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已知二次函数y=2x2-8x+61将二次函数化成顶点式为2当-＜x＜3时y的取值范围是3该二次函数关于x轴对称的二次函数解析式为4不等式2x2-8x+6＜0的解集为
西周时期丞相周公旦设置过一种通过测定日影长度来确定时间的仪器称为圭表．如图是一个根据北京的地理位置设计的圭表其中立柱AC高为a．已知冬至时北京的正午日光入射角∠ABC约为26.5°则立柱根部与圭表的冬至线的距离即BC的长约为
为了了解湖南各景点在大众中的熟知度随机对15～65岁的人群抽样了n人回答问题“湖南省有哪几个著名的旅游景点”统计结果如下图表． Ⅰ分别求出abxy的值 Ⅱ从第234组回答正确的人中用分层抽样的方法抽取6人求第234组每组各抽取多少人 Ⅲ在Ⅱ抽取的6人中随机抽取2人求所抽取的人中恰好没有第3组人的概率．
某程序框图如图所示若输出的S＝26则判断框内应填
计算．-13×-0.34×+×-13-×0.34
已知向量＝sinxcosx＝cosxcosx＝21 1若求sinxcosx的值 2若0＜x≤求函数fx＝m•n的值域．
假定你是李华你校将举办国际中学生冬令营活动你是负责人之一.你的英国朋友Joe来信想了解一些有关信息.请你根据以下内容用英语给他回一封信. 地点南昌 活动时间2019年6月23日﹣29日 参加人员60名来自世界各地的高中生活动内容游览江西名胜体验中国文化品尝当地美食相互学习交流 注意事项2019年6月21日前用e﹣mail确认参加 注意1.词数100左右开头和结尾已给出但不计入总词数 2.可以适当增加细节以使行文连贯.
在2×－4×5＝2×5×－4中运用了．
HowtoDiscoverYourTalent Talenttendstorefertothatinbornskillthateveryoneseemstobebornwith.1.It'sgoodtotryandidentifyandpracticethatskill. Revisityourchildhood.Agoodwaytofigureoutwhereyourtalentslieistogobacktoyourchildhood. 2.Thisisoftenthetimewhenyouhadplansthatweren'tlimitedbywhatpeopletendtothinkofas‘reality'. Considerwhatitisyoudowhenyoulosetrackoftime.Oneofthechiefthingsyoucandoisfocusonwhatyoulovetodosomuchthatyouhaveatendencytoforgeteverythingelseforawhile.3.Youmighthavetoresearchabitdeeperintothethingsyouenjoytodiscoverwhatmakesyoufeelsatisfied. 4.Sometimeswhenyou'rehavingdifficultyseeingclearlyit'sgoodtogetanoutsideopinion.Yourfriendsandfamilymembersknowyouwellandtheyshouldbeabletoofferyousomeinsightsintotheareastheythinkyou'retalentedin. Trynewthings.Especiallyifyou'renotsurewhatyourtalentsmightbeyoushouldgetoutandtrynewthings.Thiswayyou'remorelikelytohitonwhatitisthatyou'rereallygoodatandthatreallymakesyouhappy.5.Inyourquestforyourowntalentyoushouldlookintothetalentsofotherpeople. A.Considerwhatyoulovedtodoasachild B.It'struethathavingatalentcanhelpyouinlife C.Observeandenjoythetalentsofotherpeople D.Youcanuseyourtalentsintheserviceofkindness E.Focusontheareasthatyou'relesstalentedin F.Notalltalentsaregoingtobesuperobvious G.Askothersforbetteradvice
已知函数fx＝tan2x+则下列说法正确的是
Thegirlthebadnewstoherteacheralready.spread
Whenyoungpeoplebegintoliveindependentlyhome﹣huntingcanbedifficult.Buttheywoulddowelltorememberthatanewchoiceisavailable﹣﹣﹣micro﹣homes. Fondlycalledtinyhousesthesehouseshavealllivingnecessitiesinasmallpackageincludingkitchenbedroomandbathroom.Generallyunder50squaremetersmosttinyhousescanholdjustoneortwopeoplethoughsomeclaimthespaceformore.What'slostinsizeisnotlostindesign设计asthesehomesareoftenquitemodernindesign. Besidesanattractiveappearancetinyhousescanalsohavepracticalfeatures特点.Makingthebestofurbanspacethe72﹣to﹣122﹣centimeter﹣wideKeretHouseinWarsawtheworld'snarrowesthomefilledinanalley小巷.ThehomeEcocapsuleusessolarpowerwindpowerandrainwatercollectiontoenableitsownertolivepracticallyanywhere. Althoughmicro﹣homesareattractivethereareafewdisadvantagestoconsiderbeforegettingcomfortableonaminicouch.Movingintoatinyhouseyoushouldthrowawayunnecessarythings.Itisalsomostlyimpossibletoinviteguests.Andfinallyamicro﹣homeislikelyatemporary暂时的livingchoiceformostpeoplesincetheywillprobablystartfamiliesandownmorethings. Thoughthelimitationwillscaresomethereisusuallyabenefit.Asmallsizeresultsinlowpricesandsmallbillsmakingtinyhouseseasiertosaveupfor.Andthoughyouwon'thavemanythingsaroundthehouseitmakesiteasyandsimpletokeepitclean.Micro﹣homesarealsoeco﹣friendlywhichcan'tbematchedbyotherhomes.Theyprobablyaren'tforeveryoneorforeverbutwhenitcomestoyournextorfirsthometheycouldbejustwhatyouneed. 1Whatcanbelearntaboutmicro﹣homesfromParagraph2? A.Peoplecan'ttakeapackageintothetinyhouses. B.Allofthehousescanholdmorethantwopeople. C.Thesehousesareconvenientthoughtinyinsize. D.Suchhousesarepoorlydesignedduetothesmallsize. 2TheauthordevelopsParagraph3mainly. A.byexamples B.bycomparisons C.byorderinspace D.bycausesandeffects 3Micro﹣homesareespeciallysuitablefor. A.ayoungpersonwhohasmanythings B.apersonwhodoesn'thavemuchmoney C.acouplewhowanttoprotectenvironment D.afamilyhopingtosettledowninacity 4Whatcanbethebesttitleforthetext? A.Eastorwesthomeisthebest. B.Micro﹣homes﹣﹣﹣morethantiny! C.Home﹣hunting﹣﹣﹣noeasymatter! D.Tinyorlargethisisachoice.
