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设p：实数a，b满足a＞1且b＞1；q：实数a，b满足；则p是q的（ ）
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高三下学期数学《》真题及答案
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设p实数x满足x2－5ax＋4a20q实数x满足2
设命题p实数x满足x2－4ax＋3a20命题q实数x满足1若a＝1且p∧q为真求实数x的取值范围2若
设命题p实数x满足x2－4ax＋3a20命题q实数x满足1若a＝1且p∧q为真求实数x的取值范围2若
设p实数x满足x2－4ax＋3a2＜0其中a＞0命题q实数x满足1若a＝1且p且q为真求实数x的取值
设命题p实数x满足x2－4ax＋3a20命题q实数x满足1若a＝1且p∧q为真求实数x的取值范围2綈
设p实数xy满足x＞1且y＞1q实数xy满足x+y＞2则p是q的
充分不必要条件
必要不充分条件
充要条件
既不充分也不必要条件
设p实数x满足x2﹣4ax+3a2＜0其中a＞0命题q实数x满足.1若a=1且p∨q为真求实数x的取
设p实数x满足x2－4ax＋3a20命题q实数x满足1若a＝1且p且q为真求实数x的取值范围2若綈p
设命题p实数x满足x-ax-3a＜0其中a＞0命题q实数x满足.1若a=1且p∧q为真求实数x的取值
设p实数xy满足x>1且y>1q实数xy满足x+y>2则p是q的
充分不必要条件
必要不充分条件
充要条件
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设命题p实数x满足x-4ax-a0命题q实数x满足x2-4x+3≤0.1若a=1且p∧q为真求实数x
设p实数xy满足x＞1且y＞1q实数xy满足x＋y＞2则p是q的
充分不必要条件
必要不充分条件
充要条件
既不充分也不必要条件
设命题p实数x满足x2－4ax＋3a20命题q实数x满足1若a＝1且p∧q为真求实数x的取值范围2若
设p实数x满足x2﹣4ax+3a2＜0其中a≠0q实数x满足Ⅰ若a=1p且q为真求实数x的取值范围Ⅱ
设p:实数xy满足x>1且y>1q:实数xy满足x+y>2则p是q的
充分不必要条件
必要不充分条件
充要条件
既不充分也不必要条件
设命题p实数x满足x2﹣a+x+1＜0其中a＞1命题q实数x满足x2﹣4x+3≤0.1若a=2且p∧
已知p实数x满足x2﹣4ax+3a2＜0其中a＞0q实数x满足2＜x≤3.1若a=1且p∧q为真求实
命题p实数x满足a＜x＜3a其中a＞0q实数x满足2＜x≤3.Ⅰ若a=1且p∧q为真求实数x的取值范
设命题p实数x满足|x﹣1|＞a其中a＞0命题q实数x满足＜11若命题p中a=1且p∧q为真求实数x
设命题p实数x满足x2－4ax＋3a20命题q实数x满足1若a＝1且p∧q为真求实数x的取值范围2若
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已知向量的夹角为60°||=2||=4则-=
若函数fx=在-∞+∞上单调递增则m的取值范围是．
Haveyoueverrealizedthatthesmallestcountriesintheworldhavesomuchtooffer?Whetherit'shistoricandculturalheritageorunspoilednaturethesemicrostatesareworthavisit. Grenada Grenadaisasmallcountryintheworld.ItislocatedonislandofCaribbeanwhichisalsoknownasTheIslandofSpiceforseveralspiceslikecinnamongingerandrarenutmeg.Grenadareliesontourism.Itspristinebeacheswarmturquoisewaterandunspoilednaturemakeitawonderfulholidaydestination.Recentlyecotourismhasbeengrowingaswell. SanMarino LocatedwithinItalyandsurroundedbytheApennineMountains.SanMarinoisvisitedbyapproximately2milliontouristsannually.It'sabeautifulcountrywhichalsoclaimstobetheoldestsurvivingstateintheworld!Thereforeitsculturalandhistoricheritageisundoubtedlyfascinating.AlthoughverysmallthemicrostatehasalotofarchitecturalattractionsaswellastheRomagnawhichislovedbyItalianswhoareamongthemainguestshere. Maldives MaldivesislocatedonthebankofIndianOcean.Maldiveshasarangeofdifferenthabitatsincludingdeepseashallowcoastandreefecosystemsfringingmangroveswetlandsanddrylands.VisitorstotheMaldivesdonotneedtoapplyforapre-arrivalvisaregardlessoftheircountryoforiginprovidedtheyhaveavalidpassportproofofonwardtravelandthemoneytobeself-sufficientwhileinthecountry. Andorra It'sapicturesquemicrostatefoundinthePyreneesMountainsborderingSpainandFrance.Over10milliontouristsvisitAndorraeveryyear!Unliketheneighboringcountries'highpricesthecountryhasaduty-freepolicyallowingshopperstoenjoylowercosts.Alsotherearewinterandsummerresortssoyoucanvisitanytime. 1WhomightbeinterestedinGrenada? A.Architects. B.Spicelovers. C.Historians. D.Mountainclimbers. 2Whichofthefollowingisagoodchoiceforpeoplewholikebuildingdesign? A.Maldives. B.SanMarino. C.Andorra. D.Grenada. 3WhatisnotrequiredforatravelertoMaldives? A.Money. B.Apassport. C.Avisa. D.Areturnticket. 4WhatmeasurehasAndorratakentoattracttravelers? A.Offeringlowerprices. B.Adoptingvisa-freepolicy. C.Settingnaturalhabits. D.Developingscenicspot.
