首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
已知，则分式=
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
已知分式乘另一个分式后的结果为则这个分式为．
已知分式要使分式的值等于零则x等于
﹣1
1
﹣2
2
已知分式÷及一组数据-2-1120．1从已知数据中随机选取一个数代替x能使已知分式有意义的概率是多少
已知分式x取哪些值时1分式的值是正数2分式的值是负数3分式的值是零4分式无意义
已知分式当x=5时分式的值为零求a的取值范围当x取任何值时这个分式一定有意义求a的取值范围
已知x=-2时分式无意义x=4时此分式值为0则a+b=_______________.
已知分式当x＝2时分式无意义则a＝当a
已知则分式的值等于__________
已知分式当x=时分式没有意义当x=时分式的值为0当x=2时分式的值为．
已知分式x取哪些值时1分式的值是正数2分式的值是负数3分式的值是零4分式无意义
已知分式当x=﹣5时该分式没有意义当x=﹣6时该分式的值为0则m+n2015=.
已知分式当x=2时分式的值为0当x=1时分式无意义则m+n=．
已知分式:当x=_时分式没有意义当x=_______时分式的值为0当x=－2时分式的值为______
已知当x=－2时分式无意义当x=6时此分式的值为0则.
已知分式当x=2时分式无意义则a=
已知分式满足条件只含有字母x且当x=1时无意义请写出一个这样的分式.
已知当x=-2时分式无意义x=4时此分式的值为0则a+b=.
已知分式及一组数据﹣2﹣112． 1从已知数据中随机选取一个数代替x能使已知分式有意义的概率是多
已知分式当x=2时分式无意义则a=
已知x=-2时分式无意义x=4时此分式值为0则a+b=_______________.
热门试题
更多
Havingbattledwiththeiroverwhethertoofferhelptoanagedmanorwomanwhohasfallenovermostpeoplechoosetohelp. A.compromise B.contradiction C.conscience D.competence
1Whatmustyoudoifyoudriveane﹣bikelegallyinChangzhouafterApril152019?A.Buyanewe﹣BikemeetingthenewnationalstandardbeforeApril15209.B.Paytoregisteryourunlicensede﹣BikebeforeApril152019.C.Takeoutthird﹣partyliabilityinsuranceforyoure﹣BikebeforeApril152019.D.Obtainane﹣BikenumberplateoratemporarypermitcurdbeforeApril152019.2Fromtheannouncementweknowthat.A.thetransitionperiodforregistrationisfiveyearslongB.sixillegaltrafficbehaviorswillbespeciallyinvestigatedC.hightechnologywillbeusedforlawenforcementonthespotD.theannouncementismadeforthesakeofeconomicdevelopment
Addingtotheirhappinesshesayssomesimilaritiesbetweenthetwotestpapers.A.is B.are C.has D.have
﹣Thedressonthefashionshowisreallybeautiful! ﹣Youbet.Don'tyouthinkitwillsoonafteritisputontothemarket? A.carryon B.callon C.counton D.catchon
AmongallthetouristattractionsinSydneythemagnificentOperaHouseistheshiningstar.OntheedgeofBennelongPointatongueoflandstickingoutintoSydneyHarborthisUNESCOWorldHeritageSiteconsistsofacomplexofroofsshapedlikehugeshellsorbillowingsailsthatmixbeautifullywithitswaterfrontlocation.Todayvisitorscanadmirethegreatbeautyofthebuilding.Muchmorethananoperahousethestructureencompasses包含theatersstudiosaconcerthallrehearsalandreceptionroomsrestaurantsandaspectacularopen﹣airforecourtoverlookingtheharborandcity.AmericanarchitectLouisKahnoncesaid'Thesundidnotknowhowbeautifulitslightwasuntilitwasreflectedoffthisbuilding.'TipsandTacticsBookseatsforproductionswellinadvance.Performancescommencepromptlysovisitorsshouldallowenoughtimetoaccessthebuildingcollectticketsandstowcloakslargebagsandjackets.Considerenjoyingamealinoneoftherestaurantstoenjoythestunningharborviews.OneofthebestsitestophotographtheOperaHouseisMrs.Macquarie'sChairintheRoyalBotanicGardensorfromthewateraboardaharborcruise.GettingtotheSydneyOperaHouseVisitorscancatchaSydneyBustravelbyCityRailorhopaboardaSydneyFerrytoCircularQuaywhichisa5to7minutewalkfromtheSydneyOperaHouse.Afreeshuttlebusforelderlyandmobility﹣challengedpatrons顾客runsbetweenCircularQuaynearStandEundertheCahillExpresswayandtheVehicleConcourse.BikeparkingisavailableundertheSydneyOperaHouseMonumentalSteps.Wilson'sSydneyOperaHouseCarParkislocatedat2MacquarieStwithvehicleaccessnexttotheSydneyOperaHouseForecourt.AdmissionTicketpricesvaryfromattractiontoattraction.LocationBennelongPointSydney.1WhichofthecharacteristicsofSydneyOperaHousemightattractvisitorsmost?A.Itshistoricalcontext.B.Itsuniquearchitecture.C.Itswaterfrontlocation.D.Itssuperbharborviews.2IfyouareavisitortoSydneyOperaHouseyoucan.A.takeaferrydirectlytoSydneyOperaHouseB.rideafreeshuttlebuswithoutanyrestrictionsC.takeanequallygoodphotofromanyangleD.driveacarto2MacquarieStandparkthere
TheurgetoshareourlivesonsocialmediaPeoplehavelongusedmediatoseereflectionsofthemselves.Longbeforemobilephonesorevenphotographydiarieswerekeptasawaytounderstandoneselfandtheworldinwhichonelives.Inthe18thand19thcenturiesasdiariesbecamemorepopularmiddle﹣classNewEnglandersparticularlywhitewomenwroteabouttheireverydaylivesandtheworldaroundthem.Thesediarieswerenotaplaceintowhichtheypouredtheirinnermostthoughtsanddesiresbutratheraplacetochronicle记录thesocialworldaroundthem.Thediariescapturedtheeverydayroutinesofmid﹣19th﹣centurylifeandwomendiaristsinparticularfocusednotonthemselvesbutontheirfamiliesandtheircommunities.Diariestodayareforthemostpartprivate.ButthingsweredifferentfortheseNewEnglanddiaries.Youngwomenwhoweremarriedwouldsendtheirdiarieshometotheirparentsasawayofmaintainingkin血缘relations.Whenfamilyorfriendscametovisititwasnotuncommontositdownandgothroughone'sjournaltogether.Diariesarenottheonlymediathatpeoplehaveusedtodocumentlivesandsharethemwithothers.Wehavelongusedmedialikephotoalbumsbabybooksandevenslideshowsasameansofcreatingtraces痕迹ofourlives.Wedothistounderstandourselvesandtoseetrendsinourbehaviour.Wecreatetracesaspartofouridentityandpartofourmemory.Sharingeverydaylifeeventscanstrengthensocialconnectionandintimacy亲密感.Forexampleyoutakeapictureofyourchild'sfirstbirthday.Itisnotonlyadevelopmentalmilestonethephotoalsostrengthentheidentityofthefamilyunititself.Theactoftakingthephotoandproudlysharingitfurtherreaffirms再次证实oneasagoodandattentiveparent.notherwordsthemediatracesofothersfigureinourownidentities.Today'ssocialmediaplatformsarebyandlargefreetouseunlikehistoricaldiarieswhichpeoplehadtobuy.Todayadvertisingsubsidizes补贴ouruseofnetworkedplatforms.Thereforetheseplatformsencourageuseoftheirnetworkstobuildlargeraudiencesandtobettertargetthem.Ourpicturesourpostsandourlikesarecommodified﹣﹣thatistheyareusedtocreatevaluethroughincreasinglytargetedadvertising.Insteadofsocialmediamerelyconnectingusithasbecomeacraze狂热forinformationcontinuallytryingtodrawusinwiththepromiseofsocialconnectivity﹣﹣it'ssomeone'sbirthdaysomeonelikedyourpictureetc.There'samultibillion﹣dollarindustrypullingusintooursmartphonesrelyingonalongstandinghumanneedforcommunication.Theurgetobepresentonsocialmediaismuchmorecomplexthansimplynarcissism自恋.Socialmedidofallkindsnotonlyenablepeopletoseetheirreflectionsbuttofeeltheirconnectionaswell.
