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复数z=(1+i)2i(i为虚数单位)等于( )
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高二下学期数学《》真题及答案
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已知复数z满足1+iz=|2i|i为虚数单位则z等于
1﹣i
1+i
﹣
i
已知z﹣2=z+2ii为虚数单位则复数z=
1+2i
1﹣2i
2i
﹣2i
已知i是虚数单位若复数z满足zi=1+i则z²=
)-2i (
)2i (
)-2 (
)2
2018年·哈师大一模已知复数z满足1+iz=|2i|i为虚数单位则z等于
1﹣i
1+i
﹣
i
已知复数z满足i﹣1z﹣i3=2ii为虚数单位则z的共轭复数为
i﹣1
1+2i
1﹣i
1﹣2i
2018年·哈六中二模已知复数z满足i﹣1z﹣i3=2ii为虚数单位则z的共轭复数为
i﹣1
1+2i
1﹣i
1﹣2i
若复数z满足2z+=3﹣2i其中i为虚数单位则z=
1+2i
1﹣2i
﹣1+2i
﹣1﹣2i
若复数zl=-1+2iz2=-1-i其中i是虚数单位则zl+z2i的虚部为
-2i
-2
2i
2
已知i为虚数单位1﹣2i•z=i3.则复数z在复平面内对应的点在
第一象限
第二象限
第三象限
第四象限
已知复数z满足1+iz=|2i|i为虚数单位则z等于
1﹣i
1+i
﹣
i
若复数z满足2z+=3﹣2i其中i为虚数单位则z=
1+2i
1﹣2i
﹣1+2i
﹣1﹣2i
若复数z满足2z+=3﹣2i其中i为虚数单位则z=
1+2i
1﹣2i
﹣1+2i
﹣1﹣2i
设复数z满足=|1﹣i|+ii为虚数单位则复数z为
﹣i
+i
1
﹣1﹣2i
5.00分若复数z满足1+iz=2ii为虚数单位则z=
1+i
1﹣i
﹣1+i
﹣1﹣i
若复数z=i1﹣2ii为虚数单位则=
1﹣2i
1+2i
2+i
2﹣i
5.00分已知复数z满足z1+i=2ii为虚数单位则复数z的共轭复数为
1+i
1﹣i
﹣1+i
﹣1﹣i
已知复数1﹣i=i为虚数单位则z等于
﹣1+3i
﹣1+2i
1﹣3i
1﹣2i
若复数z满足z1-i=2ii是虚数单位是z的共轭复数则z·=.
已知复数z=﹣i1+2i﹣2ix∈R为虚数单位则复数z的虚部为
2
﹣3
﹣3i
2i
若复数z满足2z+=3﹣2i其中i为虚数单位则z=
1+2i
1﹣2i
﹣1+2i
﹣1﹣2i
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若直线y=cc∈R与函数y=tanωxω≠0的图象相邻的两个交点之间的距离为1则函数y=tanωx图象的对称中心为
在△ABC中已知角ABC的对边分别为abc且a=xb=3B=60°若△ABC有两解则x的取值范围是.
已知数列{an}的前n项和为Sn若3Sn=2an﹣3n则a2019=
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一下作文.文中共有10处语言错误每句中最多有两处.没出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. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.没出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. Aswintercomestherearemuchrainandsnowinmanypartsofourcountryincludingourcity.Itistoocoldthatanincreasingnumberofstudentscatchacold.Evenworsesomestudentsfelldownandhurtthembecausetheicyroads.Soweshouldprotectourselvesfromcoldweatherandtherearemanythingswhatareofhelp.Firstweshouldputupmoreclotheswhengoingoutside.Thentoremembernottorunorwalktoofastonslipperyroads.Luckilysomemeasureshavebeentakingtopreventusfromfallingdown.Forexamplesomematshavebeenplacedonthestepoftheteachingbuilding.Ihopeeveryoneissafeandhealth.
