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曲线f(x)=e4x﹣x﹣2在点(0,f(0))处的切线方程是( )
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高三下学期数学《》真题及答案
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设函数fx=ax-曲线y=fx在点2f2处的切线方程为7x-4y-12=0.1求fx的解析式2证明曲
已知曲线fx=x3+.1求曲线在点P.24处的切线方程2求曲线过点P.24的切线方程.
设函数fx=ax﹣曲线y=fx在点2f2处的切线方程为7x﹣4y﹣12=0.Ⅰ求fx的解析式Ⅱ曲线y
已知函数fx=exax+b-x2-4x曲线y=fx在点0f0处的切线方程为y=4x+4.1求ab的值
如何求曲线fx在点x0fx0处的切线方程
设函数fx=ax-曲线y=fx在点2f2处的切线方程为7x-4y-12=0.1求fx的解析式2证明曲
已知函数fx=ln1+x﹣x+x2k≥0.Ⅰ当k=2时求曲线y=fx在点1f1处的切线方程Ⅱ求fx的
下列说法正确的是
若f′(x
0
)不存在,则曲线y=f(x)在点(x
0
,f(x
0
))处就没有切线
若曲线y=f(x)在点(x
0
,f(x
0
))处有切线,则f′(x
0
)必存在
若f′(x
0
)不存在,则曲线y=f(x)在点(x
0
,f(x
0
))处的切线斜率不存在
若曲线y=f(x)在点(x
0
,f(x
0
))处没有切线,则f′(x
0
)有可能存在
设函数fx=ax-曲线y=fx在点2f2处的切线方程为7x-4y-12=0.1求y=fx的解析式2证
设函数fx=ax2+bx+kk>0在x=0处取得极值且曲线y=fx在点1f1处的切线垂直于直线x+2
设fx具有二阶连续导数f0=0f’0=0fx>0.在曲线y=fx上任意一点xfxx≠0处作此曲线的切
曲线fx在点x0fx0处的切线与曲线过某点x0y0的切线有何不同
已知函数fx=exax+b-x2-4x曲线y=fx在点0f0处的切线方程为y=4x+4.1求ab的值
设fx具有二阶连续导数f0=0f’0=0f’0>0.在曲线y=fx上任意一点xfxx≠0处作切线此切
设函数fx=ex+gx.若曲线y=gx在点P0g0处的切线方程是y=2x+1则曲线y=fx在点Q0
y=2x+1
y=2x+3
y=x+2
y=3x+2
设函数fx=ax﹣曲线y=fx在点2f2处的切线方程为7x﹣4y﹣12=0求y=fx的解析式和f′x
设函数fx=ax-曲线y=fx在点2f2处的切线方程为7x-4y-12=0.1求函数fx的解析式2求
设函数fx=ax-曲线y=fx在点2f2处的切线方程为7x-4y-12=0.1求fx的解析式2证明曲
下列说法正确的是
若f ′(x
0
)不存在,则曲线y=f(x)在点(x
0
,f(x
0
))处就没有切线
若曲线y=f(x)在点(x
0
,f(x
0
))处有切线,则f ′(x
0
)必存在
若f ′(x
0
)不存在,则曲线y=f(x)在点(x
0
,f(x
0)
)处的切线斜率不存在
若曲线y=f(x)在点(x
0
,f(x
0
))处的切线斜率不存在,则曲线在该点处就没有切线
已知a>0fx=ax2-2x+1+lnx+1l是曲线y=fx在点P.0f0处的切线.求切线l的方程.
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1分It'soverthreeyearssincethereleaseofanimationFrozenbuttheicyqueenandherfrozenempirearestillstayingputinthespotlightasifthemovieonlylastmonth. A.werereleased B.hadbeenreleased C.wouldhavebeenreleased D.wasreleased.
