已知向量，的夹角为，且＝（1，0），||＝，则|2|＝　 　．

已知双曲线的离心率为若以2﹣1为圆心r为半径的圆与该双曲线的两条渐近线组成的图形只有一个公共点则半径r＝

点P﹣25在第象限

点M-3a2a≠0所在的象限是

已知函数fx＝|x﹣1|﹣2|x﹣a|+1a＞1． Ⅰ当a＝3时解不等式fx＞0 Ⅱ若x的图象与x轴围成图形的面积大于6求实数a的取值范围．

二项式的展开式中常数项为用数字作答

如图是温度计的一部分它指示的温度是℃．

第一节完形填空 ThespringIwasinGradeThreemyteacherplannedactivitiestocelebratetheseason.ForweeksI41dying染色eggs.Itoldmomhowmuchfunitwouldbe.BeforethebigdaymyteachertoldustocometoclassonFridaywithanemptyinside42andourspellingtestsignedbyaparentandifwedidn'ttheteacher43wewouldsitoutfromtheactivities. AtnineyearsoldIwasthe44student.Iwashard﹣workingobedient顺从的andresponsible.SowhenIforgottobringmyspellingtestIwas45andfrightened.Iknewwhatthe46wouldbe.Whenmyclassjumped47fromtheirchairstocollectartsuppliesIsat48atmydeskfightingthewelling﹣uptears. Itwasn't49beforemyteacherpulledmeaside.ShekneltdownandtoldmeIshould50theclass.With51inhereyesshetoldmeIcouldbringmyspellingtestonMonday.Andthenshegave52ahug.My53disappearedwiththisunexpectedgift. Twentyyears54Istillrememberthatmomentwhenmyteachergraced使人增添优雅mewithloveand55.Shecouldhavestoodhergroundandletmesitoutasanexampletotheotherstudents.56sheknewpunishingmeforthissmall57wouldn'tteachmeanewlesson. ThelessonI58washowmuchgracecanliftsomeone's59Thismovesmeto60thesamegracetoothers. 41.A.lookedfor B.lookedinto C.lookedforwardto D.lookedthrough 42.A.bottle B.bag C.egg D.box 43.A.scolded B.warned C.praised D.believed 44.A.shy B.pretty C.annoying D.perfect 45.A.puzzled B.shocked C.funny D.fortunate 46.A.result B.cause C.reason D.exam 47.A.slowly B.hopefully C.heavily D.happily 48.A.still B.calm C.relaxed D.stubborn 49.A.short B.certain C.long D.soon 50.A.leave B.serve C.desert D.join 51.A.water B.trust C.sweat D.rain 52.A.us B.me C.mom D.them 53.A.satisfaction B.pleasure C.disappointment D.memory 54.A.ago B.before C.on D.later 55.A.understanding B.knowledge C.skill D.ability 56.A.and B.so C.or D.but 57.A.gift B.toy C.mistake D.art 58.A.learned B.taught C.had D.took 59.A.life B.spirit C.height D.quality 60.A.offer B.tie C.change D.compare

因式分解xx-y+yy-x

求下列各数的平方根-3

已知某公司生产的一种产品的质量X单位千克服从正态分布N9064．现从该产品的生产线上随机抽取10000件产品其中质量在区间82106内的产品估计有附若X﹣Nuσ2则Pu﹣σ＜X＜μ+σ≈0.6826Pu﹣2σ＜X＜u+2σ≈0.9544．

因式分解a2-2a-b2+1

如果点At-3s2t+2sB14-2t+s3t-2s-2关于x轴对称求st的值

因式分解x2-7x-8

已知函数fx＝﹣|x﹣a|+agx＝x2﹣4x+3若方程fx＝|gx|恰有2个不同的实数根则实数a的取值范围是

设p|x﹣|＜q2x≥1则p是q的

已知xy满足|x﹣1|+1≤y≤x+7．则z＝|3x﹣4y﹣5|的最大值为．

已知两条不重合的直线mn两个不重合的平面αβ有下列四个命题 ①若m∥nm⊂α则n∥α ②若n⊥αm⊥β且m∥n则α∥β ③若m⊂αn⊂αm∥βn∥B则α∥β ④若α⊥βα∩β＝m且n⊂βn⊥m则n⊥α 其中所有正确命题的序号为

在△ABC中角ABC所对边长分别为abc且bsin2C＝csinB． Ⅰ求角C Ⅱ若求sinA的值．

Willheworktogetbettergrades? A.hardenoughB.enoughhardC.hardlyenough D.enoughhardly

