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两位男同学和两位女同学随机排成一列，则两位女同学相邻的概率是（ ）
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高三下学期数学《》真题及答案
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红花中学现要从甲乙两位男生和丙丁两位女生中选派两位同学分别作为①号选手和②号选手代表学校参加全县汉字
男女同学的体重一样在开展游戏时首先这两位同学从一楼跑步上三楼结果是男同学先到达女同学后到达三楼．下
男同学做功多
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男女同学做功一样
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五一黄金周期间几位同学一起去郊外游玩．男同学都背着红色的旅行包女同学都背着黄色的旅行包．其中一位男
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甲乙丙丁四位同学进行一次乒乓球单打比赛要从中选出两位同学打第一场比赛.1确定甲打第一场再从其余三位同
甲乙丙丁四位同学进行一次乒乓球单打比赛要从中选出两位同学打第一场比赛.1请用树状图法或列表法求恰好选
甲和乙两位体重相等的同学进行登楼比赛甲用2分钟登上10楼乙用1.5分钟登上8楼则
甲和乙两位同学做功之比为10：8。
甲和乙两位同学做功之比为9：7。
甲和乙两位同学的功率之比为7：12。
甲和乙两位同学的功率之比为28：27。
从6名男同学和4名女同学中随机选出3名同学参加一项竞技测试每位同学通过测试的概率为0.7试求1选出的
十一黄金周期间几位同学一起去郊外游玩男同学都背着红色的旅行包女同学都背着黄色的旅行包其中一位男同学说
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某校初三1班团支部组织班级全体团员参加校团委组织的中国梦写短信比赛活动．团支部对该班全体团员所发短
三位男同学和三位女同学站成一排要求任何两位男同学都不相邻则不同的排法总数为
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某中学现要从两位男生和两位女生中选派两位同学分别作为1号选手和2号选手代表学校参加汉字听写大赛.1请
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阅读下面短文根据所给情节进行续写使之构成一个完整的故事.WhenIarrivedat6a.m.inthelargehospitalkitchenRosewasalreadycheckingnametagsonthetrays托盘.HiI'mJanet.'ItriedtosoundcheerfulalthoughIalreadyknewRose'sreputationforbeingimpossibletoworkwith.'I'mscheduledtoworkwithyouthisweek.'Rosestoppedwhatshewasdoingandpeeredoverherreadingglasses.Icouldtellfromherexpressionshewasn'tpleasedtosecastudentworker.'Whatdoyouwantmetodo?Startthecoffee?'Iasked.Rosecoldlynoddedandwentbacktocheckingnametags.Ifilledthe40﹣cuppotwithwaterandbeganmakingthecoffeewhenRoseyelled'That'snotthewaytomakecoffee.'Shesteppedinandtookover.NothingIdidpleasedher.Allmorninghereagleeyesmissednothingandhersharpwordshurt.TotallyexhaustedItrudgedthesixblockshomelatethatJuneafternoon.AsathirdyearuniversitystudentworkingmywaythroughschoolIhadneverbeforemetanyonelikeRose.FightingbacktearsIwrestledwithmydilemmaaloneinmyroom.'WhatshallIdo?'Theanswercaughtmecompletelybysurprise.IneededtoloveRose.WorkingwithRosethenextmorningIignoredthehurtfulremarksthrowninmydirectionanddidthingsRose'swayasmuchaspossible.AsIworkedIsilentlybegantosurroundRosewithawarmblanketoflove.Overthenextfewdaysanamazingthingbegantohappen.MyfocusshiftedfromwhatshewasdoingtomeandIstartedseeingRoseasthehurtingpersonshewas.Thenhericytensionbegantomeltaway.Throughouttherestofthesummerwehadnumerousopportunitiestoworktogether.Eachtimesheseemedtrulyhappytoseeme.Herbitternessgavewayasshestartedopeningup.AsIworkedwiththislonelywomanIlistenedtohersomethingnooneelsehaddone.Ilearnedthatshewasburdenedbyelderlyparentswhoneededhercareandherownhealthproblems.ThedaysslippedbyquicklyasIfinishedthelastseveralweeksofmysummerjob.Isoonwouldbereturningasafull﹣timeuniversitystudentandsaygoodbyetoRose.注意1.所续写短文的词数应为150左右2.应使用5个以上短文中标有下划线的关键词语3.续写部分分为两段每段的开头语已为你写好4.续写完成后请用下划线标出你所使用的关键词语.Paragraph1OnedaywhileIwasworkingaloneinoneofthehospitalkitchensRoseenteredtheroom.Paragraph2AlthoughIneversawRoseagainIstillrememberhervividly.
