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在复平面内，复数z对应的点是z（-1，2），则复数z的共轭复数=（ ）
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高三下学期数学《》真题及答案
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复数z满足等式2一i·z=i则复数z在复平面内对应的点的坐标为____.
设复数z满足=i是虚单位则z的共轭复数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
已知复数则下列说法正确的是
z的虚部为4i
z的共轭复数为1﹣4i
|z|=5
z在复平面内对应的点在第二象限
已知i为虚数单位复数z=1+2ii的共轭复数在复平面内对应的点位于
第一象限
第二象限
第三象限
第四象限
2017年·北京西城二模理科在复平面内复数z对应的点是Z1﹣2则复数z的共轭复数＝
1+2i
1﹣2i
2+i
2﹣i
复数z满足z1﹣i=|1+i|则复数z的共轭复数在复平面内的对应点位于
第一象限
第二象限
第三象限
第四象限
已知i是虚数单位z=1+i为z的共轭复数则复数在复平面上对应的点的坐标为.
2017年·北京西城二模文科在复平面内复数z对应的点是Z1﹣2则复数z的共轭复数=．
已知复数z1=3+2iz2=1-2i则复数z=z1-z2在复平面内对应点Z.位于复平面的
第一象限
第二象限
第三象限
第四象限
已知复数z满足是虚数单位则复数z的共轭复数在复平面内所对应的点的坐标为
（1,1）
（－1，－1）
（1，－1）
（－1,1）
复数z满足1＋iz＝3＋i则复数z在复平面内所对应的点的坐标是
（1，－2）
（－2，1）
（－1，2）
（2，－1）
已知复数z满足是虚数单位则复数z的共轭复数在复平面内所对应的点的坐标为
（1,1）
（－1，－1）
（1，－1）
（－1,1）
在复平面内复数z=则其共轭复数z对应的点位于
第一象限
第二象限
第三象限
第四象限
已知复数z＝a＋i在复平面内对应的点位于第二象限且|z|＝2则复数z等于__________.
若复数z满足iz-1=2i则在复平面内复数z对应的点的坐标是
（1，2）
（2，1）
（1，-2）
（2，-1）
复数z满足z1﹣i＝|1+i|则复数z的共轭复数在复平面内的对应点位于
第一象限
第二象限
第三象限
第四象限
如图在复平面内点
表示复数z，则图中表示z的共轭复数的点是( )
A.A.
B.
C.
D.
若复数z满足z1+i=|1+i|则在复平面内z的共轭复数对应的点位于
第一象限
第二象限
第三象限
第四象限
复数z满足z1﹣i＝|1+i|则复数z的共轭复数在复平面内的对应点位于
第一象限
第二象限
第三象限
第四象限
已知复数z的共轭复数z＝1＋2ii为虚数单位则z在复平面内对应的点位于
第一象限
第二象限
第三象限
第四象限
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Issmilejustafacialexpression?Ofcoursenot!Itisnotonlyusedtoexpresspleasureaffectionandfriendlinessbutalsothecommonestwaytoshowourgoodwillperfectlywithoutsayinganything.AChinesesayingrunsNeverhitapersonwhoissmilingatyou.Itisatime﹣provenfactthatsmileisalanguageallitsown﹣auniversallanguage﹣understoodbythepeopleofeverynationintheworld.Wemaynotspeakthesametongueasourforeignneighborsbutwesmileinthesametongue.Weneednointerpreterforthusexpressinglovehappinessorgoodwill. OnedaywhileshoppinginasmalltowninsouthernCaliforniaitwasmymisfortunetobeapproachedbyaclerkwhosepersonalityconflictedwithmine.Heseemedquiteunfriendlyandnotatallconcernedaboutmyintendedpurchase.Iboughtnothingandmarchedangrilyoutofthestore.Ontheoutsidestoodayoungmaninhisearlytwenties.Hisexpressivebrowneyesmetandheldmineandinthenextinstantabeautifulbrilliantsmilecoveredhisface.ThemagicpowerofthatsmilemadeallbitternesswithinmemeltandIfoundthemusclesinmyownfacehappilyresponding.Beautifuldayisn'tit?Iremarkedinpassing.Thenobeyinganimpulse冲动Iturnedback.IreallyoweyouadebtofgratitudeIsaidsoftly.Hissmiledeepenedbuthemadenoattempttoanswer.AMexicanwomanandtwomenwerestandingnearby.Thewomansteppedforwardandeyedmeinquiringly.CarloshenospeakEnglishshevolunteered.YouwantIshouldtellhimsomething?AtthatmomentIfeltchanged.Carlos'smilehadmadeabigpersonofme.Myfriendlinessandgoodwilltowardallmankindstoodtenfeettall.YesmyreplywasenthusiasticandsinceretellhimIsaid‘Thankyou!'''Thankyou?Thewomanseemedslightlyconfused. IgaveherarmafriendlypatasIturnedtoleave.Justtellhimthat.Iinsisted.He'llunderstandIamsure! Ohwhatasmilecando!AlthoughIhaveneverseenthatyoungmanagainIshallneverforgetthelessonhetaughtmethatmorning.FromthatdayonIbecamesmile﹣consciousandIpracticetheartdiligentlyanywhereandeverywherewitheverybody. 