Positivethinkersadmitwhentheyfeelfrustratedordepressedtheydon'tignoreit.Buttheydon'tblamethemselveseither.36Theycounter反击themwithmorepositiveones. Sohowdoyoustaypositivemaintainmotivatedandsustainhealthybehaviors?Herearesometips Lookforagoodrolemodel.Thereisalwayssomeonewhoseemstobedoingjustwhatyouwanttobedoing.Maybethey'vescheduledexerciseintotheirworkdayandswitchedfromcoffeetogreentea.37Askthemhowtheykeephealthyandfollowtheirfootsteps. 38Takeaminutetogiveyourselfanegoboost自我吹捧.Repeatsomemotivationalwordsoutloudtoyourself.NegativetalksuchasIcan'tdoit.I'mfat.isdangerousforyourwell﹣beingandhealthygoals.Trytoavoidthenegativeself﹣talkbeforeitharmsyou.Remindyourselfthatyoudeservehappinessandcanmakepositivechanges. Getsupport.Tellyourfriendsandfamilyaboutyourhealthyhabits.Ithelpstohaveanencouragingnetwork. Rewardyourself.39TakeanicebathgetamassageandenjoyanewDVDorCD. Haveaplan.Makingaplantoexerciseoreathealthyluncheswithafriendcanmeanthedifferenceofstickingwithyourgoalsorfallingoffrack.Ifyou'veplannedforanactivityyou'lllikestickwithit.Youmayevenfindthatwritingdownyourgoalsandstepstoachievethemcanhelpyoustayontrack.Takeitdaybydayorweekbyweek.40 A.Trysomepositiveself﹣talkandavoidnegativetalk. B.Staywithyourparentsandrelativesandyoucanavoidfrustrationordepression. C.Treatyourselftosomethingforyourhealthyefforts. D.Theytrytounderstandthenegativethoughtsandfeelingsinstead. E.Learnfromasuccessfulfriendfamilymemberorcolleague. F.Theprocessofwritingdownyourpersonalactionplanisagoodwaytowatchyourprogressorfailures. G.Believeinyourselfanddoasothersdo.

在△ABC中内角ABC的对边分别为abc已知． Ⅰ求角C Ⅱ若AD是BC上的中线延长AD至点E使得DE＝2AD＝2求EC两点的距离．

求下列各数的平方根144

如图△ABC中任意一点Pxy经平移后对应点为x+3y-2画出它作同样平移后的△A'B'C'并写出A'B'C'的坐标 A' B' C'

IwanttogotoJapanbutIdon'thavemuchm.

某车间每天能生产甲种零件500只或者乙种零件600只或者丙种零件750只甲乙丙三种零件各一只配成一套现要在30天内生产最多的成套产品问甲乙丙三种零件各应生产多少天

因式分解25x2+20xy+4y2

做课间操时小明小刚和小红三人的相对位置如图如果用34表示小明的位置13表示小刚的位置则小红的位置可表示为A．00 B．01 C．10 D．12

如图将△AOB绕点O逆时针旋转90°得到△A'OB'若点A的坐标为ab则点A'的坐标为

以平面直角坐标系的原点为极点x轴的正半轴为极轴建立极坐标系两种坐标系中取相同的长度单位．已知直线l的参数方程是t为参数圆C的极坐标方程是ρ＝4cosθ则直线l被圆C截得的弦长为．

如图长方形ABCD中AB=4BC=8．点P在AB上运动设D点P从点D出发沿D—A—B运动到点B停止设点P运动的路程为x线段PC扫过的面积为S．1求S与x之间的函数关系式并写出自变量x的取值范围2点P在什么位置时线段PC扫过图形的面积等于20．思考3当PB=2AP时求x的值

因式分解4xx-1-10x-1

计算a-ba+ba2+b2a4+b4a8+b8

Expertssaythatfeeling61sleeparoundtwoorthreeo'clockintheafternoonisquitecommonandaquicksleepduringthedayisgoodforyouandthatyourworkwillimprove62aresult. ResearchersfromJapan'sCentreforMentalHealthstudiedthesleeping63habitof24workers.Twelveluckyworkers64telltotakeanapintheafternoonand65othertwelvehadtocontinueworking.Theresearchersthendidsometestsonalltheworkerstofindouthowefficienttheywere.Theresultsshowedthatthepeoplewhohadbeenallowed66takeanapscoredabout10percent67highontheteststhanthosewhohadnotbeenallowedanysleepatall.Theresearcherscontinuedwiththeirtestsforseveralhours68discoveredthatthesleepersstillperformedbetterinthetests69dotwoorthreehourslater. Sothenexttimeyoufeeltiredinclassandwanttotakeanapjust70explaintoyourteacherthatyouwillgetmuchmaredonewhenyouwakeup.

