)f 在1(1)2,内存在唯一零点。
(2)当n =2时,f 2(x)=x 2+bx +c.对任意x 1,x 2∈[-1,1]都有|f 2(x 1)-f 2(x 2)|≤4等价于f 2(x )在[-1,1]上的最大值与最小值之差M ≤4, 据此分类讨论如下:①当||12b >,即|b |>2时,M =|f 2(1)-f 2(-1)|=2|b |>4,与题设矛盾。
②当-1≤2b -<0,即0<b ≤2时,M =f 2(1)-f 2(2b -)=(2b +1)2≤4恒成立. ③当0≤2b -≤1,即-2≤b ≤0时,M =f 2(-1)-f 2(2b -)=(2b -1)2≤4恒成立.综上可知,-2≤b ≤2.注:②,③也可合并证明如下:用max{a ,b }表示a ,b 中的较大者.xBAyO∙∙当-1≤2b -≤1,即-2≤b ≤2时,M =max{f 2(1),f 2(-1)}-f 2(2b -) =22222(1)(1)|(1)(1)|()222f f f f b f -+--+--=1+c +|b |-(24b -+c )=(1+||2b )2≤4恒成立.22.(本题满分16分,其中第1小题4分,第2小题6分,第3小题6分,)一青蛙从点000(,)A x y 开始依次水平向右和竖直向上跳动,其落点坐标依次是( )()i i i A x y i N *∈,,(如图所示,000( )A x y ,坐标以已知条件为准),n S(1) 若点000( )A x y ,为抛物线22y px =(0)p >一点,点1A ,2A 均在该抛物线上,并且直线1A 2A 经过该抛物线的焦点,证明23S p =.(2)若点( )n n n A x y ,要么落在y x =所表示的曲线上,要么落在2y x =所表示的曲线上,并且011( )22A ,, 试写出lim n n S →+∞(不需证明);(3)若点( )n n n A x y ,要么落在1y =所表示的曲线上,要么落在1y =所表示的曲线上,并且0(0 4)A ,,求n S 的表达式.解:(1)设00( )2pA y -,,由于青蛙依次向右向上跳动, 所以10( )2p A y ,,20( )2p A y -,,由抛物线定义知:23S p =4 分 (2) 依题意,*2122122121 ()n n n n n n x x x y y x n N +-+-====∈, 011223342221212lim ||||||||||||n n n n n n S A A A A A A A A A A A A ---→∞=+++++++1021324354212221()()()()()()()n n n n x x y y x x y y x x x x y y --=-+-+-+-+-++-+-+1032542122()2()2()2()n n x x x x x x x x -=-+-+-++-+随着n 的增大,点n A 无限接近点(11),6 分 横向路程之和无限接近11122-=,纵向路程之和无限接近11122-=8 分所以 lim n n S →+∞=11122+=10 分(3)方法一:设点222212121( ) ( )k k k k k k A x y A x y +++,,,,由题意,n A 的坐标满足如下递推关系:2000 2x y ==,,且2122122(0 1 2 3 ) (0 1 2 3 )k k k k y y k x x k +++==== ,,,,,,,,,其中11212 k k y y +==,13 分∴111==2=,∴1=为首项,22244128k k k k x +=+⇒=,所以当n 为偶数时,284n n n x =+,于是122n n y +==,又221224(1)4(1)8k k k k x x +++++== ∴当n 为奇数时,21143 28n n n n n x y +++===,16 分 当n 为偶数时,011223342221212||||||||||||k k k k A A A A A A A A A A A A ---++++++10213243542122221()()()()()()()k k k k x x y y x x y y x x x x y y ---=-+-+-+-+-++-+- 10203142532123222()()()()()()()k k k k x x y y x x y y x x x x y y ---=-+-+-+-+-++-+- 2200()()k k x y x y =+-+当n 为奇数时,011223342221221||||||||||||k k k k A A A A A A A A A A A A --+++++++1021324354221212()()()()()()()k k k k x x y y x x y y x x y y x x -+=-+-+-+-+-++-+- 10203142532122121()()()()()()()k k k k x x y y x x y y x x y y x x ++-=-+-+-+-+-++-+- 212100()()k k x y x y ++=+-+所以,当n 为偶数时,2200()()(2)484n n n n n n S x y x y +=+-+=++-当n 为奇数时,210043()()(2)48n n n n n n S x y x y +++=+-+=+- 所以,212243(2)4(8(2)4(84n n n n n n S n n n ++⎧+++-⎪⎪=⎨⎪++-⎪⎩为奇数)为偶数)18 分 方法二:由题意知244668123456(12)(1 2)(3 2)(3 2)(6 2)(6 2)A A A A A A ,,,,,,,,,,,, 其中24681357(1 2)(3 2)(6 2)(10 2)A A A A ,,,,,,,,468102468(1 2)(3 2)(6 2)(10 2)A A A A ,,,,,,, 观察规律可知:下标为奇数的点的纵坐标为首项为22,公比为4的等比数列。