1Thewritermarchedangrilyoutofthestorebecause. A.heboughtnothing B.hewasunluckytomeetwitharigidclerk C.hewasunfriendly D.heconflictedwiththeclerkinthestore 2Whatdoyouthinkofthewoman? A.CuriousandsincerewithgoodEnglish. B.HelpfulandcuriouswithpoorEnglish. C.EnthusiasticanddiligentwithgoodEnglish. D.Warm﹣heartedanddiligentwithpoorEnglish. 3Inthefollowingparagraphthewritermaymention. A.howheusedsmiletosolveproblems B.howhardhetriedtolookfortheyoungman C.thelessonCarolshadtaughthim D.howhebecameabigpersonoftenfeettall 4Whatisthebesttitleforthepassage? A.Arigidclerk. B.Apowerfulsmile. C.Ahelpfulwoman. D.Animpressiveyoungman.
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已知i为虚数单位a为实数复数z＝a﹣2i1+i在复平面内对应的点为M则“a＝1”是“点M在第四象限”的
如图所示一质量为m的小球用长为L的轻绳悬挂于O点初始时刻小球静止于P点．第一次小球在水平拉力F1作用下从P点缓慢地移动到Q点此时轻绳与竖直方向夹角为θθ＜90o轻绳的拉力大小为T1第二次在水平恒力F2作用下从P点开始运动并恰好能到达Q点在Q点时轻绳中的拉力大小为T2．关于这两个过程下列说法中正确的是不计空气阻力重力加速度为g
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复数i是虚数单位的模等于
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ThatholidaymorningIdidn'thavetoattendschool.UsuallyonholidaysMother1Bmetosleepin.AndIwouldcertainlytakefulladvantageofit.Onthisparticularmorning2CIfeltlikegettingupearly. Istoodbymywindowoverlookingthe3Ahavingnothingbettertodo.ButasitturnedoutIwassoontolearnaboutsomething4Dinlife. AsIwatchedseveralpeoplegobygetintotheircarsanddriveoffI5Aanoldmanonabicyclewithabucketonits6Bandabasketofragsandbottlesonitsback﹣carriage.He7Cfromonecartoanotherwashingandcleaningthem.Fromthewateronthegrounditseemedthathehadalready8Dwashingandcleaningaboutadozenormorecars.Hemusthavebeguntoworkquiteearlyinthemorning. Severalthoughts9AmymindasIwatchedhimwork.Hewasn'twell﹣dressed.Hehadonapairofshortsandan10CT﹣shirt.Thebicycleherodewasnotbyanymeansthekindmodern11Dwouldwanttobeseenridingon.Butheseemed12Bwithlife.Therehewasworkinghardathissmallbusiness13Aatpassers﹣byandstoppingtochatnowandthen14Celderlymenandwomenontheirwaytothemarketnearby. Therewasanoticeabletouchof15Dinthewayheseemedtobedoingthings﹣16Athewindscreen挡风玻璃thenstandingbacktoadmireitscrubbing擦净thewheelsand17Cstandingbacktoseewhattheylookedlikeafterthescrub. Itwasa18Atolearn.Ifelt.Atnoageneedonehavetobegfora19Bifonehasgoodhealthandiswillingtoworkhard.ForawhileIfelt20Dofmyself.YoungasIam﹣justsixteenandtherewasthisoldmanwhomusthavebeenusefullyengagedperhapsbeforethesunappearedabovethehorizon. 