已知棱长都为2的正三棱柱ABC﹣A1B1C1的直观图如图若正三棱柱ABC﹣A1B1C1绕着它的一条侧棱AA1所在直线旋转则它的侧视图可以为

计算-3x2yz32

计算x-y2·x+y2

ChooseYourVIRGINIA GrandCavernsisAmerica'sOldestShowcavebeautifulandmassiveformations.Uniontroopsvisitedthecaverns.ThomasJeffersonvisited﹣youshouldtoo!OpenweekendsinMarchdailyApril﹣October.9a.m﹣5p.m.Hourtoursleaveevery30minutes.703/249﹣5705. RockHouseMuseum.TakeajourneythroughhistorywithavisittotheexcitingmuseumandhistoricsitesofWytheville.TheRockHouseMuseumoffersglimpsesintodailylifeinthe19thcentury.Themuseumispartofthe50structuresfeaturedinWytheville'sHistoricWalkingTour.540/223﹣3330. TheNewseuminArlington.theworld'sonlyinteractivemuseumofnews.Visitorscanbereportersortelevisionnewscastersseetoday'snewsasithappensonablock﹣longvideonewswallandbetakenbehindthescenestoseehownewsismade.TheNewseumisopenWednesdaythroughSundayfrom10a.m.﹣5p.m. KenmorePlantation&GardensvisitovertwohundredyearsofhistoryfromtheRevolutionaryWarCivilWarandintothe21stCentury.HomeofBettyWashingtonGeorgeWashington'sonlysisterandPatriotCol.FieldingLewis.Explorethishistoricbuildingandcityblockofrestoredgardens.540/373﹣3381. VirginiaBeachoffers11000hotel/motelroomspluscottagesandcampgrounds.Enjoymilesofcleanbeachesandavarietyoffamilyattractions.Finerestaurantsvariousshoppingareasexcitingnightlifeandspecialeventsareofferedthroughouttheyear.800/822﹣3224. 21.WhencanyouvisitAmerica'sOldestShowcaveinJuly? A.Anyday. B.Onlyonweekends. C.Anydayexceptweekends. D.WednesdaythroughSunday. 22.InwhatwayistheNewseumdifferentfromRockHouseMuseum? A.Itislarger. B.Itismoreexciting. C.Visitorscanactinit. D.Visitorscanseemoreinit. 23.Ifyouwanttoenjoyyourselfintheeveningyoumaygoto. A.theNewseum B.KenmorePlantation&Gardens C.GrandCaverns D.VirginiaBeach.

设数列{an}的前n项和为Sn满足a1＝23Sn＝n+manm∈R． Ⅰ求m的值及{an}的通项公式 Ⅱ数列{bn}满足anbn＝n{bn}前n项和为Tn若存在n∈N*使得λ+Tn≥T2n成立求实数λ的最小值．

Thosetradearewarm-hearted.

计算-x23-x6

利用因式分解计算 6832-3172

已知ab∈Ra＞b＞0是|a﹣1|＞|b﹣1|的

已知数列{an}的前n项和Sn满足Sn＝﹣an﹣n﹣1+2n为正整数 Ⅰ令bn＝2nan求证数列{bn}是等差数列并求数列{an}的通项公式 Ⅱ令Tn＝． ①化简Tn的表达式 ②证明Tn的最小值是1．

如图所示的图象中描述物体处于静止状态的是

某服装厂专门安排210名工人进行手工衬衣的缝制每件衬衣由2个衣袖1个衣身1个衣领组成如果每人每天能够缝制衣袖10个或衣身15个或衣领12个那么应该安排名工人缝制衣袖才能使每天缝制出的衣袖衣身衣领正好配套．

