2018年湖南省普通高中学业水平考试真题(word清晰版)
(完整版)2018年湖南省普通高中学业水平考试数学试题(20200814150428)

2018年湖南省普通高中学业水平考试本试题卷包括选择题、填空题和解答题三部分,时量 120分钟 满分100分一、选择题:本大题共 10小题,每小题4分,共40分•在每小题给出的四个选项中,只有 一项是符合题目要求的5. 已知函数y = f (x ) ( x [ 1,5])的图象如图A • [ 1,1]B . [1,3]C • [3,5]D • [ 1,5]6. 已知a >b , c >d ,则下列不等式恒成立的是A . a+c >b + dB . a+d>b+cC . a-c>b-dD . a-b>c-d机密★启用前1.下列几何体中为圆柱的是 ()3所示,则f (x )的单调递减区间为(7.为了得到函数y cos(x4)的图象象只需将 y cosx 的图象向左平移()1 A •丄个单位长度2 1C •丄个单位长度4B .—个单位长度2二、 填空题;本大题共 5小题,每小题4分,共20分, 11. 直线y x 3在y 轴上的截距为 ___________________ 。
12. ______________________ 比较大小:sin25 sin23 (填、”或 N ” 13.已知集合 A 1,2 , B 1,x .若 A 「|B2,则 x= _______ 。
14•某工厂甲、乙两个车间生产了同一种产品,数量分别为 60件、40件,现用分层抽样方法抽取一个容量为 n 的样本进行质量检测,已知从甲车间抽取了 6件产品,则n =。
x 215•设x , y 满足不等等式组y 2 ,贝U z = 2x — y 的最小值为 __________ 。
x y 2三、 解答题:本大题共 5小题,共40分,解答应写出文字说明、证明过程或演步 16. (本小题满分6分)函数 f(x) log 2(x1)的零点为(1 A .-Bi C .乜D . 122210.过点M (:2, 1)作圆 C : (x1)2 y 22的切线, 则切线条数为()A . 0B . 1C . 2D . 3在△ ABC 中, 已知 A = 30 ° B = 45 9.AC = •. 2,贝U BC =( )O4个单位长度7. 为了得到函数y cos(x 4)的图象象只需将y cosx的图象向左平移( )1已知函数f (x) x (x 0)x(1 )求f (1)的值(2)判断函数f (x)的奇偶性,并说明理由.(2)设函数f (x) 2,求f (x)的值域,17. (本小题满分8分)某学校为了解学生对食堂用餐的满意度,从全校在食堂用餐的 取100名学生对食堂用餐的满意度进行评分. 根据学生对食堂用餐满意度的评分,得到如图4所示的率分布直方图, (1) 求顺率分布直方图中 a 的值(2) 规定:学生对食堂用餐满意度的评分不低于80分为满意”试估计该校在食堂用 餐的3000名学生中 满意”的人数。
湖南省普通高中2018年学业水平考试数学试题

2018年湖南省普通高中学业水平考试数学本试题卷包括选择题、填空题和解答题三部分,时量120分钟 满分100分一、选择题:本大题共10小题,每小题4分,共40分.在每小题给出的四个选项中,只有一项是符合题目要求的1.下列几何体中为圆柱的是2.执行如图1所示的程序框图,若输入x 的值为10,则输出y 的值为 A .10 B .15 C .25 D .353.从1,2,3,4,5这五个数中任取一个数,则取到的数为偶数的概率是A .45 B .35 C .25 D .154.如图2所示,在平行四边形ABCD 中中,AB AD += A .AC B .CA C .BD D .DB5.已知函数y =f (x )([1,5]x ∈-)的图象如图3所示,则f (x )的单调递减区间为 A .[1,1]- B .[1,3] C .[3,5] D .[1,5]- 6.已知a >b ,c >d ,则下列不等式恒成立的是 A .a +c >b +d B .a +d >b +c C .a -c >b -d D .a -b >c-d 7.为了得到函数cos()4y x π=+的图象象只需将cos y x =的图象向左平移A .12个单位长度 B .2π个单位长度C .14个单位长度 D .4π个单位长度 8.函数(1)2()log x f x -=的零点为A .4B .3C .2D .1 9.在△ABC 中,已知A =30°,B =45°,AC,则BC =A .12BCD .110.过点M (2,1)作圆C :22(1)2x y -+=的切线,则切线条数为 A .0 B .1 C .2 D .3二、填空题;本大题共5小题,每小题4分,共20分, 11.直线3y x =+在y 轴上的截距为_____________。
12.比较大小:sin25°_______sin23°(填“>”或“<”) 13.已知集合{}{}1,2,1,A B x ==-.若{}2AB =,则x =______。
2018年湖南省普通高中学业水平考试试卷

2018年湖南省普通高中学业水平考试试卷一、选择题(本题包括16小题,每题3分,共48分。
每小题只有一个选项符合题意) 1.发现万有引力定律的科学家是A .爱因斯坦B .卡文迪许C .开普勒D .牛顿 2.下列物理量属于矢量的是A .质量B .功C .重力势能D .力 3.列车员说“火车9点20分到站,停车10分。
”在这句话中 A .“9点20分”是指时刻,“10分”是指时间间隔 B .“9点20分”是指时间,“10分”是指时刻 C .“9点20分”与“10分”均指时刻 D .“9点20分”与“10分”均指时间间隔4.将一个物体从地球送到月球上,该物体在地球上的惯性与在月球上的惯性相比 A .在月球上惯性大 B .在地球上惯性大 C .惯性一样大 D .大小关系无法确定5.有两个共点力,其中一个力的大小是3N ,另一个力的大小是4N ,这两个力的合力的最大值为A .1NB .5NC .7ND .12N6.一位同学从操场中心A 点出发,先向北走了6m 到达C 点,然后向东走了8m 到达B 点,可以算出A 、B 两点间的距离为10m ,如图所示。