中国古代数学著作算法统宗中有这样一个用诗歌描述的数学问题 三百七十八里关初行健步并不难 次日脚痛减一半六朝才得至其关 欲问每朝行里数请公仔细算相还 其意为有一个人走378里路第一天健步行走从第二天起因脚痛每天走的路程为前一天的一半走了6天后到达目的地问此人每天走多少里路 据此回答此人第五天走的路程为
如图有一辆汽车在一条水平的公路上向正西行驶汽车在A点测得公路北侧山顶D的仰角为30°汽车行驶300m后到达B点测得山顶D在北偏西30°方向上且仰角为45°则山的高度CD为
设集合A={x|﹣3≤2x﹣1≤3}集合B为函数y=lgx﹣1的定义域则A∪B=
10分 Riseandshineallday Makingtheseeasytaskspartofyourmorningschedulewillimproveyournutritionenergyandmoodtoday﹣andbeyond. Stretchinbed Trythisevenbeforeyouopenyoureyes.Liftonearmandbeginbystretchingeachfingerthenyourhandthenyourwristandthenyourwholearm.1.Thenstretchyourtoesfeetanklesandlegs.Finallyendwithaneckandbackstretchthatpushesyououtofbed.Thispowerposemakesyoufeelmoreconfidentalldaylong. 2Workingoutbeforeyoueatencouragesyourbodytoburnmorefatforenergyratherthanrelyingoncarbohydrates碳水化合物fromfood.Inastudyparticipantswhoexercisedafterbreakfaststillgainedweightbutthosewhoexercisedonanemptystomachdidnot. Turnonthemusic 3.Ifanyoneplaysaninstrumentandifyouhavealittletimemorningistheperfecttimetopracticeasitpreparesyourbrainforlearning.Onestudyfoundthatbothplayingandlisteningtomusichelpimproveacademicperformancein16differentwaysincludingincreasingfocusandmemory. Enjoysomefun Manypeoplefeartofaceanewdayofworkschoolorchores.4.Thiscanbehavingacupofcoffeeasyoureadyourfavoriteblogetc.Chooseactivitiesyouenjoyandthatsetyouonagoodpathfortheday You'veimprovedyourstateofmindyourhealthandyourproductivity﹣allbeforetheweekdayhasevenbegun. 5. A.Picksomethingenergeticthatyouandothersinthehouseenjoyandputitonwhileyougetready B.Nowyou'rereadytoconqueryourto﹣dolistfortodayandeveryday C.Doregularexerciseinthemorning D.Moveontotheotherarm E.Exerciseabit﹣Onanemptystomach F.Takeuptheentirelengthofthebedwhenyoustretch G.Butifthefirstthingyoudoispleasantyou'llfinditmucheasiertogetgoing
已知扇形AOB的面积为圆心角AOB为120°则该扇形半径为.