如果3xy=0那么一定有
已知向量＝﹣55＝0﹣3则与的夹角为
Let'slookatthemovieswecan'twaittowatchin2019 DumboMarch29 Dumboisa1941AmericanfilmproducedbyWaltDisneyProductions.ThemaincharacterisanelephantwhoisnicknamedDumbo.Dumboisalwayslaughedatforhisbigearsandheisrejectedbytheotherelephants.Withnoparenttocareforhimheisalone.Butinfactheiscapableofflyingbyusinghisearsaswings.Alive﹣actionadaptationofthefilmdirectedbyTimBurtonisscheduledtobereleasedonMarch292019. Shazam!April5 ShazamisanupcomingAmericansuperherofilmbasedontheDCComicscharacterofthesamename.DirectedbyDavidF.SandbergthefilmissettostarAsherAngelasBillyBatsonateenageboywhocantransformviathemagicwordShazamintoanadultsuperheroplayedbyZacharyLevi.Itwillbethefirstfilmversionofthecharactersincethe1941seriesAdventuresofCaptainMarvelthecharacter'soriginalname. AladdinMay24 AladdinisafictionalcharacterandtheroleofthefilmAladdin1992basedonAladdinafolktaleofMiddleEasternoriginHeisvoicedbyScottWeingerwhilehissingingvoiceisprovidedbyBradKane.AladdinneverreceivedaformaleducationandhasonlylearnedbylivingonthestreetsofAgrabah.Hehastostealfoodinthelocalmarketinordertosurvive.MenaMassoudissettoplayalive﹣actionversionofthecharacterinaliveactionadaptationofthe1992film. 1Whichonewillbeshowntotheaudienceasaformoffilmforthefirsttime? A.Dumbo. B.Shazam! C.AdventuresofCaptainMarvel D.Aladdin. 2WhoistheactorofthenewestversionofAladdin? A.ScottWeinger. B.BradKane. C.TerryO.Morse. D.MenaMassoud. 3Onwhichdaycanyouwatchafilmaboutapitifulanimalaccordingtothetext? A.March29. B.April5. C.May24. D.May31.
如图是2016年在巴西举行的奥运会上七位评委为某体操运动员的单项比赛打出的分数的茎叶统计图去掉一个最高分和一个最低分后所剩数据的方差为．
若sinπ+A＝则cos+A＝
WheneverIvisithimheoftendifferentkindsoffruitstotreatme.A.laysout B.callsout C.leavesout D.clearsout
Thegirlisveryshyandsheisafraidtospeakto .stranger
在5-67-8这四个数中任取两个数相乘所得的积中最大的是
已知＝11＝3﹣1＝ab 1若ABC三点共线求ab的关系 2若＝2求点C的坐标．
计算×8--
Ican'teatmyfavoritesweetcakesbecauseI'mafraidtoonweighteasily.
360°化为弧度是
计算30×-+
设abc是三个有理数若a＜ba+b=0且abc＞0则a+c的符号为
如图△ABC中＝＝＝4用表示正确的是
Forthose1lovetravelparticularlyrailtravelChinain1987wasacan't﹣misskindofplace. In1987Chinawasstilloperatingsteamtrainsonsomerailrouteswhichmadepeoplefrommanycountriesamazed.BruceConnollyaphotographerfromScotland2beoneofthem. ConnollyfirstcametoChinain19873starthiscontinuoustravellingthroughoutChina.Sincethenhe4traveltomostpartsofChinaexceptFujianZhejiangandJiangxi.Whereverhewenthiscameraremainedbyhisside.DuringhisjourneysinChinaConnollyfoundChinaverydifferentfrom5hesawinphotographswhichshowedChinesepeoplevery6religioninthewaytheydressedandbehaved.Insteadwhathesawwasthatpeoplewere7friendwelcomingandworebrightclothes.IntheearlyyearsofhisjourneymostChinesepeoplewerefascinatedwithforeignersvisitingChinabutnowthathaschangedin8citysuchasBeijingandShanghaiforeignersarenolongercuriosities. AnotherdramaticchangethatConnollyhasfeltinChinais9widespreaduseofnewtechnology.Chinahasbecomeoneofthemosttech﹣savvy懂技术的societies.Peoplenowdoeverythingwith10theysmartphonesanduseofcashisalmostdisappearing.
学校新建的实验楼耗资180万元比原计划节约了60万元节约了百分之几
sin300°的值为
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