则该同学的位移大小和路程分别是 A .10m ,14m B .14m ,10m C .10m ,10m D .14m ,14m7.在同一平直公路上有A 、B 两辆汽车,它们的v-t 图象分别为a 、b ,如图所示,a 线平行于时间轴,b 线为过原点的倾斜直线,根据图象可知A .A 车静止,B 车做匀速直线运动B .A 车静止,B 车做匀加速直线运动C .A 车做匀速直线运动,B 车做匀加速直线运动D .A 车做匀速直线运动,B 车做匀速直线运动8.下列关于质点的说法正确的是A .研究跳水运动员在空中的翻转动作时,运动员可当做质点B .研究航天器绕地球运动的运行轨道时,航天器可当做质点C .研究地球自转时,地球可当做质点D .研究火车车轮的转动时,车轮可当做质点9.开普勒第二定律告诉我们:对任意一个行星来说,它与太阳的连线在相等的时间内扫过相等面积。
2018年湖南省普通高中学业水平考试真题(word清晰版)

2018年湖南省普通高中学业水平考试真题本试题卷包括选择题、填空题和解答题三部分,共4页.时量120分钟,满分100分一、选择题:本大题共10小题,每小题4分,共40分,在每小题给出的四个选项中,只有一项是符合题目要求的。
1.下列几何体中为圆柱的是 ( )2.执行如图1所示的程序框图,若输入x 的值为10,则输出y 的值为 ( ) A.10B.15C.25D.353.从1,2,3,4,5这五个数中任取一个数,则取到的数为偶数的概率是( ) A.54B.53C.52D.514.如图2所示,在平行四边形ABCD 中,=+AD AB ( ) A.AC B.CA C.BD D.DB5.已知函数()x f y =([]5,1-∈x )的图象如图3所示,则()x f 的单调减区间为( )A.[]1,1-B.[]3,1C.[]5,3D.[]5,1-6.已知d c b a >>,,则下列不等式恒成立的是 ( )A.d b c a +>+B.c b d a +>+C.d b c a ->-D.d c b a ->-7.为了得到函数⎪⎭⎫ ⎝⎛+=4cos πx y 的图象,只需将x y cos =的图象向左平移 ( ) A.21个单位长度 B.2π个单位长度C.41个单位长度 D.4π个单位长度8.函数()()1log 2-=x x f 的零点为( )A.4B.3C.2D.19.在ABC ∆中,已知︒=︒=45,30B A ,2=AC ,则=BC ( ) A.21B.22C.23D.1 10.过点()1,2M 作圆C :()2122=+-y x 的切线,则切线条数为 ( )A.0B.1 C.2D.3二、填空题:本大题共5小题,每小题4分,共20分。
11.直线3+=x y 在y 轴上的截距为________.12.比较大小:︒25sin ___︒23sin (填“>”或“<”).13.已知集合{}2,1=A ,{}x B ,1-=,若{}2=B A ,则=x ________.14.某工厂甲、乙两个车间生产了同一种产品,数量分别是60件、40件,现用分层抽样的方法抽取一个容量为n 的样本进行质量检测,已知从甲车间抽取6件产品,则=n ________.15.设y x ,满足不等式组⎪⎩⎪⎨⎧≥+≤≤222y x y x ,则y x z -=2的最小值为________.三、解答题:本大题共5小题,共40分。
2018年湖南高中学业水平考试英语试题及答案

2018年湖南高中学业水平考试英语第二部分阅读技能(共两节,满分30分)第一节 (共12小题;每小题2分,满分24分)A21. How long will the exhibition lastA. Five days.B. Seven days.C. Nine days.D. Eleven days.22. What will you get for free every day if you’re among the first 500A. A magazine.B. A ticket for a magic show.C. A great bargain.D. A chance to join in games.23. If you come with your family at 3 ., you’ll enjoy the programme________.A. Games and Quizzes.B. Lucky DrawC. Drama on Fun with jokesD. Story Telling24. For more information about the exhibition, you can_______.A. call the organizerB. write to the companyC. visit the websiteD. e-mail the publisherBChen Zijiang is a paper-cutting expert whom I interviewed for my article on Chinese Art. Paper-cutting is something that he learned to do from an early age.