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我们知道方程的解是x＝．现给出另一个方程，它的解是 ．
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已知关于x的方程的一个解与方程的解相同.⑴求k的值⑵求方程的另一个解.
我们知道方程组的解是现给出另一个方程组它的解是
已知关于x的方程x2+kx﹣3＝0的一个解为1则它的另一个解是．
方程组的一个解为那么这个方程组的另一个解是
已知关于x的方程x2＋3x－m＝0的一个解为－3则它的另一个解是.
已知关于x的方程x2＋kx－2＝0的一个解与方程解相同.1求k的值2求方程x2＋kx－2＝0的另一个
已知关于x的方程x2＋kx－2＝0的一个解与方程解相同.1求k的值2求方程x2＋kx－2＝0的另一个
已知x=－2是一元二次方程x2+2x+a=0的一个解则此方程的另一个解是
x = 0
x = － 2
x = 2
x = － 14
已知关于x的方程的一个解与方程的解相同.⑴求k的值⑵求方程的另一个解.
若x=3是一元二次方程x2+mx+6=0的一个解则方程的另一个解是.
已知关于x的一元二次方程x2＋kx－2＝0的一个解与方程＝4的解相同.1求k的值2求方程x2＋kx－
已知关于x的方程2x2﹣mx+3=0的一个解是1求m的值和该方程的另一个解．
我们知道方程x2+2x﹣3=0的解是x1=1x2=﹣3现给出另一个方程2x+32+22x+3﹣3=0
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2
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x
1
=1，x
2
=﹣3
x
1
=﹣1，x
2
=3
x
1
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2
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我们知道方程组的解是现给出另一个方程组它的解是
若关于x的一元二次方程x2﹣2x+m=0有一个解为x=﹣1则另一个解为
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已知关于x的方程x2+kx-2=0的一个解与方程=3的解相同.1求k的值2求方程x2+kx-2=0的
我们知道方程组的解是现给出另一个方程组它的解是
我们知道方程组的解是现给出另一个方程组它的解是
若是一元二次方程的一个解则方程的另一个解是.
若x＝﹣2是关于x的一元二次方程ax2﹣4＝0的一个解则这个方程的另一个解是．
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如图是国家统计局今年4月11日发布的2018年3月到2019年3月全国居民消费价格的涨跌幅情况折线图．注2019年2月与2018年2月相比较称同比2019年2月与2019年1月相比较称环比根据该折线图下列结论错误的是
WhenOliverSacks82diedonAug30athishomeinNewYorkCitytheworldwassaddenedbythelossofabrilliantneurologist神经学者andatrulybeautifulmind. London﹣bornSackswasmostfamousforhiswriting.AForbesobituary讣告callshimoneofthegreatestwritersofscienceofthepast50years.Maybethegreatest. Inhisbest﹣selling1985bookTheManWhoMistookHisWifeforaHatSacksdescribedamanwhocouldnottellthedifferencebetweenhiswife'sfaceandhishatbecausehisbrainhaddifficultytellingwhathesaw. In2006Discovermagazinerankeditamongthe25greatestsciencebooksofalltimedeclaringLotsofneuroscientistsnowlookingintothemysteriesofthehumanbraincite列举thisbookastheirgreatestinspiration/ His1973bookAwakeningsisaboutagroupofpatientswhowerefrozeninadecades﹣longsleepuntilSackstriedanewtreatment.Thebookledtoa1990movieinwhichSackswasactedbyRobinWilliams.Itwasnominated提名forthreeAcademyAwards. AnotherbookAnAnthropologistonMarspublishedin1995describedcaseslikethatofapainterwholosthiscolorvisioninacaraccidentbutfoundnewcreativepowerinblack﹣and﹣whiteimages.Sacksalsowrotethestoryofa50﹣year﹣oldmanwhosuddenlyregainedsightafternearlyalifetimeofblindness.Theexperiencewasadisaster.Theman'sbraincouldnotmakesenseofthevisualworld.Afterafullandrichlifeasablindpersonhebecameaverydisabledandmiserable悲惨的sightedmanSackswrote.Whenhewentblindagainhewasrathergladofit. DespitethedramaandunusualstoriesSacks'bookswerenotmeanttobefreakshows.OliverSackshumanizesillness…hewritesofbodyandmindandfromeveryoneofhiscasestudiesthereshowsafeelingofrespectforthepatientandfortheillnessRoaldHoffmannaNobelPrize﹣winningchemistsaidin2001. WhenSacksreceivedtheLewisThomasPrizeforsciencewritingin2002thecitation荣誉状declareduSackspressesustofollowhimintounknownareasofhumanexperienceandforcesustorealizeoncetherethatwearefacingonlyourselves. 