Neitherstyleofthinkingisbetterorworsethantheotherthey'rejustdifferentasProfessorAnkushChopraexplains.Tobeagreatartistmusicianorbig﹣picturethinkerholisticthinkingisimportant﹣it'saboutcontextandintuition直觉isimportant.Manycareerslikethoseinscienceorlawrewardanalyticthinkingwhichlooksatpartsandunitsandisspecificandlogical.Ofcoursethemostsuccessfulpeoplewillbeabletodobothkindsofthinkingthoughgenerallyholisticthinkinglinkedtocreativityismoredifficulttoteachthananalyticthinking. Sothosepeoplewhoareanalyticthinkerswillseeapriceof＄1.99bylookingatthesinglenumbersandwillprioritizethefirstnumberwhenitcomestoprice.Holisticthinkerstendtoviewallpricenumbersasawholeandarelesslikelytobeaffectedbythenine﹣endingpriceeffectLingjiangLoraTuPh.D.professorofmarketingatBaylorandastudy'sleadauthortoldPhys.org. Howeverthatthetypeofthinkingallowsholisticthinkerstoseethewholeratherthanthepartsgoesoutthewindowwhenthey'restressedordistracted分心的. Ourfindingssuggestthatregardlessofconsumers'thinkingstylenine﹣endingpricesaremostlikelytobeeffectiveinsituationsthatoveruseconsumers'resourcessuchaswhenshoppersaretime﹣pressuredatthecheckoutcounterordistractedbybackgroundmusicoroccupiedwithaninteractiveproductdemonstrationTusaid. Thisstudywasdonewiththeideathatmarketersshouldknowaboutthesedifferencesinthinkingstyleandkeeptheminmindwhenthey'repricingthingsfordifferenttypesofpeople.Butanyonewhobuysthingscanbenefittoobyfiguringoutwhatkindofthinkeryouareandthenkeepingthatinmindwhenthesignsshowsalewithaloudnoise!﹣andremindingyourselfthatnobodymakesthebestdecisionswhenthey'redistracted. 1Whichofthefollowingcanbethebestexampleofholisticthinking? A.OnlyifthewholethingmakessensecanJackconcentrateondetails. B.InAmericanshopsyoucanfindmanythingswithnine﹣endingprices. C.Jackkeptonworkingononethingandfinallyachievedgreatsuccess. D.Understandingeachparagraphleadstounderstandingthewholepassage. 2TheunderlinedwordprioritizeinPara.2mostprobablymeans. A.takenonoticeof… B.treat…equally C.thinkof…thetrickiest D.consider…themostimportant 3Accordingtothepassageaconsumershouldrememberthat. A.thenine﹣endingpricescanequallyaffectanytypeofconsumer B.pricingthingsfordifferenttypesofpeoplebenefitscustomers C.backgroundmusicisn'talwaystocreateapleasantatmosphere D.it'simpossibletoaffecthimevenifhe'sdistractedorstressed 4Fromthepassageweknowthat. A.differentthinkingstylescreatedifferentpricingsystems B.preferenceofpricingsystemcanindicatethinkingstyle C.holisticthinkingsomewhatoutweighsanalyticthinking D.bothstylesofthinkingcannotbebeneficialtoonecareer
某行业主管部门为了解本行业中小企业的生产情况随机调查了100个企业得到这些企业第一季度相对于前一年第一季度产值增长率y的频数分布表． 1分别估计这类企业中产值增长率不低于40%的企业比例产值负增长的企业比例 2求这类企业产值增长率的平均数与标准差的估计值同一组中的数据用该组区间的中点值为代表．精确到0.01 附≈8.602．
已知复数z满足2-iZ=|3+4i|则Z=
设a=20.5b=0.52c=log20.5则abc的大小关系为