“It is a Chinese folk art with a long history,” Mr. Chen told me, “Paper cuts of animals have been found in tombs which date back to the time of the Northern and Southern Dynasty!” He added that by the Southern Song Dynasty, paper-cutting had become an important part of everyday life.Mr. Chen went on to explain that there are three types of paper cuts which people still make today: paper cuts for decoration, for religious purposes and for design patterns.Paper cuts used for decoration are often seen on windows and gates. They are often put up during holidays to bring good luck. They are also used on presents. For example, a present for parents whose child has recently been born might showa paper cut of children. Paper cuts which show the Chinese character for double happiness are often used to celebrate weddings.Paper cuts used for religious purposes are often found in temples. They are also used asofferings(祭品) to the dead. People to whom the dead person was related would make theseofferings on special days and during festivalsPaper cuts of the third kind are those used to make patterns on clothing. They are alsosometimes used to decorate jewellery boxes. Dragons are very popular patterns for these designs.The interview is very useful as I’ve got a lot of interesting information for my article. I am also ready to try out paper-cutting for myself.25. How many kinds of paper cuts did Mr. Chen talk aboutA. One.B. Two.C. Three.D. Four.26. According to Paragraph 4, paper cuts for decoration are used to______.A. bring good luckB. please guestsC. honor the deadD. make patterns on clothing27. What patterns can be often seen on jewellery boxes according to the passageA. Dragons.B. Pandas.C. Birds.D. Double happiness28. How does the writer feel about the interviewA. It’s boring.B. I t’s satis fying.C. It’s challenging.D. It’s disappointingCMrs. Timms listened as the radio announcer gave a hurricane (飓风) warning for her town. Then she woke up her sons, Eddie and Jasper, and quickly explained,"We’ve got a lot to do, boys. There is no school today, and my office is closed. The hurricane is coming!Just then, the boys grandfather arrived from his seaside home. Grandpa explained that the local government had told people to evacuate their homes by the sea. It just wasn’t safe for anyone to stay near the ocean during the hurricaneSoon afterwards, Mrs. Timms left to buy supplies that the family would need during the storm. Batteries, bottled water and canned food were a few of the items on her list.Grandpa stayed with the boys, and the three of them made preparations for the storm. First, they filled the bathtub and all the empty water bottles they could find. Next, they unplugged(拔掉插头)almost everything in the house. Then, Eddie helped Grandpa strengthen the windows. Meanwhile, Jasper put the outdoor chairs inside.Later, as the storm approached, the family stayed in protected areas away from the