TherearehundredsofscenesinEnglishnovelscharacterswalkthroughalandscapeoffallenleaveswhichmirrorsthefeelingsofthecharacters. A.which B.where C.that D.when
﹣Shallwegototheseveno'clockperformanceortheeight?﹣suitsyoufine.A.Whatever B.Whichever C.Whenever D.Wherever
Ourhomegalaxy星系theMilkyWaymakesforaprettyspacepictureanditlooksnormalatadistance.Butanew3Dmaprevealsasurprise_____.TheMilkyWayisaspiral漩涡型的galaxyinwhichstarsandgascloudsexistmainlyinitsspiral'arms'.OurmassiveneighbortheAndromedagalaxy仙女座isalsospiral.Spiralgalaxiesusuallyappearveryflatandeasytoseethroughatelescopesaidtheresearchers.Using1339largepulsating脉冲的starstomakea3DmapoftheMilkyWayresearchersdiscoveredinsteadthatthegalaxy'sdiskofstarsisincreasinglytwistingmostlikelyduetothespinningofthedisk.Andthefartherthestarsarefromthecenterthemoretwisteditbecomes.Previouslyastronomerssawevidenceofhydrogencloudsbecomingwarped弯曲的intheMilkyWayThisisn'tcompletelyabnormalbecauseastronomershavenoticedthesamepatternofprogressivelytwistingspiralsinaboutadozenothergalaxies.Butitdoeshelpthemmakemoresenseofourgalaxy.Becauseweliveinthisgalaxythatmakesithardertoobserveanddustandstarlightmakeitevenmoredifficultwhenusingtelescopes.Tryingtodeterminewhatourgalacticcenterlookslikeissimilartotryingtofindthecenterofaforestyou'restandingin.'ItisextremelydifficulttodeterminedistancesfromtheSuntopartsoftheMilkyWay'soutergasdiskwithouthavingaclearideaofwhatthatdiskactuallylookslike'leadstudyauthorXiaodianChenoftheChineseAcademyofSciencesinBeijingsaidinastatement.FromafartheMilkyWayappearslikeathinrotating旋转的diskofstarsorbitingthecentereveryfewhundredmillionyears.Inthecenterhundredsofbillionsofstarsanddarkmatterholdthegalaxytogether.Butasyoumovetowardtheoutermostreachesofthegalaxythegravitationalglueofthecenterfades.IntheouterdiskthiskeepshydrogengasfrombeingrestrictedwhichcontributestoanS﹣shapedwarping.'Somewhattooursurprisewefoundthatin3Dourcollectionof1339starsandtheMilkyWay'sgasdiskfolloweachotherclosely.Thisoffersnewinsightsintotheformationofourhomegalaxy'RicharddeGrijsseniorstudyco﹣authorandprofessoratMacquarieUniversity'sDepartmentofPhysicsandAstronomysaidinastatement.'PerhapsmoreimportantlyintheMilkyWay'souterregionswefoundthattheS﹣likestellar星的diskiswarpedinaprogressivelyTwistedspiralpattern.'Sothemassiveinnerdisk'srotationalforcecausestheouterdisktowarptheresearchersconcluded.'Thisresearchprovidesacrucialupdatedmapforstudiesofourgalaxy'sstellarmotionsandtheoriginsoftheMilkyWay'saidLicaiDengco﹣authorandseniorresearcherattheChineseAcademyofSciencesinastatement.1Whichofthefollowingmightbethemissingsentenceinthefirstparagraph?A.TheMilkyWayisbeingwarpedandtwistedbyitsstars.B.TheMilkyWayisspiralandorbitingitselfallthetime.C.Theformationofourhomegalaxyisduetotheforceofgravity.D.TheoriginoftheMilkyWayliesinitsrotationalforce.2Whatdoestheunderlined'this'referto?A.theMilkyWayB.thegravitationalglueC.thefadingofgravityD.theoutermostreachofthegalaxy3Whichofthefollowingistrueaccordingtothepassage?A.Thegalaxyweliveinisuniqueforitsspecialspirals.B.ThestarsinthecenteroftheMilkyWayaremoretwisted.C.Thedistancefromthesuntootherstarsisalreadyknowntoscientists.D.TherotationofitsinnercenterforcestheMilkyWaytotwist.4Whatisthesignificanceofthisfinding?A.ItrevealswhytheMilkyWayisaflatandspiralgalaxy.B.Itleadstoabreakthroughofusing3Dtechnologyinspaceresearch.C.ItprovesapreviouswayofobservingtheMilkyWaywhilewearelivinginit.D.ItcontributestoourknowledgeabouttheMilkyWay.
﹣Whatwouldyouliketodothisweekend? ﹣.It'suptoyou. A.Whatever. B.Definitely. C.Goahead. D.Goodidea.
Thecouplewasinitiallylookingforwardtohavinganoverseasweddingbuthadtodroptheideaafterfacingfromparents. A.recognition B.toleration C.opposition D.proportion
Canetoadsalsoknownasbuffotoadsareyetanotherinvasive入侵speciesthathasfoundahospitablehomeinwarmsouthernFlorida.DeliberatelyintroducedfromSouthandCentralAmericainthe1930stheyweresupposedtocontrolbeetlesdamagingthesugarcanecrop﹣that'showtheygotthename'canetoads'.Canetoadscanposeaparticulardangerbecausetheadultonesshoottoxin毒素fromtheirbackwhenattacked.Thetinytoadsdon'tcarryenoughtoxintobedeadlyyetbutbigadultonescaneasilysendadogintoaseizure疾病发作orevenkillit.Thetoxinis'veryviscousandwouldstickinsidethedog'smouth'saysSteveJohnsonawildlifeecologistattheUniversityofFlorida.Ownersshouldtrytowipeoutanaffecteddog'smouthandimmediatelytakeittothevet.TilfordstartedToadBustersin2017.Thewomanwholivedtherehadninecatswhichshefedbydumpingalmostabagofcatfoodeverynight.Canetoadsnormallyeatbugsbuttheyarehappytoeatpetfoodtoo.CanetoadshaveadaptedbeautifullytotheFloridasuburbssoalotofTilford'sworkalsoinvolvesgettingpeopletorethinktheirsuburbanbackyard.Nomorecatfood.forexample.Petpoop粪便canalsoattractinsectswhichcaninturnattracttoads.AsdolightsAndtoadslovetobreed繁殖inattractivepoolsofwatersuchasthelakeintheaffectedPalmBeachGardenneighborhood.For'theselargercommunitiesthatwanttobuildthesebeautifulpondsandwanttohavehousesonponds'Tilfordsaid'thisisalmostapest﹣controlservice.'Thecanetoadsaren'tgoingawaybuttheycanbemanagedlikemosquitoesorrats.DealingwithtoadsamountstoanannoyingthinginFloridabuttheycanalsocreatemoredramaticproblems.InAustralia﹣wheretheywerealsodeliberatelyintroducedinthe1930stoprotectsugarcane﹣theyareagenuinescourge灾祸.TheissueisthatAustraliahasnonativetoadspeciessononeofthepredators食肉动物knewhowtoavoidthetoxictoads.Asthecanetoadsadvancedeasttowestacrossthecontinent'theyleftawakeofdeadanimalsintheirpaths'saysSeanDoodyanecologistattheUniversityofSouthFloridaatSt.PetersburgwhohasstudiedcanetoadsinAustralia.Turtleslizardsandcrocodilesjuststarteddyingoutwhichwasgoodnewsfortheirprey