Europeansshouldtrytostayindoorsifashfromlceland'svolcanostartssettlingtheWorldHealthOrganizationwarnedFridayassmallamountsfellinIcelandScotlandandNorway. WHOspokesmanDanielEpsteinsaidthemicroscopic微小的ashispotentiallydangerousforpeoplewhenitstartstoreachtheEarthbecauseinhaled吸入particlescanenterthelungsandcauserespiratoryproblems.AndhealsosaidEuropeanswhogooutsidemightwanttoconsiderwearingamask. Otherexpertshoweverweren'tconvincedthevolcanicashwouldhaveamajoreffectonpeoples'healthandsaidWHO'swarningswerehysterical.Theysaidvolcanicashwasmuchlessdangerousthancigarettesmokeorpollution.Volcanicashismadeoffineparticlesoffragmentedvolcanicrock.Itislightgraytoblackandcanbeasfineastalcumpowder.Duringavolcaniceruptiontheashcanbebreatheddeepintothelungsandcauseirritationeveninhealthypeople.Butonceitfallsfromagreaterdistance﹣likefromthecloudcurrentlyhoveringaboveEurope﹣itshealtheffectsareoftenminimalexpertssay. NotallparticlesarecreatedequalsaidKenDonaldsonaprofessorattheUniversityofEdinburghInthegreatschemeofthingsvolcanicashisnotallthatharmful.AndhesaidmostEuropeans'exposuretovolcanicashwouldbeignoredandthatonlythoseintheneardistrictsoftheIcelandicvolcanowouldlikelybeatrisk. Dr.StephenSpiroaprofessorofrespiratorymedicineanddeputychairoftheBritishLungFoundationsaidthefurthertheparticlestravelthelessdangeroustheywillbe.ThecloudhasalreadypassedovernorthernScotlandandwehaven'theardofanyilleffectstherehesaid.Spirosaidtowearmasksorstayindoorstoavoidvolcanicashwasoverthetopandabithysterical. 1Thetextismainlyabout. A.theeffectofvolcanicash B.thehealthriskofvolcanicash C.thedisadvantagesofvolcanicash D.theopinionsonhealthriskofvolcanicash 2WhichoneistrueaccordingtoParagraph3? A.Thevolcanicash'seffectsonEuropeanswerelittle. B.Theashcausedirritationeveninhealthypeople. C.OtherexpertsthoughtWTO'Swarningswereuseful. D.Thevolcanicashwasmoredangerousthancigarettesmokeorpollution. 3TheunderlinedwordhystericalinParagraph4mostprobablymeans. A.amazing B.practical C.valuable D.overstated 4Whatcanwelearnfromparagraph? A.Thevolcanicashwouldn'tbeharmfultopeople. B.Allexpertsthoughtthevolcanicashdidgreatharmtoourhealth. C.Peopleclosetothevolcanowouldlikelybeatriskaccordingtosomeexperts. D.EuropeansshouldstayindoorsbecauseIceland'svolcanostartssettling.
Weallknowofcoursethatresultsarethecauseofaction.Buthowdoyou1thehabitoftakingaction?Inorder2ustosuccessfullyimplementthehabitoftakingactionwehavetolearnhowtouseourimaginationandindependentwilltoovercomeour3. Wehavea4endowmentashumansweareresponsible.Whenwetakea5lookatthewordresponsibilitywefinditsrootscomefromthetwowordsresponseandability.Wehavetheabilitytorespond6theabilitytotakeaction. Whenwemakethe7ofbecomingresponse﹣ableweacceptthatour8aretheproductofourchoices.Thechoicetotakeactionornotwillultimatelydetermineyourresults.Ifyouwantresultsinlifeyoumust9thehabitoftakingconsistentaction. Thereasonmostpeopledon'ttakeactionisbecausetheythinktheyareaproductoftheir10.Thisisaclassiccaseofdeterminismandadistortedviewofreality.Thisthinkinggetsusnowhereasitleavesourfate11ourcontrol.Ifourcircumstancesarebeyondourcontrolnaturallywe'll12motivationtotakeaction.What'sthepointwhenwe'reaproductofourenvironment? Thismayseemlikeano﹣brainerbutmostpeoplegoforexactlytheopposite.Theygoforsecuritysafetyandcomfort.Theyspendmoretime13outerresourcesthendevelopinginnerones. Ifyou'regoingtodevelopthehabitoftakingactionyouneedtobemotivated.Ifyou'redoingwhatyoulovetodoeverydayyou'relikelytotake14andmassiveaction.Ifyou'reworkinginajobyou15slavingyourselfawayinacubicleyou'relesslikelytotakeaction.You'rejustgoingtodothebareminimumtogetby. Todevelopthehabitofactionweneedtomake16thatinspireus.Whenwe'reinspiredwe'llbemotivatedandthe17resultisthatwe'lltakelotsandlotsofaction. Findawaytostartdoing18youloveevenifyouhavetostartsmall.You'remorelikelytodevelopyourtalentsinsomethingyouloveratherthansomethingthatgivesyoua19senseofsecurity.Ifyoufeellikeyoudon'thaveenoughtime20makingtimefortheimportant.Ifwedon'tmaketimeforthethingsthatreallymattertouswhenwillwe?Whowantstogofromthecubicletothecasket? 1A.take B.have C.make D.develop 2A.of B.to C.for D.at 3A.shortcoming B.conditioning C.doing D.working 4A.unique B.only C.one D.kind 5A.better B.closer C.near D.good 6A.or B.and C.but D.so 7A.chance B.action C.decision D.determination 8A.lives B.fates C.futures D.character 9A.catch B.master C.grasp D.understand 10A.parents B.surroundings C.environment D.God's 11A.under B.without C.beyond D.within 12A.much B.many C.lack D.plenty 13A.getting B.making C.gain D.acquiring 14A.frequent B.continue C.consistent D.often 15A.enjoy B.like C.love D.hate 16A.ideal B.goals C.dreams D.ambitions 17A.natural B.general C.total D.unexpected 18A.that B.where C.how D.what 19A.false B.mistake C.strength D.weakness 20A.guess B.consider C.plan D.advise
Tohelpmakeupforsleeplostduringmarathonnightflightsmigrating迁徙birdstakehundredsofpowernap小睡duringthedayeachlastingafewseconds. EveryautumnSwainson'sthrushes画眉flyupto3000milesfromtheirbreedinggroundsinnorthernCanadaandAlaskatowinterinCentralandSouthAmerica.Comespringthebirdsmakethelongtripback. Thebirdsflymostlyatnightandoftenforlonghoursatatimeleavinglittletimeforsleep.Sotogetthroughthesetiresomeperiodsthrushesduringautumnandspringwhenthebirdsarenormallymigratingchangetheirsleeppatternsstayingawakeatnightandrestingduringday.Butinsteadofsleepingforalongperiodatatimethebirdstookseveralnapsadayeachonelastingonly9secondsonaverage. Thethrushesalsomixeduptheirshut﹣eyesessionswithtwootherformsofsleep.InonecalledunilateraleyeclosureorUECthebirdsrestedoneeyeandonehalfoftheirbrainswhiletheirothereyeandhalfbrainremainedopenandactiveprotectingthemfromdanger. Thebirdsalsooccasionallyslippedintoanotherstateonethatanycollegestudentwhohaseverbeenstuckinaboringlecturecanrelateto.Calleddrownsiness睡意thisstateischaracterizedbyapartialshuttingofbotheyesthatstillallowsforsomevisualprocessing. Intermsofqualitydrowsinessmaybelessusefulthannormalsleepbutitmayalsobesafer.saidFuchs. What'sinterestingisthatevenanimalsshouldmakeupforsleeploss.Thataneedforsleepcannotbelosteveninthesebirdsmeanstheimportanceofsleepformanyifnotallanimalsnottomentionhuman. 1Whatwouldbethebesttitleforthetext? A.MigratingBirdsTravelforLongHours B.MigratingNeedHelp C.HowBirdsMigrateduringAutumn D.MigratingBirdsTakeManyDailyPowerNaps 2Accordingtothetextwhenhavingdrowsinessthethrushes. A.willrestoneeyeandtheotheractive B.willoftensleepduringday C.willstillbecarefulwiththepossibledangers D.willnotseeanythinginfrontofthem 3Whatcanwelearnfromthetext? A.Sleepisimportantforhumanbeing. B.Animalsneedsleeptorest. C.Migratingbirdsneedsleeponlyduringday. D.Collegestudentsoftenhavedrowsinessinfall.