1ThefollowingstatementsarewrongEXCEPT. A.TheManWhoMistookHisWifeforaHatwasrankedamongthe25greatestsciencebooks B.AnthropologistonMarsledtoamovieinwhichSackswasactedbyRobinWilliams C.Sacksrecordedamanwhoregainedsightafteralifetimeblindness D.Awakeningsisoftencitedbyneuroscientiststoprovethemysteryofhumanbrain 2WhywasSackscalledoneofthegreatestwritersofscienceoverthepast50years? A.HewasborninLondonandmostfamousforhiswriting. B.Hewroteaseriesofbookstheinfluenceofwhichwasgreat. C.Hewasabrilliantneurologistandhadatrulybeautifulmind. D.HereceivedtheLewisThomasPrizeforsciencewritingin2002. 3Whichofthefollowingistrueaccordingtothepassage? A.OliverSackslosthiscolorvisioninacaraccident. B.OliverSackswontheNobelPrizein2002. C.Awakeningswasfilmedin1973inwhichRobinWilliamsactedasSacks. D.OliverSacksshowedrespectforhumanityinhisbooks. 4Thepassageismainlyabout. A.theawardsOliverSacks'won B.thelifeexperiencesofOliverSacks C.theinfluenceofOliverSacks'works D.thereasonswhyOliverSackssucceeded
随着教育信息化2.0时代的到来依托网络进行线上培训越来越便捷逐步成为实现全民终身学习的重要支撑．最近某高校继续教育学院采用线上和线下相结合的方式开展了一次300名学员参加的“国学经典诵读”专题培训．为了解参训学员对于线上培训线下培训的满意程度学院随机选取了50名学员将他们分成两组每组25人分别对线上线下两种培训进行满意度测评根据学员的评分满分100分绘制了如图茎叶图 1根据茎叶图判断学员对于线上线下哪种培训的满意度更高并说明理由 2求50名学员满意度评分的中位数m并将评分不超过m超过m分别视为“基本满意”“非常满意”两个等级． i利用样本估计总体的思想估算本次培训共有多少学员对线上培训非常满意 ii根据茎叶图填写下面的列联表 并根据列联表判断能否有99.5%的把握认为学员对两种培训方式的满意度有差异 附K2＝
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在△ABC中角ABC的对边分别是abc且． 1求角A的值 2若求△ABC的面积．
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在直角坐标系xOy中直线的参数方程为t为参数0≤α＜π以坐标原点为极点以x轴的非负半轴为极轴建立极坐标系曲线C的极坐标方程为ρ2﹣6ρcosθ﹣8ρsinθ+21＝0已知直线l与曲线C交于不同的两点AB． 1求直线l的普通方程和曲线C的直角坐标方程 2设P12求|PA|2+|PB|2的取值范围．
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已知数列{an}满足n+1an＝nan+1a2＝4等比数列{bn}满足b1＝a1b2＝a2则{bn}的前6项和为
已知直线与抛物线Cx2＝4y相交于AB两点O为坐标原点则三角形OAB的面积为
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已知25℃时KbNH3•H2O＝1.8×10﹣5．该温度下用0.100mol•L﹣1的氨水滴定10.00mL0.100mol•L﹣1的一元酸HA的溶液滴定过程中加入氨水的体积V与溶液中的关系如图所示．下列说法不正确的是
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将函数fx＝sin2x+φ0＜φ＜π的图象向右平移个单位长度后得到函数的图象则函数fx的一个单调减区间为
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Ifyouwearglasseschancesareyouaresmarter.ResearchpublishedinthefamousBritishjournalNatureCommunicationshasfoundthatpeoplewhodisplayedhigherlevelsofintelligencewerealmost30percentmorelikelytowearglasses. Thescientistsstudiedthegenesofthousandsofpeoplebetweentheagesof16and102.Thestudyshowedintelligencecanbeconnectedtophysicalcharacteristics.Onecharacteristicwaseyesight.In3outof10peoplewhoweremoreintelligenttherewasahigherchancetheyneedglasses.Scientistsalsosaidbeingsmarterhasotherbenefits.Itisconnectedtobetterhealth. Itisimportanttoremembertheseareconnectionswhicharenotprovencauses.Scientistscallthiscorrelation.Justbecausesomethingisconnectedtosomethingelsedoesnotmeanoneofthosethingscausedtheother.Andit'sworthnotingthatwhatconstitutes构成intelligenceissubjectiveandcanbedifficultifnotimpossibletomeasure. Forgetgenesthough.Plentyofproofshowswearingglassesmakespeoplethinkyouaremoreintelligentevenifyoudonotneedglasses.Anumberofstudieshavefoundpeoplewhowearglassesareseenassmarterhard﹣workingandhonest.Manylawyersusethisideatohelpwintheircases.LawyerHarveySlovisexplainedthis.Glassessoftentheirappearancehesaid.Sometimestherehasbeenahugeamountofproofshowingthatpeoplehewasdefendingbrokethelaw.Hehadthemwearglassesandtheyweren'tfoundguilty. GlassesarealsousedtoshowsomeoneisintelligentinmoviesandonTVIdeasaboutpeoplewhowearglasseshavebeguntoshift.Peoplewhodonotneedglassessometimeswearthemforfashiononly.Theywanttolookworldlyorcool.Butnoteveryoneisimpressedbythisideathough.GQmagazinesaidpeoplewhowearglassesforfashionaretryingtoohardtolooksmartandhip时髦的.Howeverthathasn'tstoppedmanycelebrities名人fromhappilywearingglasseseveniftheydonotneedthem.JustenBieberisjustonehigh﹣profilefanoffashionglasses. 1Whatdoesthenewstudyshow? A.Peoplewearingglassesaresmarter. B.Peoplewearingglassesarehealthier. C.Wearingglassescanmakepeoplecleverer. D.WearingglassesisassociatedwithhigherIQ. 2WhatdoestheunderlinedwordcorrelationinParagraph3mean? A.Shift. B.Link. C.Proof. D.Consequence. 3Whydosomelawyersasktheirclientstowearglassesincourt? A.Becauseitcancreateamoralimage. B.Becauseitcanmisleadthewitnesses. C.Becauseitcanhighlightclients'qualities. D.Becauseitcanprovetheclients'innocence. 4Whatisthegeneralattitudetothosewhowearglassesforfashion? A.Positive. B.Negative. C.Mixed. D.Indifferent.
已知椭圆的离心率为椭圆上的点到右焦点F的距离的最大值为3． 1求椭圆C的方程 2若椭圆C的右焦点F作倾斜角不为零的直线l与椭圆C交于两点MN设线段MN的垂直平分线在y轴上的截距为t求t的取值范围．
ForalongtimeIthoughtapresentandagiftwerenodifferent.Igrewupinahouseholdwherepresents1specialoccasionssaytherewerealwayspresentsforChristmasandourbirthdays. SowhenImarriedGarywhodidnotgivepresentsona2basisIhadtomakeanadjustment.Garydidnotwhollyavoidgift﹣givingthough.3noticinghowmanyhoursIspendonthe4hebroughthomeashoulderpad垫肩forthetelephonereceiver.Butmostlyhe5holidaysletaloneshopforearringsto6tomeshowinghisaffection. Itriedtochangehim7.IboughtbooksforhisbirthdaysandknittedhimhatsandsweatersforChristmas.8IbegantotellhimwhatIwantedgiving9instructionsbutgotnowhere. Lastyearwhenthesnowstorm10ourtownandhewasonbusinessIusedhispresent﹣roadscraper铲土机to11bothourdriveandourneighbor'sthinkinghow12earringswouldhavebeen.GaryhadwiselychosennotthethingI13butthethingthatheknewIwouldneed. I14begantounderstandthedifferencebetweenapresentandagift.Apresentisjustathing.Butagiftisbroaderandoftencannotbe15.Itisasmallactofkindnessthe16tobendtoanother'sneedsthesacrificeoftimeandeffort.17isagift.Anyexpressionofitfreelygivenisan18fromtheheartthatisimmeasurablybetterthanapresent. MyinsistenceonpresentsmusthaveseemedtoGaryalackof19.forthegiftshehadbeengivingallalongbutheneverstoppedgivingthem. GarywillbehomethisChristmasbutIdon't20apresent.Ialreadyhavethegreatestgift. 