受害者'Ifyouwereasmallspeciesthatwaspreviouslybeingeatensuddenlyyou'reonahoneymoonsaysRickShineabiologistatMacquarieUniversityinSydneyAustraliawhohasalsostudiedtheimpactofcanetoadsonAustralianwildlife.1Whatcancanetoadsbedescribedas?A.InvasivespeciesintroducedtoSouthAmerica..B.NaturalenemiesofbeetlesdamagingsugarcaneC.Dangerousspeciesmakingactiveattacksondogs.DAgreatthreatpresentedtosomewildlifeecologists.2WhichmightbetheproperwayofavoidingcanetoadsaccordingtoTilford?A.Abandonthesuburbanbackyard.B.Lightupthebackyardatnight.C.Controlthenumberoflargehouses.D.Keeppetfoodawayfrombackyard.3WhathappenedinAustraliaaftercanetoadsbeingintroduced?A.Canetoadsdestroyedsomefoodchains.B.Mostofthepredatorsdiedoftoadtoxin.C.Canetoadsbredatamuchslowerpace.D.Bigspecieslearnedtoavoidcanetoads.
﹣ShouldIaskthebossifhe'supsetatmycominginlateinthemornings? ﹣Ifhehasn'ttsaidanythingaboutitjust. A.letsleepingdogslie B.strikewhiletheironishot C.putyourselfinhershoes D.killtwobirdswithonestone
Thetechindustryexpowhichattractedmorethan180000peoplewasareminderofthetechindustryisbestatbeingoptimisticaboutitself. A.that B.how C.what D.which
﹣LookingbackoninyearsgonebyandthegoodtimethatIhadmakestodayseemrathersad.﹣Absolutely.Somuchhaschanged.A.howitwas B.whoitwas C.howwasit D.whowasit
BeingsoathleticandcourageousHuaMulanwasn'tofmostyoungwomenofher. A.guilty B.cautious C.typical D.skeptical
﹣WhorecommendedNancyforthepost?﹣ItwasJamesadmirationforherwasobvious.A.who B.that C.whose D.whom
Thoughourfootballboysarefacedwithfourgoalsbehindtheyarestillstrugglinghardinthefieldto. A.facethemusic B.saveface C.costtheirarmandleg D.landontheirfeet
Withpeoplepayingattentiontofitnessself﹣servicemini﹣gymseachcoveringabout5squaremetersinChina'smajorcitiestheseyears. A.havesprungup B.sprangup C.hadsprungup D.springup
WeofferedtopayourhalfofthecostthatwasneededtorestoretheshareddoorwaybutCharleswouldhaveofit. A.nothing B.anything C.none D.any
Officefurniturelikechairsandsofasshouldbeattractiveaswellascomfortable. A.manually B.visually C.physically D.securely
﹣Iwonderwhatchancethereisofmepassingbytheoldplaceswithoutthinkingofyou.﹣.Timecuresallwounds.A.Mypleasure B.Don'tmentionit C.Ican'tagreemore D.Nevermind
Youngcoupleswillbehappytoseetheirbabieswithgoodhealthandintelligencewhentheyareborn. A.tobless B.blessing C.blessed D.beingblessed
Moreandmorepeopleprefertoliveinthecountrysideappealforthemliesinthequietandslow﹣pacedlife. A.who B.which C.whose D.what
Theexplosioninthechemicalplantavoidedhadthecountyauthoritiesaimingtoomuchatshort﹣terminterestsperformedtheirdutiesfromthebeginning.A.shouldbe B.mightbe C.musthavebeen D.couldhavebeen
Whatthecountrydidtheinternationaltraderegulationsforwhichitwaswidelycondemned.A.approved B.violated C.bothered D.interrupted