阅读下面短文根据其内容写一篇60词左右的内容概要.Parentseverywherepraisetheirkids.JennBermanauthorofTheAtoZGuidetoRaisingHappyandConfidentKidssays'We'vegonetotheoppositeextremeofafewdecadesagowhenparentstendedtobemorestrict.'Bygivingkidsalotofpraiseparentsthinkthey'rebuildingtheirchildren'sconfidencewheninfactitmaybejusttheopposite.Toomuchpraisecanbackfireandwhengiveninawaythat'sinsinceremakekidsafraidtotrynewthingsortakeariskforfearofnotbeingabletostayontopwheretheirparents'praisehasputthem.Stilldon'tgotoofarintheotherdirection.Notgivingenoughpraisecanbejustasdamagingasgivingtoomuch.Kidswillfeellikethey'renotgoodenoughorthatyoudon'tcareandasaresultmayseenopointintryinghardfortheiraccomplishments.Sowhatistherightamountofpraise?Expertssaythatthequalityofpraiseismoreimportantthanthequantity.Ifpraiseissincereandfocusedontheeffortnottheoutcomeyoucangiveitasoftenasyourchilddoessomethingthatdeservesaverbalreward.'Weshouldespeciallyrecognizeourchildren'seffortstopushthemselvesandworkhardtoachieveagoal'saysDonahueauthorofParentingWithoutFearLettingGoofWorryandFocusingonWhatReallyMatters.'Onethingtorememberisthatit'stheprocessnottheendproductthatmatters.'Yoursonmaynotbethebestbasketballplayeronhisteam.Butifhe'soutthereeverydayandplayinghardyoushouldpraisehiseffortregardlessofwhetherhisteamwinsorloses.Praisingtheeffortandnottheoutcomecanalsomeanrecognizingyourchildwhenshehasworkedhardtocleantheyardcookdinnerorfinishabookreport.Butwhateveritispraiseshouldbegivenonacase﹣by﹣casebasisandbeproportionate相称的totheamountofeffortyourchildhasputintoit.
若变量xy满足约束条件则z=3x﹣y的最大值是．
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We'veallhadcaseswherewe'vewaitedjustabittoolongtopayanelectricbillorspeedingticket.ButonemanfromCaliforniabyreasonableassumptionwhogoesbyDaverecentlytookprocrastination拖延onestepfurtherbypayingaparkingticketalmostahalf﹣centuryafteritwasgiven. InDecember2018theMinersvillePoliceDepartmentinPennsylvaniareceivedaletterinthemail.WhoeverwrotetheletterdecideditwasbesttokeephisnamesomewhatunknownsoheputthereturnaddressasWaywardRoadAnytownCaliforniaunderthenameFeelingguilty. Whentheofficersopenedtheenvelopetheyfoundabriefletteralongwitha＄5billandaparkingticketdatingallthewaybackto1974.ThenotereadDearPDI'vebeencarryingthisticketaroundfor40plusyearsalwaysintendingtopay.ForgivemeifIdon'tgiveyoumyinfo.WithrespectDave. Eventhoughtheinitialparkingticketwasonlyfor＄2Davemusthavefeltawfullyguiltybecauseheleft150percentor＄3ininterest. MichaelCombsthePoliceChiefoftheMinersvillePoliceDepartmentstatedinaninterviewthatthesameticketwouldcostabout＄20ifitwasgiventoday.Combswentontosharethattheoriginalticketfrom1974wasgiventoavehiclethathadanOhiolicenseplate. Becausetherewasnosystemfortrackingticketsgiventoout﹣of﹣statecarsbackthenDavecouldhavegottenawaywithneverpayingthe＄2fine.Butapparentlyguiltgotthebestofhimandhedecidedtofinallycoughupthemoneymorethan40yearspastitsduedate. 1HowmuchdoweknowaboutDave? A.HelivesinWaywardRoadAnytownCalifornia. B.Thepolicearetryingtofindoutmoreabouthim. C.HiscarprobablycamefromOhioatthattime. D.Daveisofcoursetheman'srealnameindeed. 2Whydidn'tDavepayfortheparkingticketuntilrecently? A.Hecompletelyforgotaboutitinthepast44years. B.Hedidn'tfindituntilalmosthalfacenturylater. C.Hefailedtofindoutwhoheshouldpaythemoneyto. D.Hedidn'tpayforitjustbecauseofprocrastination. 