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设复数z满足iz=|2+i|+2i,则|z|=( )
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高三上学期数学《》真题及答案
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已知复数z满足iz=1+2i则z的虚部是
-i
-1
2
2-i
设复数z满足iz=|2+i|+2i则|z|=
3
9
10
若复数Z满足iz=2+4i则z=
4﹣2i
2﹣4i
2+4i
4+2i
复数z满足iz=3+4ii是虚数单位则z=
.设复数z满足﹣iz=3+2i1﹣i其中i为虚数单位则z=.
设复数z满足z•i=2﹣ii为虚数单位则z=________
设复数z满足z1+i=2i为虚数单位则复数z的虚部是
1
﹣1
i
﹣i
设复数z满足z-2i2-i=5则z=
2+3i
2-3i
3+2i
3-2i
记复数z的虚部为Imz已知z满足iz=1+2i则Imz为
﹣1
﹣i
2
2i
设复数z满足z-2i2-i=5求z.
设复数z满足z1+2i=2-i则|z|=.
设复数z满足iz=|2+i|+2i则|z|=
3
9
10
设复数z满足1﹣iz=3+i则z=
1+2i
2+2i
2﹣i
1+i
设复数z满足iz=1+2i则复数z的共轭复数为.
设复数z满足z·i=2-ii为虚数单位则z=.
若复数z满足iz=2+4i则在复平面内z对应的点的坐标是
(2,4)
(2,﹣4)
(4,﹣2)
(4,2)
设i是虚数单位复数z和w满足zw+2iz-2iw+1=01若z和w又满足-z=2i求z和w值2求证如
设复数z满足z1+i=2+4i其中i为虚数单位则复数z的共轭复数为__________.
设复数z满足z•i=2﹣ii为虚数单位则z=.
已知复数z满足iz=|3+4i|﹣i则z的虚部是
﹣5
﹣1
﹣5i
﹣i
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设x>0y>0若成等差数列则的最小值为
设函数fx=对任意x1x2∈0+∞不等式恒成立则正数k的取值范围是.
常温下对于①0.1mol/LCH3COOH溶液②pH=1的HCl溶液③pH=13的NaOH溶液④0.1mol/LCH3COONa溶液下列说法正确的是
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在公差不为零的等差数列{an}中2a3﹣a72+2a11=0数列{bn}是等比数列且b7=a7则log2b6b8的值为
街头艺术家运用创意将鲜艳明亮的色彩带进了老社区.bring.
Youthsporthasthepotentialtoaccomplishthreeimportantobjectivesinchildren'sdevelopment.Firstsportprogramscanprovideyouthwithopportunitiestobephysicallyactivewhichcanleadtoimprovedphysicalhealth.Secondyouthsportprogramshavelongbeenconsideredimportanttoyouth'spsychosocialdevelopmentprovidingopportunitiestolearnimportantlifeskillssuchascooperationdisciplineleadershipandself﹣control.Thirdyouthsportprogramsarecriticalforthelearningofmotorskillsthesemotorskillsserveasafoundationforfuturenationalsportstarsandrecreationaladultsportparticipants.Whencoachersdevelopactivitiesforyouthpracticesandwhensportorganizationsdesignyouth﹣sportprogramstheymustconsidertheimplicationofdeliberateplayanddeliberatepractice. ResearchfromTelama2006statesthatregularparticipationindeliberateplayordeliberatepracticeactivitiesduringchildhoodandyouthagesninetoeighteenincreasesthelikelihoodofparticipationinsportsduringadulthoodbysixtimesforbothmalesandfemales.Côté2002definesdeliberateplayactivitiesinsportasthosedesignedtomaximizeenjoyment.Theseactivitiesareregulatedbyflexiblerulesadaptedfromstandardizedsportrulesandaresetupbythechildrenorbyaninvolvedadult.Childrentypicallychangerulestofindapointwheretheirgameissimilartotheactualsportbutstillallowsforplayattheirlevel.Forexamplechildrenmaychangesoccerandbasketballrulestosuittheirneedsandenvironmente.g.inthestreet.onaplayingfieldorinsomeone'sbackyard.Wheninvolvedindeliberateplayactivitieschildrenarelessconcernedwiththeoutcomeoftheiroutcomeoftheirbehavior.whethertheywinorlosethanwiththebehavior.havingfun. OntheotherhandEricsson1993suggeststhatthemosteffectivelearningoccursthroughinvolvementinhighlystructuredactivitiesdefinedasdeliberatepractice.Deliberatepracticeactivitiesrequireeffortproducenoimmediaterewardsandaremotivatedbythegoalofimprovingperformanceratherthanthegoalofenjoyment.Whenindividualsareinvolvedindeliberateplaytheyexperimentwithdifferentcombinationsofbehaviorsbutnotnecessarilyinthemosteffectivewaytoimproveperformance.Incontrastwhenindividualsareinvolvedindeliberatepracticetheyexhibitbehavior.focusedonimprovingperformancebythemosteffectivemeansavailable.Forexamplethebackhandskillsintenniscouldbelearnedandimprovedovertimebyplayingmatchesorbycreatingfunpracticesituations.Howeverplayerscouldmoreeffectivelyimprovetheirbackhandperformancebypracticingdrillsthatmightbeconsideredlessenjoyable.Althoughdrillsareusedinmosteffectivemeansavailablepracticemightnotbethemostenjoyabletheymightbethemostrelevanttoimprovingperformance. NoteAnswerthequestionsorcompletethestatementsinNOMORETHANTENWORDS 78.Besidesthelearningofmotorskillswhataretheothertwoimportantobjectivesofyouthsport?. 79.Ifchildrenparticipateindeliberateplayordeliberatepracticeactivitiestheyaremorelikelyto. 80.Indeliberateplayactivitieswhatdochildrendotomaximizeenjoyment?. 81.Incontrasttodeliberateplaydeliberatepracticeisaimedat.