1A.marked B.involved C.expressed D.displayed 2A.daily B.rare C.temporary D.regular 3A.Therefore B.Once C.Then D.Besides 4A.gardening B.cooking C.telephone D.Internet 5A.missed B.hated C.abandoned D.ignored 6A.serve B.refer C.present D.relate 7A.bytradition B.byforce C.byexample D.bychance 8A.Yet B.Even C.Thus D.Still 9A.useful B.simple C.specific D.interesting 10A.struck B.disappeared C.melted D.passed 11A.clearup B.tearup C.buildup D.speedup 12A.priceless B.useless C.weightless D.colorless 13A.valued B.prepared C.preserved D.desired 14A.eventually B.definitely C.simply D.totally 15A.obtained B.discovered C.measured D.observed 16A.happiness B.willingness C.wisdom D.freedom 17A.Love B.Passion C.Insistence D.Motivation 18A.sharing B.offering C.following D.experiencing 19A.desire B.concern C.preparation D.appreciation 20A.purchase B.order C.expect D.evaluate
过双曲线的右焦点F作垂直于x轴的直线交双曲线于AB两点若△OABO为坐标原点为等腰直角三角形则该双曲线的离心率为
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曲线y＝x+1ex在点01处的切线方程为．
TopMusicFestivals Festivalseasonisjustkickingoffandthereisalottolookforwardtointheupcomingmonths. FireflyMusicFestival Manypeoplehaven'tthoughtofgoingtoDelawareforasummervacationbutmid﹣Juneisagreattimetoplanthistripifyoulovemusic.Headlinersforthisyear'sshowareTheWeekendMuseTwenty﹣OnePilotsChancetheRapperandBobDylan. Date:June15﹣182017 Location:DoverDelawareUSA MusicType:Rock Price:＄79﹣＄2499 RoskildeFestival ThisDenmarkmusicfestivalhasbeenalocaltraditionsince1971.Therewillbeninestagesforthisyear'seventstohostgroupsliketheFooFightersBlink182andTheLumineers.What'sinterestingaboutthisfestivalisthatinadditiontothebigheadlinersyoucanalsogettoknowup﹣and﹣comingregionalartistsfromDenmarkSwedenandNorway. Date:June24﹣July12017 Location:RoskildeDenmark MusicType:Rockemergingregionalartists Price:DKK995﹣DKK1995around＄144﹣＄289 SecretSolstice WithlongdarkandcoldwintersnobodycelebratessummerquitelikeIcelanders.ToseeforyourselfplanatriptoIcelandthisJunetocheckouttheSecretSolsticefestival.NotonlywillyouenjoyseeingbandslikeRadioheadandAfrikaBambaataabutyoucanalsoexperiencetheother﹣worldlylandscapesandgeothermal地热的springsnearbyaswell. Date:June15﹣182017 Location:ReykjavikIceland MusicType:EclecticIndie Price:€149﹣€1599around＄160﹣＄1725 MontrealJazzFestival AlljazzloversoweittothemselvestocheckouttheMontrealJazzFestivalatleastonceinalifetime.ThiseventbringstogethersomeofthebestnamesinjazzmusicaswellasdiverseR&Bfunk骤停打击乐andsoulartists. Date:June28﹣July82017 Location:MontrealQuebecCanada MusicType:JazzR&BSoulFunk Price:＄27.25﹣＄210.25 1Whatiscommontothemusicfestivalsmentionedinthetext? A.TheyareheldinEurope. B.Theirmusictypesarerockandhip﹣hop. C.Theyaregivenintheopenair. D.Theytakeplaceinsummer. 2WhatcanweinferaboutDelawarefromthetext? A.Itisthecityofmusic. B.Itisnotasummerdestination. C.ItisthehomeofBobDylan. D.Itisacityofhighexpense. 3WhatisthepurposeofIcelanderstoholdtheSecretSolsticefestival? A.Towelcomesummer. B.Tomemorizethepastwinter. C.Tocelebratethecomingofspring. D.Toadvisethelocalbeautifullandscapes.