1分Icansharewithherourtravellingexperiencestakingcareofpetsorwehaveincommon. A.whatever B.whichever C.nomatterwhat D.nomatterwhich
1分StudentsarenotrequiredtotaketheTOEELortheIELTStestbutwewelcomethesubmissionofyourscoreifyouhavetaken. A.both B.none C.either D.neither
IfyougoonholidayinItalySpainorGreecedon'tbe1surpriseifeverythingisclosedatnoon.It'snotbecausetheshopsaresufferingahardtimebutit'sbecauseeveryoneisatlunch.IntheseMediterraneancountriesthelocalstakelunchvery2serious.Incontrasttomanyothercountrieslunchhereisnotaquicksnack3consumeinfrontofthecomputeroronthewayto4meeting.Itisthemaineventofthedayandcanlastforseveralhours5covermanycourses. Itsoriginissimple.Becauseofthehotclimateinthesecountriesfarmersthousandsofyearsago6introducearestduringthehottesttimeoftheday.Theywouldhaveabigmealandthentakeanapin7preparefortheremainingwork. Althoughmostemployeesnowworkincooledofficesmanyfamiliesespeciallyonweekendsstillenjoyaluxuriouslunch.8thefocusisnotonlyonthefood.Itisasocialgathering9friendssharefoodandenjoythecompanyofothers. Thisapproachtolifeandeatinghasmanybenefits.AccordingtohealthexpertstheMediterraneandietisoneofthe10healthintheworld.ManypeopleinItalySpainandGreeceenjoyalonghealthyandhappylife.
1分﹣Heytheboywithabluebackpackcomeoverhere?Weneedanotherhandwiththistable. ﹣Me?OhsorrybutI'vegotaninjuryinmyleg. A.shall B.would C.should D.must
1分IwasonceashamedtoadmitmyweaknessbutnowIhavenosuchfeelingandImyselfmuchdiscomfort. A.grant B.dismiss C.save D.rid
10分Ifyouhaveadaughtertakethetimetoreadthis.Itcouldsaveheralotofheartache.Nottomentionstomachachesheadachesmisseddaysofschoollowergradeseatingissuesanddepression. Thesadtruthisthateveryschoolwhetherpublicorprivatehasmeangirls.Ibetyoucanstillevenrememberwhotheyarefromyourschool.AsaschoolconsultantandmotherofthreedaughtersIknowfirsthandbothpersonallyandprofessionallyhowmuchithurtswhengirlsaretargetedbybullies恃强凌弱者. Theoldsayingsticksandstonesmaybreakmybonesbutwordswillneverhurtmecouldn'tbefurtherfromthetruth.Whileboysusuallybullythroughintimidation胁迫girlsbullythroughexclusionalsocalledrelationalaggression.Here'sanexampleofacaseofrelationalbullyingtakenfrommyexperienceasaschoolconsultant HeatherwasmiserablebecauseagirlinherclassLesliewasnotonlysayingmeanthingstoherfacebutgettingtheothergirlsintheclasstoexcludeherwiththeageoldlineYoucan'tbefriendswithmeifyou'refriendswithher.InoursessionsHeatherwouldcomplainthatshedidn'thaveanyonetoplaywithbecausegirlswereafraidthatiftheyhungaroundherthey'dbecomeLeslie'snexttarget. InordertoimprovethesituationIhadtonotonlyreducethepowerLesliehadbutempowerHeatheraswell.Herearesomeideasthathelpedadaptedforusebyparents Askforspecificswhenyourdaughtermentionsbullying.Who?Where?How? Telltheprincipalandclassroomteacherthespecificsofhowsheisbeingbullied.Havethemtellotherteachersi.e.gymartmusichallwaymonitorsandcafeteriastaffsothateveryonewhocomesincontactwithhercanbeonthelookoutandreadytointerfere. Explaintoherthatreportinganincidentisnotthesameastattling打小报告andhavehertellanadultatschoolwhensheisbeingbullied. Teachhertoconveyself﹣confidencebywalkingconfidentlywithherheadup.Bulliestargetthosetheythinkareweaker. Arrangeopportunitiesforyourdaughtertosocializewithherfriendsoutsideofschooltohelphermaintainastrongsocialsupportsystem. InHeather'scasethesestepsrelievedtheproblem.Butbecauseit'stoughertocatchgirlbulliesit'sextremelyimportantforgirlstotellanadultiftheyarebeingbullied.Unlikeboyswhousuallybullyphysicallymeangirlsoftenspreadrumorswhisperastheirtargetwalksbytalkloudlyaboutapartyshewasn'tinvitedtogiveherthesilenttreatmentandasdiscussedabovetellothersnottobefriendswithher.Schoolpersonnelaretheretohelpbutinordertodoanythingtheymustknowaproblemexists!