windows and outside walls. Mrs. Timms and Grandpa moved chairs to a protected space near the staircase. Eddie and Jasper sat under a strong table next to them, reading and playing games. They waited for the radio announcer to declare that the hurricane had passed.did Mrs. Timms do after hearing the hurricane warningA. She went to work.B. She woke up her sons.C. She prepared breakfast.D. She watched the hurricane.30. The underlined word “evacuate” in Paragraph 2 means______.A. lockB. reachC. repairD. leave31. While Eddie helped Grandpa strengthen the windows, Jasper_______.A. filled the bathtubB. turned off the lightsC. put the outdoor chairs insideD. sat under a strong table32. What could be the best title for the textA. A Happy Family.B. A Seaside House.C. The Damage of the Hurricane.D. The Day of the Hurricane.第二节 (共3小题;每小题2分,满分6分)Ways to Improve Social SkillsIf you feel like you're not good at social events or you struggle to enter into conversations because you're shy, it can influence your social life and you career(事业). However, you can start improve your social skills by following these ways and soon, you'll be able to enter into conversations with confidence.Behave Like a Social PersonYou can behave like a more social creature, even if you don't feel like it. Don't allow anxiety to hold you back. Make the decision to talk to new people and to enter into conversations even when you’re feeling nervous about it. Over time, it will get easier and you'll quickly start improving your social skills.If going to a party or spending time in a crowd seems confusing, start small. Go to a restaurant and order your food, an d say “Thank you” to the clerk. Practice making small talks gradually.Encourage Others to Talk About ThemselvesMost people really enjoy talking about themselves. Ask a question about a person’s career, hobbies, or family. Show you’re interested in hearin g what is being said.Good manners go a long way in improving social skills. Practice being polite,showing gratitude(感恩), and using good table manners..Your body language is very important in conversations, Pay attention to the type of bodylanguage you use. Try to appear relaxed, make appropriate amounts of eye contact, and appear open to conversations.A. Practice Good MannersB. Start Small if NecessaryC. Join a Social Skills Support GroupD. Pay Attention to your Body Language第三部分知识运用(共三节,满分25分)第一节完形填空(共10小题;每小题1分,满分10分)Mary, an 1l-year-old girl, became famous all over the world by accident. One day. Mary was showing her friend, Tom, how to use a camera. Then, Tom took a photo of Mary standing