Earlierthismonthastudyshowedthatbeescanteachthemselvestoplayfootball.Theycanlearnbywatchingandratherthancopywhattheyhaveseenchangeittomakeitbetter.Beesalsohaveaclevertrickforhelpingtheirfriendsfindlunch.Newresearchshowsthatbeesleavesmellylittlefootprintsonflowersthathelpthemknowwhatflowerstheyandtheirfamilymembershaverecentlyvisited. ThediscoverywasmadebyscientistsfromUniversityofBristolwhoreportthesesmellyfootprintshelpbeesdistinguishbetweentheirownscent气味thescentofarelativeandthescentofastranger.Andbyusingthisabilitybeescanimprovetheirsuccessatfindinggoodsourcesofafoodandavoidflowersthathavealreadybeenvisitedandminedofnutrients. TheBristolteamperformedthreeseparateexperimentswithbumblebees大黄蜂inwhichtheywererepeatedlyexposedtorewardingandunrewardingflowersatthesametimethathadfootprintsfromdifferentbeesattachedtothem.Eachflowertypeeithercarriedscent﹣marksfrombumblebeesofdifferingrelatednessorwereunmarked.Themarkswereeitherthebee'sownmarkssistersfromtheirnestorstrangersfromanothernest. Thestudyshowsthatnotonlycanbumblebeestellthemarksoftheirownnestmatesfromstrangersbuttheycanalsodiscriminatebetweenthesmelloftheirownfootprintsandthoseoftheirnestmatesisterswhichcouldhelpthemtorememberwhichflowerstheyhavevisitedrecently.Butitdoesn'texplainhowtheyusethatinthewild.Theymaydetectthefootprintsoftheirfriendsandkeepmovingonsincethatflowermaybetappedout.Ortheymaysmellabitoffamiliarfootsmellanddiveinseeingitasamarkerthatnectar花蜜ispresent. 1WhatcanweinferaboutbeesinParagraph1? A.Theyaresmartlearners. B.Theyhavestrongfamilyties. C.Theyenjoysmellyfootprints. D.Theylikeplayingtricksonothers. 2WhatdoesthisabilityinParagraph2referto? A.Findinggoodsourcesoffood. B.Followingotherbees'footprints. C.Tellingthesmellsoffootprintsapart. D.Recognizingdifferenttypesofflowers. 3Whatcanwelearnfromthefindingsoftheexperiments? A.It'seasierforBumblebeestorecognizetheirfriends. B.It'sunclearhowbumblebeesusetheirabilityinthewild. C.Bumblebees'memorycanbesignificantlyimproved. D.Bumblebees'footprintscangivethemasenseofidentity. 4Whatisthemainideaofthetext? A.Differentflowersattractdifferentbees. B.Beeshaveanewtrickofsurvivinginthewild. C.Bumblebeesmaysmellfootprintstokeeptrackoffood. D.Bumblebeescangiveoffuniquescentstoattractothers.
如图是部分短周期元素原子用字母表示最外层电子数与原子序数的关系下列说法正确的是
已知数列按照k从小到大的顺序排列在一起构成一个新的数列{an}首次出现时为数列{an}的
已知函数fx＝ex1﹣ax﹣x2． 1求fx的单调区间 2若x≥0fx≤1求实数a的取值范围．
如图在四棱锥P﹣ABCD的底面ABCD为矩形点P在底面ABCD的射影O落在AD上． 1求证平面PAB⊥平面PAD 2若OM分别是ADPB的中点且求三棱锥M﹣PDC的体积．
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