1A.forces B.allows C.causes D.forbids 2A.otherwise B.therefore C.however D.besides 3A.parkinglot B.busstop C.school D.market 4A.interesting B.surprising C.awful D.useful 5A.noticed B.recognized C.called D.assisted 6A.back B.handle C.wheel D.seat 7A.searched B.left C.moved D.wandered 8A.stopped B.started C.intended D.finished 9A.crossed B.slipped C.disturbed D.inspired 10A.attractive B.shiny C.simple D.expensive 11A.repairmen B.businessmen C.drivers D.cyclists 12A.busy B.content C.careful D.bored 13A.waving B.looking C.laughing D.pointing 14A.about B.for C.with D.like 15A.worry B.respect C.sympathy D.pride 16A.cleaning B.fixing C.replacing D.covering 17A.still B.yet C.again D.soon 18A.lesson B.subject C.skill D.fact 19A.business B.living C.success D.right 20A.tired B.doubtful C.fearful D.ashamed
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一简谐横波沿x轴正方向传播在t＝0时刻的波形图如图所示波刚好传到x＝8m的位置P是平衡位置为x＝1m处的质点并经过0.2s完成了一次全振动Q是平衡位置为x＝4m处的质点M是平衡位置为x＝34m处的质点M点图中未画出则下列说法不正确的是
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Nexttimeyouneeddirectionsmaybeyoucanaskanant.Theselittlecreaturesaremastersofnavigation导航thatsomecanfindtheirwayhomewhetherthey'rewalkingforwardorbackwardaccordingtoastudyinCurrentBiology. Antsoftentravellongtobringbackthefoodtotheirnests.Buthowdotheyknowwherethey'regoing? ResearcherswenttoSpaintomesswithsomedesertants.Theyfoundanactivenestandsurroundeditwithbarriersthatforcedtheforaging搜寻antstofollowaparticularpathbackhome.Oncetheantswerefamiliarwiththemazetheresearcherswouldtakethemuphandthempiecesofacookieandthenputthembackinadifferentlocationonethatrequiredtakinga90degreeturntogettothenest. Theresearchfoundthattheantscarryingasmalleasy﹣to﹣carrypiecewouldrunforwardwithconfidenceandwereabletoheadonhome.Someantshoweverwoulddropthecookieandturnaroundtotakealookatthescenerywhichallowedthesix﹣leggedexpertstoresettheirinnermapscatchtheircookiesandheadintherightdirection. Theseantsseemtouseskyclueslikethepositionofthesuntokeepthemontrack.Whentheresearchersusedamirrortomakeitlooklikethesunontheothersideoftheskythecorneredantswouldturntailfortheoppositedirection. Soantsintegrate整合alotofinformationtosuccessfullybringhomethefood. 1WhatdoesthewordmazeinParagraph3probablyreferto?D A.Anestthatactiveantslivein. B.Anexperimentthatisdoneinthedesert. C.Amethodthathelpstolocatefood. D.Aplacethatconsistsofconfusingpaths. 2Whydidsomeantsstoptolookatthescenery?C A.Togetovertheman﹣madebarriers. B.Toenjoythesceneryalongtheroute. C.Toensurethey'reintherightdirection. D.Tocheckdirectionswiththeirmaps. 3Accordingtothepassagewhatprobablyhelpstheantsfindtheirwayhome?A A.Thepositionofthesun. B.Oneparticularpath. C.A90degreeturn. D.Piecesofacookie. 4Wheredoesthispassageprobablycomefrom?C A.Anadventurenovel. B.Ageographytextbook. C.Asciencemagazine. D.Atouristbrochure.