under an interesting___36______. Nothing happened until they got the photo developed. When they looked at the photo. they saw____37____ hanging down from the tree. At first, they thought it was a snake. Then they___38____ it was a leopard’s(猎豹)tail. Mary ____39____to go back to the tree to see if the leopard was ____40____ there. She wanted to get a nicer photo of her and the leopard. She and Tom went in the middle of the day, and found the leopard was still there___41____. So they managed to get a good photo of Mary and the sleeping leopard together.They showed the amazing picture to Mary's father, who owned the local newspaper. He put it in the Sunday paper. ___42____people saw the photo, they wrote letters to the___43____ asking to see more, so Mary started to take morephotos with many more wild animals. Soon a lot of magazines started to__44____ the photos from her. Mary and her___45___donated a lot of the money from their photos to a charity group called Save the Children.36. A. tree B. home C. picture D. bridge37. A. everything B. nothing C. any D. something38. A. argued B. realized C. remembered D. imagined39. A. refused B. hesitated C. decided D. agreed40. A. even B. once C. still D. almost41. A. alive B. asleep C. awake D. active42. A. When B. Though C. unless D. Before43. A. zoo B. park C. magazine D. newspaper44. A. buy B. save C. keep D. borrow45. A. teacher B. father C. brother D. neighbor第二节 (共10小题;每小题1分;满分10分)When Coca-Cola was first brought to China in 1928, it was hard for the company___46__ (translate)its name. After___47___(think) and discussing for years, they decided on using the“可口可乐”,__48____ means “tasty and fun”. Today the English name “Coke”is__49____(accept) by 94 percent of the world's population. The big success of Coca-Cola is due___50___the taste of the drink as well as its advertisements. Coca-Cola was___51_____first company to have ads on Chinese TV. In the beginning, its ads were___52____(usual) about American culture. As time goes by, many Chinese pop___53____ (star) have been appearingin Coke's ads. Thanks to___54___(they) help, the sales of the product become __55____(good) than ever.第三节改错(共5小题;每小题1分,满分5分)下列句子中各有一处语言错误,请把错误改正,其他部分不得改动。
湖南省2018年普通高中学业水平考试英语试题卷

优点英语2018年XX省普通高中学业水平考试英语本试题卷分听力技能、阅读技能、知识运用、写作技能四个部分,共8页。
时量120分钟,满分100分第一部分听力技能(共两节,满分20分)做题时,先将答案标在试题卷上。
录音内容结束后,你将有两分钟的时间将试题卷上的答案转涂到答题卡上。
第一节(共5小题;每小题1分,满分5分)听下面5段对话。
每段对话后有一个小题,从题中所给的A、B、C三个选项中选出最佳选项,并标在试题卷的相应位置。
听完每段对话后,你都有10秒钟的时间来回答有关小题和阅读下一小题,每段对话读两遍。
例:Howmuchistheshirt?A.£19.15B.£9.18C.£9.15答案是C。
听下面一段对话,回答第1小题。
I.Whatdidthemaneatfordinner?A.PizzasB.Dumplings.C.Noodles听下面一段对话,回答第2小题。