函数y=x2+ln|x|的图象大致为
WilkieCollinswasborninLondonin1824andhisfirstnovel﹣﹣ahistoricalromancecalledAnatonia﹣﹣waspublishedwhenhewas26.ShortlyafterthishemetCharlesDickensandtheyformedaclosefriendshipthatlastedfortenyearsandinfluencedbothmen'swriting.Collinswentontopublish25novelsaswellasmanyshortstoriesplaysandworksofnon﹣fiction.HoweverheismostwellknownforthetwomysterynovelsTheWomaninWhiteandTheMoonstone. CollinspublishedbothmysteriesasserialsinAlltheYearRound.Whenitappearedinthemagazinein1860TheWomaninWhitewassopopularthatitbecamethesubjectofasongandaplay.Iteveninfluencedfashionandmanywomenstartedtodressinwhite.EightyearslaterTheMoonstonewaspublishedandearnedCollinsthetitlethefatherofthemodernEnglishdetectivenovel.TSElliotanotherfamouswritersaidthatTheMoonstonewasthefirstandgreatestofEnglishdetectivenovelsanditisstilladmiredbymoderncrimewriterstoday. AnauthorofmanymysteriesDorothyLSayersconsideredTheMoonstonetobeprobablythefinestdetectivestoryeverwrittenandmanypeopleagreewithher.Thereareseveralreasonswhytheythinkso.OneisthatCollinsusesdifferentcharacterstotelleachsectionofthestory.Thecharactershaveverydifferentpersonalitiesandvoiceswhichareinterestingandoftenamusing.Therearealsoseveralfeaturesoftheplotwhichstartedtrendsinmysterywriting.Forexamplemanydetectivestoriesaresetinacountryhousewherethetheftmusthavebeencommittedbyoneofthepeopleinthehouse.Thecharacterofafamousdetectivewithanunusualappearanceandhabitsoccursinmanybooksandaninnocentpersonisoftenundersuspicionatfirst.Anumberofmodernfilmshavealsousedtheideaofacursedjewelstolenfromareligiousstatue.AndofcourseinTheMoonstoneandmostothergoodmysterynovelsthepersonwhoatfirstseemstheleastlikelytobethecriminalturnsouttobeguilty. 25.Anatoniawaspublishedin. A.1824B.1850C.1860D.1868 26.AlltheYearRoundwasatitleof. A.oneofWilkieCollins'books B.oneofCharlesDickens'books C.astoryofamagazine D.amagazine 27.CollinsisknownasthefatherofthemodernEnglishdetectivenovelbecause. A.hewasolderthantheotherdetectivestorywriters. B.hissonwasalsoafamousdetectivestorywriter. C.manyaspectsofhiswritingarecopiedbyotherdetectivestorywriters. D.theMoonstoneisthemostpopulardetectivestory.
已知函数作如下变换y=gxy=hxy=txy=fx1分别求出函数y=gx的对称中心和单调增区间2写出函数y=fx的解析式值域和最小正周期.
6分 FrancesStevensReeseWooldlandTrailGuide TheWoodlandTrailwasopenedtothepubliconOctober211997.Boscobel'sBoardofDirectorsadoptedaformaldecisionofnamingtheWoodlandTrailinhonorofformerBoscobelboardmemberFancesStevensReese1917﹣2003oneyearafterhisdeath. Thetrail小径isapproximately10milesinlengthleadingdowntoConstitutionForest.WhentheWestPointGlassFactorywasoperatingduringtheCivilWartreesformilesaroundwereclearedtoprovidefirewood.Walkingoutoftheforestyouwillfindalargemassofnativehardrockaboutthreebillionyearsold. Throughoutthiscountrypathyouwillfindpictureboardsidentifyingbirdsandplantslocaltothisregion.Youwillalsofindsignswithhistoricandenvironmentalinformationwrittenbyareaspecialists. Whenyoutakeawalkthroughthisundiscoveredforestlandpleasebeaconsiderateguest. 〇BeforewalkingthetrailpleasepurchaseapassintheCarriageHouse.Planaheadsoyouwillbebackbyclosingtime. 〇Followthetrailmarkersandremainonthetrail.Besidesprotectingthefragileforestecosystemyouwillreducetheriskofpoisonplantsandsnakes. 〇Leaverocksplantsanimalsandartworkswhereyouseethemsothatthepersonbehindyoucanhavethesameexperience. 〇Carryoutwhateveryoucarryinbecausetherearenorubbishcontainersonthetrail.Ifyouhappentoseeapieceoflitterbeagoodguestandpickitup. 1WhenwasthetrailnamedtohonorFrancesStevensReese A.In1997. B.In1917. C.In2003. D.In2004. 2Whatcanyouseealongthetrail A.Anoldbattlefield. B.Aglassfactory. C.Informationsigns. D.Rockhouses. 3Whatshouldyoudoasathoughtfulvisitor A.Leavethewildlifeundisturbed. B.Throwtherubbishintothedustbins. C.MakereservationsintheCarriageHouse. D.ProtectthemarkersoftheWoodlandTrail.