ItisoneoftheliveliestfestivalsthathappeninBathanditisreturningthisSeptember.TheJaneAustenFestivalkicksoffonSeptember8andrunsfortendaysuntilSeptember17witheventsrunningeverydayandevening. Whataresomeofthefestivalhighlights? GrandRegencyCostumedCharityWalk Thehighlightisusuallythewalkwhichsees600ormorefansdressedinperioddressastheywalkfromRoyalCrescentLawnthroughthecitytoParadeGardens.ItisasplendidsighttoseeinthehistoricGeorgianstreets. WhenSaturdaySeptember9/1100am﹣1230pm WhereRoyalCrescentLawn Tickets£10peradult/FREEtowatch MrWickhamandaneveningwithJaneAusten JaneAusten'smostmemorablecharacterscometolifeattheOldTheatreRoyal.PerformancesincludethehandsomeWickhamAdrianLukis.PeriodmusicandatalkfromhistorianCatherineCurzonwillalsofeature. WhenSundaySeptember10/730pm﹣900pm WhereTheMasonicHallOldTheatreRoyal RegencyDanceWorkshops Thereisnothinglikedancing.Afterall.Iconsideritasoneofthefirstrefinementsofpolishedsocieties…Joininonthefun.Costumesarewelcomebutnotnecessary! WhenThursdaySeptember14/Beginners1030am﹣1200pm/Improvers130pm﹣300pm WhereAssemblyRooms Tickets£15 Arethereanyfreeevents? Yes. AReadingofNorthangerAbbey.Thenovelwillbereadaloudthroughoutthefestival.SectionsofAusten'sfirstnovelaresetinBathandyoucanstillfindthelocationsmentioned! WhenEverydayfromSept.10﹣Sept.17from200pm﹣300pm WhereWaterstonesbookshopMilsomStreetupstairs 1Whatdoestheauthorsayaboutthefestival? A.Itisinhonorofanovel. B.ItstartsonSeptember8. C.ItisheldbeyondBath. D.Itisintendedforthelocals. 2Whereshouldpeoplewearspecialcostumestoattendanevent? A.RoyalCrescentLawn. B.TheMasonicHall C.AssemblyRooms. D.Waterstonesbookshop. 3Whichofthefollowingchargesnomoney? A.JoiningintheGrandRegencyCostumedCharityWalk. B.Attendingalecturefromahistorian. C.GettingAusten'snovelinabookshop. D.Enjoyingthepublicreadingofanovel.
假定你是李华你们班级的节目哈姆雷特Hamlet将参加下个月学校英语文化节话剧drama比赛你给度假中的外教Mr.Hurst写一封电子邮件并附上节目录像请他给予你相关的指导. 注意 1词数100左右 2可适当增加细节以使行文连贯 3邮件的开头和结尾已为你写好. DearMr.Hurst Yours LiHua.