已知数列{an}中a1=1当n≥2时其前n项和Sn满足=anSn. 1求Sn的表达式 2设bn=求数列{bn}的前n项和Tn.
Ifyoustudiedpicturesthatancientpeopleleftonrockwallsandyoutriedtodeterminetheirmeaningyouwouldnotdetectinterestinromanceamongtheartists.51youwouldseeplentyofanimalswithpeoplerunningafterthem.Lifeforancientpeople'searnedtocenteronhuntingandgatheringwildfoodsformeals. Inmoderntimeswhenfoodisavailableingrocerystoresfindingloveismore52inpeople'slives.The53isallaroundus.Itiseasytopreparealistofmodernstorieshavingtodowithlove.Anendlessnumberofbooksandmoviesqualifyaslovestoriesinpopularculture. Researchersarestudyingwhetherloveahighlyvaluedemotionalstatecanbe54.Theyaskwhatislove?Toothpastecompanieswantustothinkattractionisallaboutcleanteethbutcleanteethgoonlysofar.Scientistswonderhowmuchthebraingetsinvolved.Youhaveprobablyheardthatoppositesattractbutthat55attracttoo.OnethingiscertainThetruthaboutloveisnotyetsetinstone. FirstImpression Tohelpdeterminethe56ofattractionresearcherspaired164collegeclassmatesandhadthemtalkfor36or10minutessotheycouldgetasenseofeachother'sindividuality.Thenstudentswereaskedto57whatkindofrelationshiptheywerelikelytobuildwiththeirpartners.Afternineweekstheyreportedwhathappened. Asitturnedouttheir58judgementsoftenheldtrue.Studentsseemedto59atanearlystagewhowouldbestfitintotheirlives. The60Knows Scientistshavealsoturnedtononhumanstoincreaseunderstandingofattraction.Manyanimalsgiveoffpheromones﹣naturalchemicalsthatcanbedetectedbyandthencanproducearesponseinotheranimalsofthesamespecies.Pheromonescansignalthatananimaliseitherreadytofightorisfeeling61topartnerships.Incontrasthumansdonotseemtobeas62asotheranimalsatdetectingsuchchemicals.Smellhoweverdoesseemtoplayapartinhumanattraction.Althoughwemaynotbeawareofchemicalslikepheromonesconsciouslywegiveandreceiveloadsofinformationthroughsmellineveryinteractionwithotherpeople. FaceValue Beingfondofsomeoneseemstohaveanumberoffactorsincludingseeingsomethingwefindattractive.Researchershadpeoplejudgefacesfor63.Theparticipantshad0.013secondstovieweachfaceyetsomehowtheygenerallyconsideredtheimagesthesameaspeoplewhohadmoretimetostudythesamefaces.Thewaywe64attractivenessseemtobesomewhatautomatic. Whenshownanattractivefaceandthenwordswithgoodorbadassociationspeoplerespondedto65wordsfasterafterviewinganattractiveface.Seeingsomethingattractiveseemstocausehappythinking. 51.A.Instead B.Therefore C.Moreover D.Otherwise 52.A.romantic B.stressful C.central D.beneficial 53.A.priority B.proof C.possibility D.principle 54.A.tested B.imposed C.changed D.created 55.A.appearances B.virtues C.similarities D.passions 56.A.illustrations B.imaginations C.ingredients D.instructions 57.A.predict B.investigate C.diagnose D.recall 58.A.critical B.initial C.random D.mature 59.A.memorize B.distinguish C.negotiate D.question 60.A.Nose B.Eye C.Heart D.Hand 61.A.open B.alert C.resistant D.superior 62.A.disappointed B.amazed C.confused D.gifted 63.A.emotion B.attractiveness C.individuality D.signals 64.A.enhance B.possess C.maintain D.assess 65.A.familiar B.plain C.positive D.insulting.