如图所示用质量为m面积为S的可动水平活塞将一定质量的理想气体密封于悬挂在天花板上的气缸中当环境的热力学温度为T0时活塞与气缸底部的高度差为h0由于环境温度逐渐降低活塞缓慢向上移动距离△h.若外界大气压恒为p0密封气体的内能U与热力学温度T的关系为U=kTk为取正值的常数气缸导热良好与活塞间的摩擦不计重力加速度大小为g求此过程中 1外界对密封气体做的功W 2密封气体向外界放出的热量Q.
在△ABC中已知角ABC的对边分别为abc若a=n+1b=nc=n﹣1n∈N+且A=2C则△ABC的最小角的余弦值为
如图所示一棱镜的截面为直角三角形ABC∠A=30°斜边AB=8cm棱镜材料的折射率n=在此截面所在的平面内一条光线以60°的入射角从AC边的中点M射入棱镜求出射点到B点的距离不考虑光线沿原路返回的情况
计算sin+tan=
已知向量=snx﹣2cosx=2cosxcosx函数fx=•+1x∈R. 1求函数fx的单调递增区间 2在△ABC中内角ABC所对边的长分别是abc若fA=2C=c=2求△ABC的面积S△ABC.
8分ChoosingtoforgetsomethingmighttakemorementaleffortthantryingtorememberitresearchersatTheUniversityofTexasatAustindiscoveredthroughneuroimaging神经成像. ThesefindingspublishedintheJournalofNeurosciencesuggestthatinordertoforgetanunwantedexperiencemoreattentionshouldbefocusedonit.Thissurprisingresultcontinuespreviousresearchonintentionalforgettingwhichfocusedonreducingattentiontotheunwantedinformationthroughredirectingattentionawayfromunwantedexperiencesorholdingbackthememory'sretrievals恢复. WemaywanttogetridofmemoriesthatcausenonadaptiveresponsessuchasupsettingmemoriessothatwecanrespondtonewexperiencesinmoreadaptivewayssaidJarrodLewis﹣Peacockthestudy'sseniorauthorandanassistantprofessorofpsychologyatUTAustin.Decadesofresearchhasshownthatwehavetheabilitytovoluntarilyforgetsomethingbuthowourbrainsdothatisstillbeingquestioned.Oncewecanfigureouthowmemoriesareweakenedanddesignwaystocontrolthiswecandesigntreatmenttohelppeopleridthemselvesofunwantedmemories. Usingneuroimagingtotrackpatternsofbrainactivitytheresearchersshowedagroupofhealthyadultsimagesofscenesandfacesinstructingthemtoeitherrememberorforgeteachimage.Theirfindingsnotonlyconfirmedthathumanshavetheabilitytocontrolwhattheyforgetbutthatsuccessfulintentionalforgettingrequiredmoderate适中的levelsofbrainactivityinthesesensoryandperceptualareas感官区域﹣moreactivitythanwhatwasrequiredtoremember. Amoderatelevelofbrainactivityiscriticaltothisforgettingmechanism.Toostronganditwillstrengthenthememorytooweakandyouwon'tchangeitsaidTracyWangleadauthorofthestudyandapsychologypostdoctoralfellowatUTAustin.Importantlyit'stheintentiontoforgetthatincreasestheactivationofthememoryandwhenthisactivationhitsthe‘moderatelevel'sweetspotthat'swhenitleadstolaterforgettingofthatexperience.Theresearchersalsofoundthatparticipantsweremorelikelytoforgetscenesthanfaceswhichcancarrymuchmoreemotionalinformationtheresearcherssaid. We'relearninghowthesemechanismsinourbrainrespondtodifferenttypesofinformationanditwilltakealotoffurtherresearchandreplication重复ofthisworkbeforeweunderstandhowtocontrolourabilitytoforgetsaidLewis﹣Peacockwhohasbegunanewstudyusingneurofeedbacktotrackhowmuchattentionisgiventocertaintypesofmemories. Thiswillmakewayforfuturestudiesonhowweprocessandhopefullygetridofthosereallystrongstickyemotionalmemorieswhichcanhaveapowerfuleffectonourhealthandwell﹣beingLewis﹣Peacocksaid. 