分解因式x-5²+85-x+16

若lga+lgb＝0则的最小值是．

计算p7÷-p4

China'sfamedbikewarsmaysoonbefoughtonforeignshoresasBluegogoandMobikecompetewithfellowstand﹣freecyclehirecompanyofointheBritishmarket. Cyclehirestartupsso﹣calledbikeUbersarebigbusinessinChina.Around30companiescontroltensofthousandsofbikesinatleast35Chinesecities.ThetwolargestofoandMobikerecentlysecured﹩450millionand﹩300millioninfundingrespectively. AlreadylockedinabattleformarketshareacrossChinathestartupsnowhaveLondonintheirsights.ElsewhereintheUKthismonthBeijingBikelockTechnology'sbikehirebusinessofoislaunchingapilotbike﹣hiringschemeinCambridge.MobikeisreportedlyinterestedinlaunchingsimilarprojectsinBirminghamandManchester. TheSundayTimesrecentlyreportedBluegogoandMobikewerelookingatLondon. BothLondonandBirminghamalreadyhavebike﹣hireschemes.TheChineseservicesdifferindoingawaywithdockingstations.UsersofthebikesofferedbytheChinesecompaniesarefreetopickupacyclewherevertheyfindoneandleaveitwherevertheywantusingasmartphoneappandacodetodeactivateandactivate激活abuilt﹣inlock. Thecapital'stransportauthorityTransportforLondonhasexpressedinterestinthenewtechnology. TfL'sheadofstrategyandoutcomeplanningLilliMatsonsaidWearealwayskeentotalktocompaniestoexploreadvancementsintechnologyanddiscussnewideasandhavespokenwithanumberofcompaniestounderstandtheirplans. AspokespersonforofosaidWehavehadbriefdiscussionswithTfLabouthowourschemeworksinChinaandothermarketsandtheyareinterestedinhearinghowourtrialworksinCambridge.OurprimaryfocusisensuringtheCambridgetrialisasuccess.Wewillpotentiallylooktoenterotherareaslater. 32.Wherewillofolaunchtheirpilotbike﹣hiringplanintheUK? A.Birmingham B.Manchester C.Cambridge D.London 33.Whenyouwanttohireabikewhatshouldyouhaveinadvance? A.Anapp B.Asmartphone C.Acode D.Acycle 34.Fromthefourthparagraphweknowthat. A.BluegogoandMobikeweregoingtovisitLondon B.BluegogoandMobikewereplanningtoexpandthemarketinLondon C.BluegogoandMobikewerelookingforwardtoLondon D.BluegogoandMobikewerelaunchingbusinessinLondon 35.Whichmaybethebesttitleofthepassage? A.ChinesebikewarstobreakoutinUK B.ChinesebikebusinessinUK C.ChinesebikewartofightagainstUK D.ChinesebikeUbersinUK.

如图在平面直角坐标系中一动点从原点O出发沿着箭头所示方向每次移动一个单位依次得到点P101P211P310P41-1P52-1P620则点P2019的坐标是

在极坐标系中已知曲线C1的方程为ρ＝6sinθ曲线C2的方程为ρsinθ＝1．以极点O为原点极轴为x轴正半轴建立直角坐标系xOy． 1求曲线C1C2的直角坐标方程 2若曲线C2与y轴相交于点P与曲线C1相交于AB两点求的值．

已知实数xy满足则x的范围为的最大值为．

Thehospitalisinfofthehotel.

Doyouhaveabusinessbrain?Areyoualwayslookingforthenextbigidea?Maybelikemeyoumightfeelsettingupanewcompanyissomethingyoumightdowhenyou'reolderwhenyouhavemoreexperience.Butthat'snotalwaysthecase. Whilesomeofusmayfeelyoungadulthoodisatimeofuncertainlyfindingourplaceintheworldsleepinglateandpartyinghardothersarealreadyonapathtogreatbusinesssuccess.TakethefounderofMicrosoftBillGateswhostartedhiscompanyasayounguniversitystudentatHarvardintheUS.Therearemanyotherexamplesofyoungentrepreneurs企业家whohavebecomehugelysuccessfulprovingthatthere'snominimumagetobecomingtopdog. Buttobethenextbusinessexecutiverequireseffort.Youneedtoacquireakeenmindandgoodbusinessintelligenceandaboveallyouneedenthusiasm.Startinganewbusinesscomeswithanelementofriskbutifyouareabletospotthenextbigideait'sprobablyworthgivingitatry.JessicaRoseownsajewelrymakingbusinessandadmitsthatwhenIfirststartedIhadnobusinesstrainingbutwhenIwokeuponedayIthoughtI'dreallylovetobeajewelrydesigner.Shewentontobeasuccessfulyoungentrepreneur. Beingyoungandinbusinessdoeshaveitsdrawbacksyoumayworryyouhavenothingtobringtothetableandthatthepeoplewhoworkforyoutendtobeolderandwiser.That'swhatyoungBritishentrepreneurSulemanSacraniefound.Hestartedhisthirdbusinesswhilestudyingchemistryatuniversity.HesaysnowI'vegottwoadditionaldirectorswhohavegreyhairbutwhentheyfirststartedhesayshecouldtelltheywerethinkinginthebackoftheirheadsI'vegotakidsittinginfrontofme. Youmaythinksettingupanewstart﹣upiseasiersaidthandone.Aswellasideasyouneedfinancialbackingandexpertguidance.Butifyou'restudyinghardatuniversityanddon'thavethedesiretogointobusinessandmakeyourfortunekeeponstudying﹣aneducationispriceless! 29.Attheverybeginningwhat'stheauthor'sattitudetothenecessityofbeingagedandexperiencedinsettingupanewcompany? A.Supportive. B.Negative. C.Impersonal. D.Critical. 30.TheauthortakesJessicaRoseforexampleinordertoshowthat. A.doingbusinessneedsgreateffort B.enthusiasmismoreimportantthanakeenmind C.businesstrainingisnotnecessary D.itiseasytosetupanewbusiness 31.Whatcanbeinferredfromthelasttwoparagraphs? A.Olderdirectorsshouldn'tbeemployedifyouareyoung. B.Ageplaysanimportantroleinsettingupnewbusiness. C.Ifyoudon'tintendtosetupbusinessjustfocusonyourstudy. D.Educationismorevaluablethansettingupabusiness.