Wecompletedonethirdoftheprojectandtheloaninplacewehadtodelaytheresttillthenextmonth. A.notarranged B.wasnotarranged C.notarranging D.hadnotbeenarranged
﹣IsitenoughtofinishtheformforapassportMadam? ﹣Yourpassportapplicationformshouldbebytworecentphotos. A.updated B.accompanied C.established D.identified
﹣WhichclassicalChinesepoemdoyoulikebest?﹣Don'tlaughifwelaydrunkenonthebattlegroundhowmanysoldiersevercameback.A.oldandyoung B.upanddown C.safeandsound D.rightandwrong
Humanloveisn'tneatlyorderedoreasilypredictable.Butthatdoesn'tmeanthatmathematicshasn'tgotsomethingbecauseloveaswithmostoflifeisfullofpatterns.Mathematicsisbasicallyallaboutthestudyofpatternpatternsfrompredictingtheweathertothefluctuations起伏inthestockmarkettothemovementoftheplanetsorthegrowthofcities.Andifwe'rebeinghonestnoneofthosethingsareexactlyneatlyorderedandeasilypredictableeither.SoletustalkabouthowtopickaperfectpartnerusingahitofmathematicsthatiscalledOptimalStoppingTheory.Imaginethatyoustartdatingwhenyou're15andideallyyou'dliketobemarriedbythetimethatyou're35.Andthere'sanumberofpeoplethatyoucouldpotentiallydateacrossyourlifetimeandthey'llbeatvaryinglevelsofgoodness.Themathsaysthenthatwhatyoushoulddointhefirst37percentofyourdatingwindowyoushouldjustrejecteverybodyasseriousmarriagepotential.Andthenyoushouldpickthenextpersonthatisbetterthaneverybodythatyou'veseenbefore.Ifyoudothisitcanbemathematicallyproveninfactthatthisisthebestpossiblewayofmaximizingyourchancesoffindingtheperfectpartner.ButunfortunatelyIhavetotellyouthatthismethoddoescomewithsomerisks.Forinstanceimagineifyourperfectpartnerappearedduringyourfirst37percent.Nowunfortunatelyyou'dhavetorejectthem.Nowifyou'refollowingthemathsI'mafraidnooneelsewillappearthat'sbetterthananyoneyou'veseenbeforesoyouhavetogoonrejectingeveryoneanddiealone.Okayanotherriskislet'simagineinsteadthatthefirstpeoplethatyoudatedinyourfirst37percentarejustincrediblydullboringterriblepeople.Nowthat'sokaybecauseyou'reinyourrejectionphase.Butthenimaginethenextpersontocomealongisjustslightlylessboringdullandterriblethaneverybodythatyou'veseenbefore.NowifyouarefollowingthemathsI'mafraidyouhavetomarrythemandendupinarelationshipwhichisfranklynotmostsatisfying.Okaysothismethoddoesn'tgiveyoua100percentsuccessratebutthere'snootherpossiblestrategythatcandoanybetter.AndactuallyIalsothinkthatsubconsciouslyhumanswedosortofdothisanyway.Wegiveourselvesalittlebitoftimetoplaythefieldgetafeelforthemarketplaceorwhateverwhenwe'reyoung.Andthenweonlystartlookingseriouslyatpotentialmarriagecandidatesoncewehitourmid﹣to﹣late20s.Ithinkthisisconvincingproofifeveritwereneededthateverybody'sbrainsareprewired天生的tobejustalittlebitmathematical.Thereforeitcanbemathematicallyproventhatthisisthebestwaytofindtheperfectpartner.
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
教案备课库
教案备课库
教案备课库
湘公网安备 43130202000226号