1Previousstudiesonintentionalforgettingresearched. A.thepatternofbrainactivity B.theprocessofrecoveringamemory C.thewaytoreduceattentiontounwantedinformation D.theamountofattentionrequiredbyintentionalforgetting 2AccordingtoTracyWangforgettingispossiblewhen. A.peoplerespondtonewexperiencesinanadaptiveway B.theactivationofthememoryreachesacertainlevel C.peoplehavethestrongestintentiontoforget D.theinformationinvolvesmoreemotion 3Lewiscontinueshisstudytofindout. A.howtocontrolpeople'sabilitytoforget B.wheretoapplythefindingsofhisteam'slateststudy C.whateffectsupsettingmemorieshaveonpeople'shealth D.ifdifferenttypesofinformationrequiresdifferentlevelsofattention 4Whatisthebesttitleofthearticle A.Wheredoesforgettingtakeplace B.Howdoesattentionaffectmemory C.Forgettingusesmorebrainpowerthanremembering D.Forgettingisfarmoredifficultthanweonceimagined
已知角αβ满足0<α+β<π且则cos2β的值为
某单位共有老中青职工430人其中青年职工160人中年职工人数是老年职工人数的2倍.为了解职工身体状况现采用分层抽样方法进行调查在抽取的样本中有青年职工32人则该样本中的老年职工人数为
已知ab∈Rab≠0两圆x2+y2+2ax+a2﹣4=0和x2+y2﹣4by﹣1+4b2=0只有一条公切线则的最小值为
Dandelions蒲公英arecommonweedsthatgrowinmanyplacesaroundtheworld.Indifferent41dandelionstakedifferentshapes.Scientistshavelong42thatdifferenthabitatsledtothecreationof43speciesandthatdifferencesinformareactualproofofdifferentspecies.44accordingtoTuressonitisalsopossiblethata45speciestakesdifferentshapesdependentonthehabitatsit46in.TostudythisIhavelookedattwodandelionsgrowingindifferenthabitats.Theone47IwillcallDandelion1growsinagrassfieldthatliesinthe48.TheotherDandelionDandelion2growsintheshadoweg49thetreesorbehindashed.Thegrassfieldishotand50.Theshadowiscoolandwet.Sowhatarethe51betweenDandelion1and2?Dandelion1isdarkgreenandits52areshortandquitethick.Mostoftheleaveslie53onthesurroundinggrass.Theflowersareshort.Dandelion2ontheotherhandlooksverydifferently.Theleavesarelongand54greenMostleavesstandinaverticalposition.Theflowersalso55tall.Dandelion256strongandtall.Itisclearthatitgrowsverywellinthe57andthathasenough58andspacetogrowintoabigplant.Dandelion1ontheotherhandissmallanddark.Itseemsthatthe59inthegrasslandmakeitdifficultforthisdandeliontogrowintoabigplant.60theconditionsinthetwodifferenthabitatsresultindifferentshapesforthesedandelions.ForDandelion1thesunmakesthegrassfieldhotanddry.Inordertosavewateritgrowsshortandthickleaves.41.A.houses B.habitats C.parks D.countries42.A.disagreed B.provided C.believed D.calculated43.A.new B.good C.old D.bad44.A.However B.Therefore C.Thus D.Otherwise45.A.same B.different C.strange D.single46.A.plants B.works C.takes D.grows47.A.what B.which C.that D.when48.A.world B.mountain C.sun D.valley49.A.under B.over C.upon D.between50.A.humid B.wet C.soft D.dry51.A.similarities B.advantages C.differences D.disadvantages52.A.seeds B.leaves C.weeds D.woods53.A.flat B.apart C.dead D.logical54.A.dark B.bright C.artificial D.familiar55.A.lie B.break C.stand D.perform56.A.sounds B.smells C.feels D.looks57.A.swallow B.shallow C.shadow D.shape58.A.sunshine B.leaves C.honey D.water59.A.conditions B.occasions C.situations D.preparations60.A.Fortunately B.Obviously C.Consequently D.Accidentally