已知三棱锥P﹣ABC的四个顶点均在半径为的球面上且PA=BC=5AB=CP则三棱锥P﹣ABC的体积是.
“a=1”是“函数y=cos2ax﹣sin2ax的最小正周期为π”的
70.InthefilmreviewwhatisparagraphAmainlyabout?. A.Theintroductiontotheleadingroles B.Thewriter'sopinionofacting C.Thewriter'scommentsonthestory D.Thebackgroundinformation 71.AccordingtothefilmreviewmonsterparagraphBrefersto. A.agun﹣crazyhunter B.abrainydog C.ascaryrabbit D.agiantvegetable 72.Whichofthefollowingisareasonwhythewriterrecommendsthefilm? A.It'sfullofwitandhumour. B.Itscharactersshowfeelingswithoutwords. C.ItisanadventurefilmdirectedbyPeterSallis. D.Itisabouttheharmonybetweenmanandanimals.
在△ABC中若2=•+•+•则△ABC是
肼N2H4又称联氨广泛用于火箭推进剂有机合成及燃料电池NO2的二聚体N2O4则是火箭中常用氧化剂.试回答下列问题 1肼燃料电池原理如图所示左边电极上发生的电极反应式为 2火箭常用N2O4作氧化剂肼作燃料已知 N2g+2O2g=2NO2g△H=﹣67.7kJ•mol﹣1 N2H4g+O2g=N2g+2H2Og△H=﹣534.0kJ•mol﹣1 2NO2g⇌N2O4g△H=﹣52.7kJ•mol﹣1 试写出气态肼在气态四氧化二氮中燃烧生成氮气和气态水的热化学方程式. 3联氨的工业生产常用氨和次氯酸钠为原料获得也可在高锰酸钾催化下尿素[CONH22]和次氯酸钠﹣氢氧化钠溶液反应获得尿素法反应的离子方程式为. 4如图所示A是由导热材料制成的密闭容器B是一耐化学腐蚀且易于传热的透明气囊.关闭K2将各1molNO2通过K1K3分别充入AB中反应起始时AB的体积相同均为aL. ①B中可通过判断可逆反应2NO2⇌N2O4已经达到平衡. ②若平衡后在A容器中再充入0.5molN2O4则重新到达平衡后平衡混合气中NO2的体积分数填“变大”“变小”或“不变” ③若容器A中到达平衡所需时间ts达到平衡后容器内压强为起始压强的0.8倍则平均化学反应速率vNO2等于. ④若打开K2平衡后B容器的体积缩至0.4aL则打开K2之前气球B体积为L.
AskhelpfulHannah DearhelpfulHannah I'vegotaproblemwithmyhusbandSam.HeboughtasmartphoneacoupleofmonthsagoandhetookitonourrecentskivacationtoColoradoitwasagreattripexceptforoneproblem.Hehasaconstanturge33checkfornextmessageshecheckshisphoneeveryfiveminutes!He'ssoaddictedtoitthathejustcan'tstandtheidea34theremaybeanimportanttext.Hecan'thelpcheckingevenatinappropriatetimeslikewhenweareeatinginarestaurantandIamtalkingtohim!Hebehaves35anysmallamountofboredomcanmakehimfeeltheneedtocheckhisphoneevenwhenheknowheshouldn't.Thetemptationtosee36isconnectinghimisjusttoogreat.WhenIaskhimtoputdownthephoneandstop37ignoremehesayInaminute.butstillcheckstoseeif38haspostedsomethingnewontheInternet.Ourlife39interrupt.IfwegosomewhereandIaskhimtohavethephoneathomehesuffersfromwithdrawalsymptom.Maythisdependencyonhissmartphonehasbecomemorethananeverydayproblem. Irecentlyreadanarticleaboutnomophobia40isarealillnesspeoplecan'tsufferfromthefearofbeingwithoutyourphone!IamworriedthatSammaybesufferingfromthisillnessbecausehefeelsanxiousifhedoesn'thavehisphonewithhimevenforashorttime. Whowouldhavethoughtthatlittledeviceslikethesecouldhavebroughtsomuchtrouble! SickandTiredSadie. 33. 34. 35. 36. 37. 38. 39. 40.