某探究小组做“验证力的平行四边形定则”实验将画有坐标轴横轴为x轴纵轴为y轴最小刻度表示1mm的纸贴在水平桌面上如图a所示．将橡皮筋的一端Q固定在y轴上的B点位于图示部分之外另一端P位于y轴上的A点时橡皮筋处于原长． 1用一只测力计将橡皮筋的P端沿y轴从A点拉至坐标原点O此时拉力F的大小可由测力计读出．测力计的示数如图b所示F的大小为N． 2撤去1中的拉力橡皮筋P端回到A点现使用两个测力计同时拉橡皮筋再次将P端拉至O点．此时观察到两个拉力分别沿图a中两条虚线所示的方向由测力计的示数读出两个拉力的大小分别为F1＝4.2N和F2＝5.6N． ⅰ用5mm长度的线段表示1N的力以O为作用点在图a中画出力F1F2的图示然后按平行四边形定则画出它们的合力F合 ⅱF合的大小为N若F合与拉力F的大小及方向的偏差均在实验所允许的误差范围之内则该实验验证了力的平行四边形定则．
RussGremelnow98yearsolddecideditwastimetodonate﹩2milliontotheIllinoisAudubonSocietyacharity慈善机构topurchasenearly400acresoflandforwildlifeprotection.Gremelwasabletomakethisamazingdonationbecausehepurchased﹩1000worthofWalgreensstock股票sevendecadesagowhosevaluehasgrownrecently. AsinglemanwithnokidsGremelhaslivedinthesameChicagohousefor95yearsandhasalwayslivedsimplyneighborPatrickFalsotoldTODAY.FalsosaidheheardGremelsaymanytimesthemoneywasn'tminetobeginwithandthathealwaysintendedtogiveitaway. TheGremelWildlifeshelterwasfoundedonJune4.IllinoisAudubonSocietypresidentJimHerkertsaidGremel'sdonationwasextremelygenerous.It'sallowingustoprotectareallyvaluableandimportantpossessionandrealizeoneofGremel'swishesthatwecouldfindaplacewherepeoplecouldcomeoutandexperiencenaturethewayhedidasakidHerkerttoldTODAY. AfterdoingallthisthispastweekendGremeladoptedanoldChihuahua吉娃娃犬.Winniethedogwaspickedupasahomelessdogseveralmonthsago.Shesufferedfromakindofcancerwhichwastreated﹣andallsheneededwasalovinghomewhichColleenCollinsthefounderofPerfectPoochesAdoptionAgencywasdeterminedtofind. GremelhadlosthisownbelovedChihuahuaearlierthisyear.WhenhereachedouttoCollinsaboutWinnieshefeltthiscouldbeagoodmatch.ThatfeelinggrewwhenshebroughtWinnietohishouseforameetandgreetandWinniewasintroducednotonlytoGremelbutalsosomeofhisfriendsandneighbors.Onehadbroughtoveralotoffreshstrawberriesallsaidthey'dbetheretohelpoutinanywayneeded. 1PatrickFalsoismentionedinthetextmainlytoexplainC. A.howGremelearnedthemoney B.whatkindofpersonGremelis C.whyGremelmadethedonation D.whereGremelhasbeenliving 2WhatcanwelearnaboutRussGremelfromthetext?B A.Heraisedmanypetdogsinhislife. B.HeboughtWalgreensstockatage28. C.HeadoptedayoungChihuahuarecently. D.Hevolunteeredinwildlifesheltersregularly. 3WhatcanweinferaboutGremel'sneighborsfromthetext?D A.Theyliveinharmonywithanimals. B.TheyareimpressedwithdogWinnie. C.Theyleadahealthyandwealthylife. D.Theyarecaringandkindtoeachother.
Foodisextremelyimportanttoushumanbeingsandriceisoneofthemainfoodintheworld.Australianresearchershavediscoveredawaytogeneticallyengineerricewhichwouldprovidesignificanthealthbenefitstomorethanhalftheworld'spopulation. AstudyundertakenattheUniversityofTasmaniapublishedinarespectedjournaloftheNationalAcademyofSciencesdiscoveredamethodtoincreasetheresistantstarch抗性淀粉contentinricemakingitmoredigestibleandleadingtolowerrateofdiabetes糖尿病andoverweight. StevenSmiththeleadauthorofthestudyandaforeignexpertfortheChinesegovernmentwhohasbeenappointedtoworkoncropimprovementprojectsbytheChineseAcademyofSciencessaidincreasingthehigherresistantstarchcontentgavethisdesignerricemanyaddedhealthbenefits.WehavediscoveredthatwecanincreasetheamountofresistantstarchincookedricewhichcouldprovidehealthbenefitsforalargenumberofpeopleinAsiaandbeyondSmithsaidinamediareleaseonFriday.Thesameapproachcanbeadaptedforuseinothercerealsincludingwheat.Notonlycanithavebenefitsfordiabetesandobesitybutalsofordisordersofthebowel肠includingcancer. Riceisthemainfoodformorethanhalftheworld'spopulationprovidingmuchoftheworldwithmostoftheircalories.SmithsaidthatastherateofdiabetesandobesityinAsiancountriescontinuedtogrowhisdesignerricecouldprovideawaytolimithealthproblems. Notonlydoesresistantstarchreducethepossibilityofa‘sugarhit'butitalsoreducestheappetiteandpromotesthegrowthofthehealthygerms.Smithsaid. SmithdivideshistimebetweentheUniversityofTasmaniaandhisresearchlabinBeijingwherehehopestomakesignificantadvanceinsustainable可持续的living. 1Whatdoweknowaboutthestudy? A.ItispartofChinesecropimprovementprojects. B.Itwillhaveasignificanteffectoncropresearches. C.Itwasjointly联合地carriedoutbyAustraliaandChina. D.Ithelpssolvethefoodproblemforoverhalfoftheworld'spopulation. 2Basedonthetexttheresistantstarch. A.existsinlargeamountsincookedrice B.decreasesthepossibilityofasugarhitandprovidesmorecalories C.ishelpfulindigestionandlowerstherateofoverweightanddiabetes D.increasespeople'sappetiteandimprovesthegrowthofhealthygerms 3TheunderlinedworditinParagraph3refersto. A.resistantstarch B.cookedrice C.theapproach D.mediarelease 4Wheredoesthistextprobablycomefrom? A.Anenvironmentalreport. B.Amedicaljournal. C.Anengineeringtextbook. D.Anagriculturalmagazine.
在某单位的职工食堂中食堂每天以3元/个的价格从面包店购进面包然后以5元/个的价格出售．如果当天卖不完剩下的面包以1元/个的价格全部卖给饲料加工厂．根据以往统计资料得到食堂每天面包需求量的频率分布直方图如下图所示．食堂某天购进了80个面包以x单位个60≤x≤110表示面包的需求量T单位元表示利润． Ⅰ求T关于x的函数解析式 Ⅱ根据直方图估计利润T不少于100元的概率．
Modemlifeismakinguslonelierandrecentresearchindicatesthatthismaybethenextbiggestpublichealthissuefollowingobesityandsubstanceabuse.1Changesinmodemsocietyareconsideredtobethecause.Weliveinnuclearfamilyunitsoftenlivinglargedistancesawayfromourextendedfamilyandfriendsandourgrowingrelianceonsocialtechnologyratherthanface﹣to﹣faceinteractionisthoughttobemakingusfeelmoreisolated孤立的. 2Relocatingtoanewarealosingalovedoneandstartingacourseatuniversityareallkeytimeswhenpeoplefeellonely.Somepeoplebelievethisexperienceoflonelinessmotivatesustoreconnectwithothersandtoseekoutnewfriendshipstoreducethesocialpainthatwefeel.3Butforsomewhenreconnectionisnoteasyornotpossibleandapersonissociallyisolatedhecanremaininthisuncomfortablelonelinessstateforanumberofyearswhichislinkedtopoormentalhealth. Thereareanumberofmisunderstandingsregardingthosewhoexperienceloneliness.Certainlyallofusfeelitfromtimetotime.4Theymaybesociallyisolatedduetodecreasedmobilityandlossoffriendsandpartners.Butitisnotoftenacknowledgedthatlonelinessalsoaffectspeopleatallagesincludingchildrenandisparticularlycommonintheteenageyears. Anothermyth谬见isthatlonelinessistypicallyassociatedwithbeingalonebutitalsoaffectspeoplewhentheyaresurroundedbyothersandwellconnectedsocially.5 A.Theythinkitisusefultous. B.Sowhyarewegettinglonelier? C.Lonelinessaffectsallofusatsomepointinourlives. D.Buthowonearthcanwegetridofthisupsettingfriend? E.Lonelinessalmostaccompaniesusallthetimeandeverywhere. F.Butitiscommonlyknownthatlonelinessparticularlyaffectstheelderly. G.Thisisbecauselonelinessisaboutthequalitynotthequantityofrelationships.
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