在（2x﹣）n的展开式中，各项系数和与二项式系数和之比为1：64，则展开式中常数项为（　　）

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

计算2a-b²-b²

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

计算-x²+2x+3²

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.

计算15x3y2z4÷3x4yz3÷4x2y

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．

计算-x²y·-xy²z

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

在一次军事演习行动中距目的地105km的某驻军__接到命令立即驱车前往出发50min后中途遇山体滑坡道路阻断经2h抢通道路继续前进40min到达指定地点则__全程平均速度应为km/h

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．

某同学乘坐着汽艇遥对一座高崖他向高崖鸣笛历时5s听到汽笛的回声．求1若汽艇静止在水面他离高崖多远2若汽艇以10m/s的速度正对高崖驶去他鸣笛时离高崖多远

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

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

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. .

Theyplantogotothebestplacelunch.A.have B.tohave C.having D.had

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

甲同学骑自行车去看望乙同学得知消息后乙同学步行去迎接接到后同车返回整个过程他们的位置与时间的关系如图所示据图可知A．两同学在t=10min时相遇B．相遇前甲的速度是乙的4倍C．相遇后乙的速度是原来的1.5倍D．整个过程乙的平均速度是甲的2倍

△ABC中AB＝5AC＝40＜λ＜1且则的最小值等于

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

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.

计算

计算--2·-2-1

如图所示编钟是我国古代音乐文化的杰作古代工匠运用高超的工艺铸造出大小不同的编钟这些编钟在用大小相同的力敲击时能发出不同的声音这是由于不同的钟在敲击后振动的不同

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

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．

—Ishere?—No.Alanisstillontheway.

分解因式16x³-9xy²

提取抗生素时要用加热的方法使水沸腾而除去水分但抗生素不能在超过80℃的温度下提取应采用的方法是A．用微火加热B．降低容器内的气压C．缩短加热沸腾时间D．增加容器内的气压

Whenpeoplewatchtheshowtheyusuallyplayaroleindecidewhoisthefirstone.

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.

计算ab²³·ab²²