某课外小组欲探究在适当温度和催化剂的条件下SO2与O2反应后混合气体的成分.已知①沸点SO2﹣10℃SO345℃②SO3遇水剧烈反应放出大量热产生酸雾.③98.3%H2SO4可以吸收SO3和酸雾. 提供的药品Na2SO3固体10mol/LH2SO4催化剂V2O5KMnO4固体蒸馏水0.5mol/LBaCl2溶液98.3%H2SO42.0mol/LNaOH溶液品红溶液等. 1该小组同学用Na2SO3固体与10mol/LH2SO4混合制取SO2.发生装置应该选用下图中装置填字母. 2若选用上图中b装置制O2反应的方程式是. 3该小组同学为检验反应后混合气体的成分设计如下装置 ①b中发生反应的化学方程式是. ②c中盛放的试剂是e中盛放的试剂是其作用是. ③某同学提出用饱和的NaHSO3溶液代替98.3%的浓H2SO4请你评价该方案是否可行若可以不必说明理由若不可行简述其理由.
设a∈则使函数y=xa的定义域是R且为奇函数的所有a的值是
设向量满足||=||=1=﹣则|2|=.
若存在实常数k和b使得函数Fx和Gx对其公共定义域上的任意实数x都满足Fx≥kx+b和Gx≤kx+b恒成立则称此直线y=kx+b为Fx和Gx的“隔离直线”.已知函数fx=x2x∈Rgx=x<0hx=2elnx.有下列命题 ①Fx=fx﹣gx在x∈﹣0内单调递增 ②fx和gx之间存在“隔离直线”且b的最小值为﹣4 ③fx和gx之间存在“隔离直线”且k的取值范围是﹣40] ④fx和hx之间存在唯一的“隔离直线”y=2x﹣e. 其中真命题的个数有
学校即将举办读书节目前正广泛征集读书节宣传册图片.假设你是该校学生潘阳你已找到以下三幅图片决定给读书节组委会写一封信推荐其中一幅你的信须包括以下内容 1.简单描述你想推荐的那幅图片 2.阐述你用这幅图片宣传读书节的理由.
在△ABC中abc分别为角ABC所对的边且bcosC=3acosB﹣ccosB. Ⅰ求cosB的值 Ⅱ若=2且求a和c的值.
下列说法正确的是
已知单调递增的等比数列{an}满足a2+a3+a4=28且a3+2是a2a4的等差中项. Ⅰ求数列{an}的通项公式 Ⅱ若bn=﹣nanSn=b1+b2+…+bn对任意正整数n总有Sn+n+man+1<0成立试求实数m的取值范围.
以直角坐标系的原点O为极点x轴的正半轴为极轴且两个坐标系取相等的长度单位.已知直线l的参数方程为t为参数0<α<π曲线C的极坐标方程为ρsin2θ=4cosθ. 1求曲线C的直角坐标方程 2设直线l与曲线C相交于AB两点当α变化时求|AB|的最小值.
已知函数. 1证明曲线y=fx在x=1处的切线恒过定点并求出该定点的坐标 2若关于x的不等式fx≤b﹣1x恒成立求整数b的最小值.
已知函数fx=|2x﹣a|﹣|2x+3|gx=|x﹣1|+2. 1解不等式|gx|<5 2若任意x1∈R都有x2∈R使得fx1=gx2成立求实数a的取值范围.
下列实验能达到预期目的是 ①用乙醇和浓硫酸除去乙酸乙酯中的少量乙酸 ②用饱和NaCl溶液除去Cl2中的少量HCl ③用饱和NaHCO3溶液除去CO2中的少量SO2 ④用加热的方法提取NH4Cl固体中混有的少量碘 ⑤用醋和澄清石灰水验证蛋壳中含有碳酸盐 ⑥用米汤检验食用加碘盐中含碘 ⑦用纯碱溶液洗涤餐具 ⑧用玻璃棒搅拌漏斗中的液体以加快过滤的速度 ⑨加入盐酸以除去硫酸钠中的少量碳酸钠杂质
1AlN的晶体结构与单晶硅相似在AlN晶体中每个Al原子与个N原子相连与N元素同主族的元素As位于元素周期表的第四周期其基态原子的核外电子排布式为. 2A元素的原子价电子排布为ns2np2B元素的最外层电子数是其电子层数的3倍C元素原子的M电子层p亚层中有3个未成对电子D元素原子核外的M层中只有2对成对电子. ①当n=2时AB2属于分子填“极性”或“非极性”. ②若A元素的原子价电子排布为3s23p2ACD三种元素的第一电离能由大到小的顺序是用元素符号表示 3CaO晶胞如右图所示其中Ca2+的配位数为CaO晶体和NaCl晶体的离子排布方式相同CaO晶体的熔点高于NaCl晶体的熔点的主要原因是.
等比数列{an}中a1=2a8=4函数fx=xx﹣a1x﹣a2…x﹣a8则f′0=.
在等差数列{an}中2a1+3a2=112a3=a2+a6﹣4其前n项和为Sn. 1求数列{an}的通项公式 2设数列{bn}满足bn=求数列{bn}的前n项和Tn.
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