如图所示木块的长度为cm

因式分解x2y-2xy-15y

已知函数x＝lnx+ax+1a∈R I讨论函数fx的单调性 Ⅱ若函数fx的图象与x轴相切求证对于任意互不相等的正实数x1x2都有．

解下列方程

Longinthe1700shomewasusedasaverbmeaningtobeguidedtoadestination.Sowhenyouhomeinonsomethingyougetclosertoyourtarget.ForexampleyoucouldsayPolicearehominginonthesuspects. Buttodayhomeismoreoftenusedasanoun.AndithasaveryemotionalconnectionforAmericanEnglishspeakers.YoucanrememberthemeaningofthewordbytheexpressionHomeiswheretheheartis.Thatexpressionmeanshomeisanywhereyoufeelloveandcomfort.Itisaplacewhereyoubelongandoftenaplaceyouconsideryourorigin.Youcanalsosimplycarrythefeelingofhomewithyou﹣﹣thatisafeelingofloveandloyaltytoyourfamilyandplacesthataredeartoyou. Inotherwordshomeisnotsimplyabuildingwhereyoulive﹣that'sahouse.Somepeoplefindthatreturningtoachildhoodplacebringsonlyjoyanddelight.WhenthesepeoplereturntotheirchildhoodhomestheymaysayHomeSweetHome! Ofcourseyoucansaythisanywhere.AsinglewomanlivingaloneinherfirstapartmentmaycomehomeafteratoughdayatworkandsighAhhomesweethome!IfshelovesherapartmentshemightalsosayThere'snoplacelikehome. Butwhataboutthosepeoplewhomuststayawayfromtheirhomesforalongtime?Theystillwanttofeelconnectedtoaplacetheycandependon.Hotelsknowthisabouttravelers.Manyadvertisethattheywillbeahomeawayfromhome.Thisexpressiondescribesaplacewhereeverythingisfamiliarandcomfortable. Friendscanalsogiveyouahomeawayfromhome.WhenyouvisitthemtheymaysaytoyouMakeyourselfathome!Thiscommonexpressionmeanssomeonewantsyoutofeelrelaxedandwelcome. 24.Whenthepolicesaytheyarehominginonthesuspectstheymean. A.theywillgotothesuspects'home B.theywillcatchthesuspectssoon C.theyaregoinghomewiththesuspects D.theyaregettingclosertothehome 25.WhatdoestheunderlinedworddearinPara2mean? A.precious B.expensive C.familiar D.favorite 26.Whydomanyhotelsadvertisethattheywillbeahomeforthetravelers? A.Toprovideahomeforthetravelers B.Tomakethetravelersbelievetheyhaveahome C.Toconvincethetravelersofhowcomfortabletheirhotelsare D.Todescribetheirhotelsmorevividly 27.Whenyouwanttomakesomeonefeelrelaxedandwelcomeyoucansay. A.Helpyourself B.Makeyourselfathome C.Justdoit D.Don'tbenervous.

在10件产品中有3件一等品4件二等品3件三等品．从这10件产品中任取3件求 I取出的3件产品中一等品件数X的分布列和数学期望 II取出的3件产品中一等品件数多于二等品件数的概率．

在如图所示的计算1+5+9++2017程序框图中判断框内应填入的条件是

计算-32-|2-|+-12016-

已知a-2b=ab=3求-a4b2+4a3b3-4a2b4的值．

已知函数的最大值是6则实数m＝函数fx的单调减区间是．

若把分式中xy都扩大3倍那么分式的值A．扩大3倍 B．不变 C．缩小3倍 D．缩小6倍

Heiskindoffunnybecausehealwayswearsapairoffunnyg.

分解因式 3xa-b-6yb-a．

因式分解x2y2-1

某汽车制造厂接受了在预定期限内生产一批汽车的任务如果每天生产35辆则差10辆才能完成任务如果每天生产40辆则可超额生产20辆若设预定期限是x天计划生产y辆汽车依题意可列方程组

Youmightnotrealizejusthowmuchworkgoesintomakinganewspaper.Apartfromsearchingforagoodstoryandtheendlesseditingrequiredtocorrectmistakescopyeditorsneedtomakesurethateverythingfitsperfectly.Agoodheadlinetellsasmuchaspossibleinashortspace.Thereneverseemstobequiteenoughspacetoexpresscompletelywhatyouwanttosay. Newsheadlinesoftenfocusonthecentralandmostimportantnewinformation.Therelevantlyinsignificantinformationmightbeleftoutinordertostressthemainideaorjusttobebrief.Newsheadlinesarefeaturedbythevividlanguage.Theyaddsomethingspecialtoattractreaders'eyes.Becausetheheadlineaimstodescribethemainfocusofthestoryinsixorsevenwordseverywordcountsandaccuracyisdecisive.Forinstancestab刺杀isabetterverbthankillbecauseittellsthereaderhowthecriminaldidhisdeedsimilarlyToyotaisabetternounthancar.Butthemakeofagoodheadlineisnotcharacterizednecessarilybytheamountofinformationinit.Forinstancethefront﹣pageheadlineontheLosAngelesTimesonSeptember11﹣thedayNewYork'sWorldTradeCenterwasattacked﹣simplyreadTERRORSTRIKESallincapitals.Whilethesetwowordsdonotdescribehowwhereorwhythebuildingswereattackedtheywereaccompaniedbyahalf﹣pagephotothatcaptured捕捉theeventinwhicharound3000peoplelosttheirlives. 1Whatisvitalinmakingnewsbesidesagoodstoryandperfectedition? A.Anappropriateheadline B.Acapitalheadline C.Vividlanguage D.Abriefreport 2Newheadlinesshouldbe. A.attractive B.countable C.insignificant D.longenough 3Theunderlinedwordtheyinthelastparagraphrefersto. A.thebuildings B.thetwowords C.thepeople D.thetwintowers 4TheexampleofTERRORSTRIKESisusedtosupporttheviewthat. A.agoodheadlinetellsasmuchaspossibleinashortspace B.newsheadingoftenfocusonthecentralandmostimportantnewsinformation C.agoodheadlineisnotmarkednecessarilybytheamountofinformationinit D.newsheadlinesarefeaturedbythevividlanguage

民间艺人制作糖画时先将白糖填写物态变化名称成糖浆用勺舀起糖浆在光滑的大理石板上绘制蝴蝶鱼等图案等石板上的糖浆选填吸收或放出热量后就凝固成了栩栩如生的糖画．

假定你是李华.你们班的外教Smith先生即将回国.你将代表全班在欢送会上发言.请你用英文发言稿内容包括 1.赞扬Smith的人品和工作. 2.感谢他在学习和生活中给予的帮助. 3.表达对Smith的祝福. 注意1.词数100左右.发言稿的开头已给出不计入总词数. 2.可适当增加细节使行文连贯. DearMr.Smith It'shardtosaygoodbye.Wordscannotconveyourendlessloveandthankstoyouforyou'vedonesomuchforusintheseyears. .

在平面直角坐标系中已知AB垂直于y轴点A的坐标为32并且AB=5则点B的坐标为

△ABC中AB＝5AC＝40＜λ＜1且则的最小值等于

已知函数fx＝ex+e﹣x则下列结论正确的是

假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改的词. 注意1.每处错误及其修改均限一词2.只允许修改10处多者从第11处起不计分. Ialwaysdreamlifeinthefuture.Whatwillitbelike? Perhapssomepeoplewillgotothemoonfortheholidaysandsomepeoplemayliveundertheseaandinpace.Besidesprobablythere'llbemoreeducationalprogramontheInternet.Andthereforestudentswillbeabletostudyathomeinsteadofgotoschooleveryday.What'smoremaybeinthefutureeachfamilywillhavearobotthatwillbeabletodowhateveritwastoldtosuchasgoingtoshoppingdoinghouseworkandsoon. WiththebreakthroughoftechnologyIbelievethattheirlifewillcertainlybecomeeasierhappyandmorecolorful.