2.Wherearethespeakersgoing?A.Tothepark.B.TothestationC.Tothemuseum.听下面一段对话,回答第3小题。
3.Whendoesthewomangotowork?A.At8:00.B.At9:00.C.At10:00听下面一段对话,回答第4小题。
4.Howoftendoesthemanworkout?A.OnceaweekB.Twiceaweek.C.Threetimesaweek听下面一段对话,回答第5小题。
5.Whatwillthewomandothisweekend?A.Seeafilm.B.Dohousework.C.Lookafterhersister.第二节(共15小题;每小题1分,满分15分)听下面5段对话或独白。
每段对话或独白后有几个小题,从题中所给的A、B、C三个选中选出最佳选项,并标在试题卷的相应位置。
听每段对话或独白前,你将有时间阅读各个小题,每小题5秒钟;听完后,各小题将给出5秒钟的时间作答。
2018湖南学业水平化学真题(可编辑修改word版)

·化学E rr o r!说明:本卷包括选择题、填空题、实验题和选做题四道大题。
考试时量90 分钟,满分100 分。
可能用到的相对原子质量:H—1 C—12 N—14 O—16 Na—23 Cl—35.5 Ca—40第一部分必做题(80 分)一、选择题(本题包括22 小题,每小题2 分,共44 分。
每小题只有一个选项符合题意)1.天然气是目前推广使用的清洁燃料,它的主要成分是( )A.CO B.H2C.CH4D.CH3OH2.下列气体中,对人体无毒害作用的是( )A.Cl2B.SO2C.NO2D.O23.贴有右图所示标志的槽罐车内可能装有( )A.液氯B.汽油C.浓硫酸D.四氯化碳4.用激光笔照射烧杯中的豆浆时,可看见一条光亮的“通路”,该豆浆属于( )A.悬浊液B.乳浊液C.胶体D.溶液5.实验室里的药品是分类存放的。
现有一瓶稀盐酸,应放入下列哪个药品柜( )药品柜 A B C D药品Fe 粉Zn 粒稀HNO3稀H2SO4KOH 溶液NaOH 溶液BaCl2溶液Na2SO4溶液A.36Li 和73LiB.164C 和174N C.O2和O3D.H2O 和H2O27.下列有机物中,不属于烃类的是( )A.CH3CH3B.C6H6C.CH2===CH2D.CH3COOH8.芯片是各种计算机、手机和微电子产品的核心部件,它的主要材料是( )A.Si B.SiO2C.H2SiO3D.Na2SiO39.向盛有Fe2(SO4)3溶液的试管中滴入几滴KSCN 溶液后,溶液呈( )A.无色B.黄色C.红色D.浅绿色10.在溶液中,下列离子能与CO 2-3大量共存的是( )A.H+B.Na+C.Ca2+D.Ba2+11.将一小块钠投入水中,发生反应:2Na+2H2O===2NaOH+H2↑,该反应的还原剂是( )A.Na B.H2O C.NaOH D.H212.从海水资源中提取下列物质,不用化学方法可能得到的是( )C ··l A .Mg B .Br 2 C .I 2D .NaCl 13.下列物质中,不能发生水解反应的是( ) A .葡萄糖 B .蔗糖 C .油脂 D .纤维素14.下列有关物质用途的叙述中,错误的是( )A .氧化铝可用于制造耐火坩埚B .二氧化硫可用来漂白食品C .氧化铁可用作红色油漆和涂料D .硅酸钠溶液可用作木材防火剂 15.为探究 Al(OH)3 的性质,某同学取两支洁净的试管,加入适量 Al(OH)3 悬浊液,然后分别滴加足量的:①稀盐酸;②NaOH 溶液。
完整版)2018年湖南省普通高中学业水平考试物理试卷及答案

完整版)2018年湖南省普通高中学业水平考试物理试卷及答案2018年湖南省普通高中学业水平考试物理试题本试题卷分为选择题和非选择题两部分,共6页,时长90分钟,总分100分。
选择题部分共16小题,每小题3分,共48分。
在每小题给出的四个选项中,只有一项符合题目要求。
1.矢量物理量是指具有大小和方向的物理量,因此选项C 速度是矢量物理量。
2.国际单位制中的基本单位包括米、千克、秒、安培、开尔文和XXX,因此选项B秒是基本单位。
3.在物理学研究中,质点是指物体的大小和形状可以忽略不计,只考虑它的质量和位置,因此选项A理想模型法是指将物体视为质点的科学方法。
4.根据牛顿第三定律,小球与挡板和斜面分别接触,每个接触面都会有一个反作用力,因此小球所受力的个数为2个,选项B是正确答案。
5.观察路旁的树在向北运动,说明XXX同学选取地面为参考系,而公交车在向南运动,因此选项D是正确答案。
6.运动员从P点到Q点再返回P点,位移为0,而路程为50m,因此选项B是正确答案。
7.图象B描述了火车做匀减速直线运动的情况,因此选项B是正确答案。
8.物体处于静止状态,说明合力为0,而水平拉力F的大小为3N,因此选项C是正确答案。
9.在A点,质点所受合力方向与F3的方向相同,因此选项C是正确答案。
10.在忽略空气阻力的情况下,小球在下落过程中只受重力作用,重力对小球做正功,因此选项A是错误答案。
11.根据万有引力定律,近日点A距离太阳更近,太阳对它的引力更大,因此选项C是正确答案。
12.汽车以恒定功率P由静止加速启动,根据公式P=Fυ,可以得出该过程中汽车的牵引力不变。
13.如图6所示,圆盘上的物块随圆盘一起在水平面内转动。
当圆盘以角速度ω1匀速转动时,物块所受摩擦力为F1;当圆盘以角速度ω2匀速转动时,物块所受摩擦力为F2,且ω1<ω2,物块始终未滑动。
因此,F1<F2.14.如图7所示,竖直放置的圆环绕OO'匀速转动,OO'为过圆环圆心的竖直转轴,A、B为圆环上的两点,用υA、υB分别表示A、B两点的线速度大小,用ωA、ωB分别表示A、B两点的角速度大小。
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
2018年湖南省普通高中学业水平考试真题
本试题卷包括选择题、填空题和解答题三部分,共4页.