假如你叫李夏今年即将参加高考学习压力很大想和老师说说心里话请你用英文在你的博客上用书信形式表达出来.主要内容如下 1.感恩老师的关心鼓励 2.望老师能多进行交流适时提供帮助. 3.高考前二十天的学习的打算.至少写两点. 注意1.短文必须包括所有内容要点可适当发挥. 2.词数100左右开头与结尾已给出不计入词数 Dearmyteachers Yours LiXia
You'regoingtotheUnitedStatestolive?Howwonderful!You'rereallylucky! Doesthissoundfamiliar?Perhapsyourfamilyandfriendssaidsimilarthingstoyouwhenyoulefthome.Butdoesitseemtrueallthetime?Isyourlifeinthisnewcountryalwayswonderfulandexciting?Agreatmanyfactsshowthatit'snoteasyfornewcomerstoadjusttolifeinanewculture.Theyhavetoexperiencecultureshock. Whatcausescultureshock?Maybetheweatherisunpleasant.Perhapsthecustomsaredifferent.Perhapsthepublicservicesystemssuchasthetelephonepostofficeortransportationaredifficulttofigureoutandyoumakemistakes.Thesimplestthingsseemdifficult.Thelanguagemaybedifficult.Thefoodmayseemstrangetoyou.Ifyoudon'tlooksimilartothenativesyoumayfeelstrange.Youmayfeelasifeveryoneiswatchingyou.Infactyouarealwayswatchingyourself. Everyoneexperiencescultureshockinsomeformoranother.Butcultureshockcomesasasurprisetomostpeople.Alotofthetimethepeoplewiththeworstcultureshockarethepeoplewhoneverhadanydifficultiesintheirowncountries. Theywereactiveandsuccessfulintheircommunity.Theyhadhobbiesorpastimeswhichtheyenjoyed.Whentheycometoanewcountrytheydonothavethesamepositionsorhobbiesastheyalreadyhadintheircountries.Theyfindthemselveswithoutarolealmostwithoutanidentity.Theyhavetobuildanewself﹣image. Cultureshockproducesafeelingofdisorientation迷惘whichmaybehomesicknessimaginedillnessorevenparanoia妄想.Whenpeoplefeelthedisorientationofcultureshocktheysometimesfeellikestayinginsideallthetime.Theywanttoprotectthemselvesfromtheunfamiliarenvironment.Theywanttocreateanescapewithintheirroomtogivethemselvesasenseofsecurity.Thisescapedoessolvetheproblemofcultureshockfortheshorttermbutitdoesnothingtofamiliarizethepersonmorewiththeculture.Familiarityandexperiencearethelong﹣termwaystosettletheproblemofcultureshock. 1Whoisthepassagemainlyfor? A.ThefamilyandfriendsofthosewhocametotheUS. B.Thosewhohavegotridofcultureshock. C.Peoplewhohavejustmovedtoaforeigncountry. D.PeoplewhocaneasilyadjusttheirlifeintheUS. 2TheunderlinedpartyouarealwayswatchingyourselfinParagraph3means. A.youarealwaysfeelinghomesick B.youarealwaysworriedtoomuchaboutyourself C.youarealwayslookingatyourselfinthemirror D.youarealwaysnervousaboutmeetingotherpeople 3Whichofthefollowingwouldbeacaseofcultureshockfornewcomers? A.Theyhavetroubleusingpublictelephones. B.Theirpositionsorhobbiesstaythesame. C.Theyareactiveandsuccessfulinthenewcommunity. D.Theyhavegotusedtothelifeinthenewcountry. 4Whichofthefollowingmaycausenewcomerstolackasenseofsecurity? A.Anewidentity. B.Localfood. C.Anewself﹣image. D.Strangeenvironment. 5Thebestwayforthenewcomerstoovercomecultureshockis. A.tostayinsidetoprotectthemselves B.tomakeastudyofnewhobbies C.toadaptthemselvestothenewenvironment D.toaskpeopleforhelpwhenhavingdifficulties
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