已知fx是定义在R上的偶函数且fx在0+∞内单调递减则

计算5a-2b2

2019年某饮料公司计划从AB两款新配方饮料中选择一款进行新品推介现对这两款饮料进行市场调查让接受调查的受访者同时饮用这两种饮料并分别对AB两款饮料进行评分现对接受调查的100万名受访者的评分进行整理得到如下统计图．从对以往调查数据分析可以得出如下结论评分在[060的受访者中有20%会购买评分在[6080的受访者中有60%会购买评分在[801000]的受访者中有90%会购买． Ⅰ在受访的100万人中求对A款饮料评分在60分以下的人数单位万人 Ⅱ现从受访者中随机抽取1人进行调查试估计该受访者购买A款饮料的可能性高于购买B款饮料的可能性的概率 Ⅲ如果你是决策者新品推介你会主推哪一款饮料并说明你的理由．

WhenyouthinkofphotographingpeopleyoumaythinkofyourfamilyreunionortheChristmaspartyatwork.Thesetypesofpicturesofpeoplearerecordsoffuneventswithnicememories.Let'stakealookatanotherideafortakingpicturesofpeoplewithanentirelydifferentslant. Muchasanthropologists人类学家studythediversityofcharacteristicsofpeopleinculturalandenvironmentalcontextssomephotographersrecordtheseaspectsofpeopleintheirpictures.Theycrytocapturetheemotionsandhumanityofpeopleandthephotographdrawstheviewerintothesubject'sexperienceatthatmomentintime. Takingpicturesofpeoplewiththisgoalinmindmakesthephotographerandtheviewergrowintheunderstandingofhumannature.Forexampleaphotographofayoungmantryingtohitcharide搭便车intheraincanshowtheexperience.Hisponcho雨布sparkleswiththeraindropsflowinginasteadystreamtotheground.Thelightsofpassingtraffichighlightthecontrastbetweenthewarmdrydriverstakingnonoticeofhistrouble.Anotherpictureofachildsleepingonabenchatabusytrainstationcancapturetheinnocenceofchildhoodcontrastedwithabusyworldofhurriedgrown﹣ups. Ifyou'dliketoexperimentwiththisformofphotographsofpeoplelookforordinarypeopleincontrastingenvironmentsorcontexts.Childrenandtheelderlyposeextraordinarypossibilities.Thelinedfacesoftheagedoftenmakegreatsubjectsreflectingcharacterandwisdom.Peoplearesuchinterestingsubjects.Facialexpressionscanconveyathousandmoodsandfeelings. Takingpicturesofpeoplewithaneyetothefeelandmagicofthemomentwillmakeyouabetterandmoreenthusiasticphotographer.Youmayfindyourselfsotakenwiththisnewexperience.Photographingpeopleisanartfulendeavor.Taketheleap! 28.Thesecondparagraphmainlyshowsthatsomephotographersaredoingsomething. A.easierthananthropologists'study B.moreinterestingthananthropologists'study C.similartoanthropologists'study D.differentfromanthropologists'study 29.Whatistheeffectofpicturesthatshowemotionsandhumanityofpeople? A.Helpingtoknowmoreaboutcultures. B.Helpingtoknowbetterabouthumannature. C.Helpingtoknowmoreaboutphotography. D.Helpingtoknowbetteraboutanevent. 30.WhatdoestheunderlinedpartinParagraph3indicate? A.Thedrivershavetodrivecarefullyintherain. B.Thedriversareluckytobewarmanddryintherain. C.Theyoungmanisfightingagainsttherain. D.Theyoungmanisinadifficultsituationintherain. 31.Whatissuggestedbytheauthor? A.Takingpicturesofcommonpeople. B.Takingpicturesofgreatevents. C.Teachingchildrenphotographing. D.Applyingoldpeople'swisdomtophotographing.

已知F是椭圆的右焦点直线与C相交于MN两点则△MNF的面积为

计算--2·-2-1

Somepeopledon'tliketogotothegym.Theydon'tliketogoforarunabikerideoraswim.Theydon'tliketothinkthey'reexercisingbecausetheythinkit'stoomuchlikehardwork.36 Thereareexercisesyoucandoathomethataregreatforburningcalories.37 ThefirstthingyoushoulddoisgetridofyourTVremotecontrol.Lockitupforawhile.Youwon'tneedit.InsteadofusingtheremotecontrolyouaregoingtophysicallygetupandwalkovertotheTVtochangethechannel.38Howmanytimesdoyouchangethechanneleveryday?Howmuchwalkingcouldyoudoifyoumanually用手操作changedthechannel?Youshouldn'tbewatchingmuchTVinthefirstplaceifyouwanttobelosingweightbutatleastmanuallychannelsurfingyouwillbeburningsomecalories. Secondlyyoucaneasilyburncalorieswhileyou'reonthephone.HowLongdoyouspendonthephoneeveryday?Perhapsanhourperhapstwoperhapsmore!39Youcan!Ifyouhaveacordlessphonethenwhiletalkingonthephoneyoucanbewalkingaroundthehousewalkingupthestairsordoinganyotherphysicalactivitythatwillcontributetoburningcalories. Thirdlylet'sgetoutofthehouseforamoment.40Gardeningisagreatcardiovascular心血管的activitythat'sgreatforburningcalories.Justwalkingaroundyourgardenplantingflowerstrimmingtreesandbushesdiggingupthegroundcancontributetoburningcaloriesandrememberitalladdsupsodowhateveryoucantolosethosecalories. A.Andthebestthingisyouwon'trealizethatyou'redoingit. B.Surelyitiswrongofyoutothinkthisway. C.Let'sgotothegardenanddosomegardening. D.Whatabouttalkinglessonthephone? E.Whatifduringthistimeyoucouldbeexercising? F.Areyouoneofthosepeople? G.Thismightsoundstupidbutthinkaboutit.