时量120分钟,满分100分
一、选择题:本大题共10小题,每小题4分,共40分,在每小题给出的四个选项中,只有一项是符合题目要求的。
1.下列几何体中为圆柱的是 ( )
2.执行如图1所示的程序框图,若输入x 的值为10,则输出y 的值为 ( )
A.10
B.15
C.25
D.35
3.从1,2,3,4,5这五个数中任取一个数,则取到的数为偶数的概率是( ) A.54 B.53 C.5
2 D.51
4.如图2所示,在平行四边形ABCD 中,=+AD AB ( ) A.AC B.CA C.BD D.DB
5.已知函数()x f y =([]5,1-∈x )的图象如图3所示,则()x f 的单调减区间为( )
A.[]1,1-
B.[]3,1
C.[]5,3
D.[]5,1-
6.已知d c b a >>,,则下列不等式恒成立的是 ( )
A.d b c a +>+
B.c b d a +>+
C.错误!未找到引用源。
D.d c b a ->-
7.为了得到函数⎪⎭
⎫ ⎝⎛+=4cos πx y 的图象,只需将x y cos =的图象向左平移 ( ) A.21个单位长度 B.2π个单位长度 C.41个单位长度 D.4π个单位长度
8.函数()()1log 2-=x x f 的零点为( )
A.4
B.3
C.错误!未找到引用源。
D.错误!未找到引用源。
9.在ABC ∆中,已知︒=︒=45,30B A ,2=AC ,则=BC ( ) A.21
B.22
C.23
D.1
10.过点()1,2M 作圆C :()2122=+-y x 的切线,则切线条数为 ( )
A.0
B.1
C.错误!未找到引用源。
D.3
二、填空题:本大题共5小题,每小题4分,共20分。
11.直线3+=x y 在y 轴上的截距为________.
12.比较大小:︒25sin ___︒23sin (填“>”或“<”).
13.已知集合{}2,1=A ,{}x B ,1-=,若{}2=B A ,则=x ________.
14.某工厂甲、乙两个车间生产了同一种产品,数量分别是60件、40件,现用分层抽样的方法抽取一个容量为n 的样本进行质量检测,已知从甲车间抽取6件产品,则=n ________.
15.设y x ,满足不等式组⎪⎩
⎪⎨⎧≥+≤≤222y x y x ,则y x z -=2的最小值为________.
三、解答题:本大题共5小题,共40分。
解答应写出文字说明、证明过程或演算步骤。
16.(本小题满分6分)已知函数()()01≠+=x x
x x f .
(1)求()1f 的值.
(2)判断函数()x f 的奇偶性,并说明理由.
17.(本小题满分8分)某学校为了解学生对食堂用餐的满意度,从学校在食堂用餐的3000名学生中,随机抽取100名学生对食堂用餐的满意度进行评分,根据学生对食堂用餐的满意度评分,得到如图4所示的频率分布直方图.
(1)求频率分布直方图中a 的值.
(2)规定:学生对食堂用餐的满意度评分不低于80分为“满意”,试估计该校在食堂用餐的3000名学生中“满意”的人数.
18.(本小题满分8分)已知向量()⎪⎪⎭
⎫ ⎝⎛==22,22,cos ,sin b x x a . (1)设b a =,求x tan 的值.
(2)设函数()2+⋅=b a x f ,求()x f 的值域.
19.(本小题满分8分)如图5所示,四棱锥P-ABCD 的底面是边长为2的正方形,ABCD PA 底面⊥.
(1)求证:PAD CD 平面⊥.
(2)若E 为PD 的中点,三棱锥C-ADE 的体积为3
2
,求四棱锥P-ABCD 的侧面积.
20.(本小题满分10分)在等差数列{}n a ,5,1321=+=a a a .
(1)求n a .
(2)设n
a n n a
b 2⋅=,求数列{}n b 的前n 项和n T . (3)对于(2)中的n T ,设122
2+-=n a n n T c ,求数列{}n c 中的最大项.。