3WhatdroveDavetopayfortheparkingticketatlast? A.Astrongsenseofguilty. B.Fearofbeingtrackedbythepolice. C.Worryaboutbeingfinedmore. D.Suddenchangeofhisfinancialsituation. 4Whichofthefollowingcanbethebesttitle? A.PoliceChiefoftheMinersvillePoliceDepartmentSharesaStory B.MysteriousProcrastinatorFinallyPays44﹣Year﹣OldParkingTicket C.UnusualLetterComesfromWaywardRoadAnytownCalifornia D.ParkingTicketCarriedAroundforAlmostHalfaCenturyfromOhio
若抛物线y2=2pxp＞0的焦点是椭圆+=1的一个焦点则p=
ChinaisknownastheKingdomofBamboo.Morethan400speciesofbambooonethirdofallknownspeciesintheworldgrowinChina.China1leadtheworldintheamountofareaplantedwithbamboothenumberofbambootreesandtheamountofbamboowood2produceeveryyear. Theoldestbamboo3articleinChinawereunearthedfromtheremainsofaprimitivesocietythatexistedsome7000yearsagoin4isnowHemuduYuyaoCountyZhejiangProvince.AsearlyastheShangDynastyChinesepeopleusedthebambooformakingweaponssuchasbowsandarrows.Beforepaper5inventstripsofbamboowerethemostimportantwritingmediummorewidelyusedthansilk6theywerecheaperresistanttocorrosion腐蚀andmoreabundant.BamboohasthusplayedanimportantpartinthespreadanddevelopmentoftraditionalChineseculture. Bamboowas7closeconnectedwiththedailylivesofpeopleinancientChina.SuDongpoaliterarygiantoftheSongDynastysaidthatpeoplecouldnotlive8bamboo andpeopleofthetimeusedbamboo9makepaperhatsshoesandsoon.Atthattimeastodaybambooshootswereeatenasapopulardishbecauseof10theycrispnessandfreshsweettaste.Bambooshootsalsocontainvitaminssugarfatandprotein.
Hereallydidlooklikeatouristwithacameraaroundhisneckandabottleofsunscreenstickingoutofhisbag. Thefatmansatontheterrace草坪drinkinglemonadealittlebiteachtimeand1tolookatasmoothandshinycruisebrochure.Hissunglasses2hiseyesbutIknewhewasn'tlookingatthebrochurehehadn'tturneda3forthelasttenminutes. AsIbroughthimwhathehadorderedhecoughedupathankyouandlookedatme4.Itriednottostareatthetinyscaracrosshislefteyebrow. Iwalkedbackinsidewithmy5tray托盘shakingmyhead.Helooked6butIcouldn'tquiteplacehim. Thenit7me.Thecaraccident.The8strangerwhohelpedmeoutofmysmashedcar9beforeitexploded.I10backtohistable. Hewasgone. Imovedhissaucerandfoundhistipalongwitha11 Iamdeeply12toyou.ThenightofyourcaraccidentIwasonmywayto13ajewelrystore.Savingyour14broughtthingsbackinperspective看法.Inowliveanhonestlifethankstoyou.Godblessyou!Mr.D. Itrembled.ThenightofmycaraccidentIwas15foraninterviewinashadydanceclub.Seeinghumankindnessthroughhis16gestureturnedmylifearoundandbrought17backintomylife. I18thetipheleft.Amongtheone﹣dollarnoteswasa100﹣dollarnotewithapenmark19InGodWeTrustwhichfirstappearedonpapermoneyin1957. Isaidasilent20forhimandgotbacktoworksmiling. 