sin﹣的值是
Manyscholarshipsrequirethatyouwriteanessayinordertobeconsideredfortheprizemoney.Howeverifyouarethesortofpersonthathasaheadachewheneveryouhavetocompleteawritingassignmentthismaynotbethebestnews.Luckilyforyouthereisnoreasontofearthescholarshipessay.Thefollowingtipscouldhelpyouconquerthisnot﹣so﹣easyaspectofthescholarshipapplicationprocess. Youshouldalwaysoutlineyouressays.Thisdoesnotjustapplytothescholarshipessayseither.Anoutlinehelpslendfocustoyourthoughtsandhelpsyoucreateapictureofthewholethattheessaywillbecome.Judgescannottostandwhenyourwritingislooselackscoherence连贯性orwhenyoufailtoconnectyourmainpointstogether.Theywanttoseethatyoucansupportyourargumentwellwithclearandbriefexamplesandthattheseexamplesdoinfactrelatetothetopicathand. Ifyouhaveachoiceinthetopicyougettowriteaboutalwaystrytoselectsomethingyouarepersonallyinterestedin.Don'twritewhatyouthinkthejudgeswanttohear.Thiswillonlyamountinanessaythatreadslikesomeoneelse'swhichisnotagreatwaytomakeyourselfstandout. Ifyoufeelboredwiththetopicthenyouressaywillbeboringaswell.Makesureyourideafollowaclearandalogicalpath.Thismeanstheyareconnectedwellandthetransitions过渡easilyflowfromoneideatothenext.Likewisetrytostayawayfromtheobviousorthesadstory.Yescollegewillbealife﹣changingexperiencebutcanyouthinkofaninterestingreasonwhythisisso?Andyesitisterriblethatyoulostafamilymemberatayoungagebutwhatdoesithavetodowithwinningthisscholarship?Judgescansmellsadstoriesfromamileawaysoonlypullattheheartstrings动人心弦ifyouhaveaproperreasonfordoingso. 32.Whenwritingascholarshipessayanoutlineisnecessarybecauseithelpsyou. A.focusonthedetailsoftheessay B.thinkmoreaboutthescholarship C.makeapictureofthewholeessay D.supportyourargumentwell 33.Youressaywillbeappreciatedbyjudgesifit. A.turnsouttobeloose B.isshortofcoherence C.isunabletoconnecttothemainpoints D.supportsyourargumentwithbriefexamples 34.Whatistheauthor'sopiniononchoosingthetopicforascholarshipessay? A.Theessayshouldincludetheobviousorthesadstory. B.Youmustkeepyourmindclearandlogical. C.Youhadbettertrytoputaninterestingstoryinit. D.Trytosayasmuchasyoucanaboutyourfamily. 35.Theintendedreadersofthepassageareprobably. A.collegestudents B.judgesincolleges C.essayreaders D.companyleaders.
已知四面体ABCD中EF分别是ACBD的中点若AB=2CD=4EF与CD所成角的度数为30°则EF与AB所成角的度数为
已知等比数列{an}为递增数列a2a5=32a3+a4=12数列{bn}满足bn=log2an. 1求数列{bn}的通项公式 2求数列{anbn}的前n项和Sn.
已知平面向量满足若则的值为
如图四边形ABCD是平行四边形平面AED⊥平面ABCDEF∥ABAB=2BC=EF=1AE=DE=3∠BAD=60°G为BC的中点. Ⅰ求证FG∥平面BED Ⅱ求证平面BED⊥平面AED Ⅲ求直线EF与平面BED所成角的正弦值.
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