如图所示点A的坐标为点A关于x轴的对称点B的坐标为点B关于y轴的对称点C的坐标为

HuoZunisverypwiththeyoungstudents.

假定你是李华昨天一个外宾参观团来你校参观.他们走后你们在他们所待过的学校会议室里发现一个手提包并根据包内物品英文报纸英镑断定失主是他们其中一位.现由你写信给这次所结识的外宾参观团成员格林先生请他帮忙为你们找到失主并询问还包的方式. 注意1.词数100左右 2.可以适当增加细节以使行文连贯. .

把一块长方形的菜地分成大小不同的几部分其中甲占总面积的20%乙占总面积的丙是30平方米丙与甲的面积比是73求阴影部分的面积．

利用因式分解计算20192-2018×2020

某校高一年级开设了丰富多彩的校本课程现从甲乙两个班随机抽取了5名学生校本课程的学分统计如表 用S12S22分别表示甲乙两班抽取的5名学生学分的方差计算两个班学分的方差S22＝并由此可判断成绩更稳定的班级是班．

函数y=-的自变量取值范围是A．x＞0 B．x＜0 C．x≠0 D．x≠-1

1把下面梯形分成三个三角形使这三个三角形的面积的比是1232在下面方格纸的右边画一个面积为24cm²长方形它的长和宽的比为32

某花卉批发市场为丰富居民生活特举办花卉展销活动其中绿色观赏植物从AB两家经销商分别抽取10株进行展销经测量其株高如下单位cm A25374041221439194221 B21392942403818371927 ⅠAB哪家植物长得较高哪家植物长得比较整齐 Ⅱ市场决定从两家不低于40cm的植物中随机选取3株参加优质品种展销求3株中恰有2株选在A家的概率．

已知函数fx＝alnx﹣x2+2a﹣1x其中a∈R． Ⅰ当a＝1时求函数fx的单调区间 Ⅱ求函数fx的极值 Ⅲ若函数fx有两个不同的零点求a的取值范围．

已知集合A＝{x|x+1＞0}B＝{x|log2x＜1}则A∩B＝

2018年9月24日阿贝尔奖和菲尔兹奖双料得主英国著名数学家阿蒂亚爵士宣布自己证明了黎曼猜想这一事件引起了数学界的震动在1859年德国数学家黎曼向科学院提交了题目为论小于某值的素数个数的论文并提出了一个命题也就是著名的黎曼猜想．在此之前著名数学家欧拉也曾研究过这个问题并得到小于数字x的素数个数大约可以表示为nx的结论素数即质数lge≈0.43429．根据欧拉得出的结论如下流程图中若输入n的值为100则输出k的值应属于区间

分解因式16x³-9xy²

当x时分式的值为负数．

阅读下面材料在空白处填入适当的内容1个单词或括号内单词的正确形式. ChinesepeopleoftenburytheashesoftheirlatelovedonestoshowrespectforthemonTombSweepingDaywhichnormally61fallonApril5everyyear.Itisadayforpeopletovisittheirancestor'stombsandhonorthemby62burnpaperofferings.Chinesepeopletraditionallybelievedthatsoulswillrestinpeace63theirbodiesarecoveredbysoilwhichwasconsideredmorerespectto64dead. Butattitudetowardsburialshaschanged.NowChineseare65increasingchoosingseaburialsinwhichashesaccompaniedwithflowerpetals花瓣arethrownintothesea.Oldpeopledonotcarehowthey66buryafterdeathwhattrulymattersto67theyisthehappinessoftheirchildren. Havinganenvironmentallyfriendlyburialhasbecomeimportantformanypeople.China'slatestpolicyonburialsencourageseco﹣burialsincludingseaandtreeburials68makeaharmoniousrelationshipbetweenhumans69nature.Eco﹣burialssavelandreducefuneralexpensesanddolessharm70theenvironment.

直线y＝m与直线y＝2x+3和曲线y＝ln2x分别相交于AB两点则|AB|的最小值为．

如图是一块木料的三视图将它经过切削打磨成半径最大的球则该木料最多加工出球的个数为