1A.asking B.pretending C.refusing D.burning 2A.masked B.protected C.beautified D.comforted 3A.picture B.bottle C.page D.dish 4A.shyly B.worriedly C.fixedly D.briefly 5A.empty B.clean C.heavy D.new 6A.kind B.familiar C.sad D.puzzled 7A.attracted B.failed C.moved D.hit 8A.funny B.wealthy C.mysterious D.hungry 9A.even B.perhaps C.just D.long 10A.rushed B.inched C.struggled D.danced 11A.book B.card C.notice D.Poster 12A.committed B.attached C.guilty D.grateful 13A.rob B.visit C.help D.manage 14A.money B.face C.life D.Time 15A.waiting B.longing C.heading D.Preparing 16A.friendly B.heroic C.traditional D.Exciting 17A.happiness B.glory C.honesty D.faith 18A.dropped B.doubted C.weighed D.unfolded 19A.colouring B.underlining C.enlarging D.deleting 20A.prayer B.hello C.congratulation D.apology
LearntoManageYourTimeinCollege Acommonviewbothamongandofcollegestudentsisthattheyarealwaysshortonmoney.Whilethismaybetruemanycollegestudentsarealsoalwaysrunningshortonsomethingelsetime.1Hereareafewthingstoconsider Manageyouracademictime.2Consequentlyyouracademicworkshouldalwayscomefirstwhenitcomestoarrangingyourtimeinorderofimportance.Whenlookingatyourschedulefortheweekfigureoutwhatyouracademiccommitmentslooklike.Whattimedoyouhaveclasses?Howmuchhomeworkdoyouhavetodo?Whatassignmentsaredue?Whendoyouhavemajorexamsorquizzes? Manageyourpersonaltime.Itsanunrealisticexpectationtothinkthatyoucanstudygotoclassandworkalldayeveryday.3Makesuretoallowyourselftimetogotosomethingfunintheyardattendameetingforyourfavoriteclubandjusthangoutforanhourorsoatnightwithfriendsoverdinner.Doingthingsthatmakeyourpersonaltimemoreenjoyableandnottotallyfocusedonschool?canactuallyimproveyourproductivitywhenworkingonprojectslater. Keepyourhealthinmind.Whenpeople'sschedulesaretightoneofthefirstthingstogoissleep.Whileitmaybecommonamongcollegestudentsalackofsleepismorehurtfulthanyoumightthink.Itcanthroweverythingintodisorderyourmentalhealthyourphysicalhealthyourstresslevelandofcourseyourschedule.4 Useyourtechnology.Nothinghelpsacollegestudentstayorganizedmorethanagoodcalendar!SomestudentsusethecalendarsontheirphonesothersusethingslikeGoogleCalendarothersstillusetheclassicpaper﹣calendarmodel.5Justchangeandtryagain. A.Tryyourbesttokeeparoutineonaregularbasis. B.Rememberthatyourbrainneedstohaveabreaktoo. C.Ifwhatyou'reusingisn'tworkingforyoudon'tgiveup. D.Howcanyoubalanceyourtimewhenthereneverseemstobeenoughofit? E.It'simportanttorememberwhyyou'reincollegeinthefirstplacetograduate. F.Makingalistandthencrossingitemsoffastheyarecompletedcanbesatisfying. G.Takemomentstoplanoutthetimeforaweekyourhomeworksocialtimeandsleep.
已知双曲线-=1a＞0b＞0的左右焦点为F1F2过左焦点F1作垂直于x轴的直线交双曲线的两条渐近线于MN两点若∠MF2N是直角则双曲线的离心率是
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.错误仅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\划掉.修改在错的词下画一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Iusedtothinkcooperatingwasteoftimebutonethingchangesmymind.Onedaythescientificteacheraskedustodosomeresearchesandhandedintheconclusion.ThattookmelotsoftimetodotheresearchbutIstillcouldn'tfinishedit.SoItriedtocooperatewithothers.Wesharedourresearchesandthenmadethecompletelyconclusionsoon. SoIthinkcooperatingnotonlysavesourtimesbutalsohelpsustopromotethecommunicationwithothers.Althoughintheworldtodayveryfewthingscanbesuccessfullydonebyjustonepersoncooperatingcanbenefitfrombothorallsides.
TheAmericanHeartAssociationAHAsaysthattoomanypeoplearespendingfartoomuchtimeonchairsandcouches.BasedonexistingevidencewefoundthatU.S.adultsaresedentaryforaboutsixtoeighthoursadaysaidDeborahRohmYoungchairofAHApanelthatwrotethenewadvisory. AccordingtotheAHAgrowingevidenceshowsthatonitsownexerciseisn'tenoughtocancelouttheunhealthyeffectsofsittingforalongtime.RegardlessofhowmuchphysicalactivitysomeonegetslongsedentarytimecouldnegativelyinfluencethehealthofyourheartandbloodvesselsYoungexplained. Theexactmechanismsbehindtheeffectaren'tyetclear.Therearemanyimportantfactorswedon'tunderstandaboutsedentarytimeyetYoungsaid.Shestressedthatthetypesofstudiesavailableidentifytrendsbutdon'tprovecauseandeffect. Wedon'thaveinformationabouthowmuchsedentarybehaviorisbadforhealth﹣thebestadviceatthistimeisto‘sitlessandmovemoresheadded. Howmuchmore?AccordingtotheAHApeopleshouldtrytogetatleast30minutesofmoderatetovigorous剧烈的exerciseadaytoreachtherecommended150minutesofmoderateexerciseor75minutesofvigorousexerciseaweekThat'shealthierthantryingtocramtheirweeklyexerciseintooneortwodaysaccordingtothestatement. TherealrisksimplycomesdowntotheamountwesitwithouttherebeingatruemedicineormethodtocontroltheharmfuleffectssaidSteinbaumapreventivespecialistinheartdisease. Stillsocietyhasevolvedtoencouragesittingsheadded. Ourliveshavebecomefocusedaroundactivitiesrequiringustobestill﹣whetheritbetransportationourcomputersorthetelevisionorcomputerinourleisuretimeSteinbaumsaid.Sociologicallyinsteadofbeingactivetobeproductiveortohaveenjoymentourproductivityandfunoftenrequiresminimalphysicalactivities. 1WhatisthemainpurposeofthenewadvisorydeliveredbyAHA? A.Toadvisepeopletositlessandexercisemore. B.Toexplorethecauseandeffectofinactivebehavior. C.Toanalyzethelinkbetweenhearthealthandexercise. D.Toshowthegeneralsocialtrendofencouragingsilting. 2WhichofthefollowingwouldDeborahRohmYoungmostprobablyagreewith? A.Doingexerciseisofnobenefittothosecouchpotatoes. B.Sittingtoomuchisacontributingfactortoheartdiseases. C.Theexactcausebehindtheeffectoflong﹣timesittingisapparent. D.Thevitalthingforhealthisthetotalamountofweeklyexerciseyoudo. 3AccordingtoSteinbaumtheincreaseofsittingtimeis. A.abasicaspectofpromotingthequalityoflife B.arealriskthatcanberemovedbyvigorousexercise C.anunavoidableconsequenceofsocialdevelopment D.abigchangeinmodempeople'sconceptofhealth
Thereareseveralreasonswhyschooluniformsaregoodidea.Firstofalluniformshelptheschoollooksmart.Thestudentsfeelthattheybelongtoaparticulargroup.Wheneverypupilintheschoolwearstheuniformnobody1havetoworryaboutfashion时尚.Everybodywears2samestyleofclothes.Uniformscanbeusefulinunexpectedways.AschoolinIrelandhasintroducedaninterestingnewuniform.Ontheedgeofthejacketthereisapieceofcloth3givesofflightinthedark.Whenthechildrenarewalkingor4cycletoschoolondarkmorningscardriverscan5easyseethem. Butcanuniformshelpimproveschoolstandards?Theanswer6thisquestionisnotclear.OnestudyinAmericafoundthatstudents'grades7improvealittleaftertheschoolintroduceduniforms.Butsomestudentsdidn'twant8weartheuniform.OtherAmericanstudiesshowedno9connectbetweenuniformsandschoolperformance. Schooluniformsare10traditioninBritainbutsomeschoolsarestartingtogetridofthem.Someverygoodschoolsdon'thaveauniformpolicy.Howeveruniformsarestillpopular.Pupilsatabout90percentofBritishsecondaryschoolswearuniforms.
已知关于x的方程ex-2x-k=0有2个不相等的实数根则k的取值范围是
已知α∈02sin2α=cos2α+1则sinα=
已知向量=23=32则|﹣|=
如图点D是△ABC的边BC上一点AB=AD=2BD=1∠ACB=45°那么∠ADB=AC=
在“一带一路”知识测验后甲乙丙三人对成绩进行预测． 甲我的成绩比乙高． 乙丙的成绩比我和甲的都高． 丙我的成绩比乙高． 成绩公布后三人成绩互不相同且只有一个人预测正确那么三人按成绩由高到低的次序为
已知函数在区间-∞a]上单调递减在a+∞上单调递增则实数a的取值范围是．
△ABC的内角ABC的对边分别为abc．已知bsinA+acosB=0则B=．
已知函数fx=x﹣1lnx﹣x﹣1．证明 1fx存在唯一的极值点 2fx=0有且仅有两个实根且两个实根互为倒数．
设αβ为两个平面则α∥β的充要条件是
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