ArtificialintelligenceAItechnologymaysoonbeausefultoolfordoctors.Itmayhelpthembetterunderstandandtreatdiseaseslikebreastcancerinwaysthatwereneverbeforepossible. RishiRawatteachesAIattheUniversityofSouthernCalifornia'sUSCClinicalScienceCenterinLosAngeles.HeispartofateamofscientistswhoareresearchinghowAIandmachinelearningcanmoreeasilyrecognizecancerousgrowthsinthebreast.Rawatprovidesinformationaboutcancercellstoacomputer.Hesaysthisdatahelpsthemachinelearn.…Youcanputthedataintocomputersandtheywilllearnthepatternsandthepatternrecognitionisimportanttomakingdecisions. DavidAgusisanotherUSCresearcher.Hesaysmachinesarenotgoingtotaketheplaceofdoctors.Computerswillnottreatpatientsbuttheywillhelpmakecertaindecisionsandlookforthingsthatthehumanbraincan'trecognizebyitself.Onceaconfirmedcancerousgrowthisremoveddoctorsstillhavetotreatthepatienttoreducetheriskofcancerreturning.Theformoftreatmentdependsonthekindofcancer. Currentlyresearcherstakeathinpieceoftissueputitonasmallpieceofglassandaddcolortobetterseethecells.Thatprocesscouldtakedaysorevenlonger.Scientistssayartificialintelligencecandosomethingbetterthanjustcountcells.Throughmachinelearningitcanrecognizecomplexpatternsorstructuresandlearnhowthecellsareorganized. Thehopeisthatmachineswillsoonbeabletomakeaquickidentificationofcancerthatisfreeofhumanmistakes.Allofasuddenwehavethecomputingpowertoreallydoitinrealtime…Wecouldn'thavedonethiswedidn'thavethecomputingpowertodothisseveralyearsagobutnowit'sallchanged.Agusaddsthattheprocesscouldbedoneforalmostnocostinthedevelopingworld.Hesaysthathavingalargeamountofinformationaboutpatientsisimportantforamachinetoeffectivelydoitsjobinmedicine. TheUniversityofSouthernCaliforniaresearchersarenowonlystudyingbreastcancer.Butdoctorspredictartificialintelligencewillonedaymakeadifferenceinallformsofcancer. 1InRishiRawat'sresearch. A.thedataputintocomputerscontributestocancerrecognition B.manycancersarebeingstudiedatthemoment C.machinelearninghasreplaceddoctors'work D.thefocusisonthecureforcancer 2DavidAgus'swordsinParagraph3areusedto. A.providesomeadvicefordoctors B.introducethedevelopmentofcancer C.appealtoscientiststoresearchintocancer D.explainthefunctionofAIintreatingcancer 3Whatcanweinferfromthetext? A.AIcanmakedecisionsfordoctors. B.Developingcountriesmightbelackoffunds. C.AIwillhopefullymakeanaccurateidentificationofcancer. D.Computingpowerhaslonghelpedwiththeidentificationofcancer. 4Whatistheauthor'sattitudetowardsAIusedintreatingcancer? A.Positive. B.Indifferent. C.Doubtful. D.Negative.
等比数列{an}的各项均为正数a1=1a1+a2+a3=7则a3+a4+a5=
在△ABC中2sinA•sinB=tanA•tanB． Ⅰ求∠C的大小 Ⅱ求sinA-cosB的取值范围．
如图在四棱锥P-ABCD中BC∥ADAD=2BC点E是棱PD的中点PC与平面ABE交于F点设PF=λFC则λ=
已知集合A={x|≤3}集合B={x|x2≤9}则A∩B=
现代社会“鼠标手”已成为常见病．一次实验中10名实验对象进行160分钟的连续鼠标点击游戏每位实验对象完成的游戏关卡一样鼠标点击频率平均为180次/分钟实验研究人员测试了实验对象使用鼠标前后的握力变化前臂表面肌电频率sEMG等指标． Ⅰ10名实验对象实验前后握力单位N测试结果如下 实验前346357358360362362364372373376 实验后313321322324330332334343350361 完成茎叶图并计算实验后握力平均值比实验前握力的平均值下降了多少N Ⅱ实验过程中测得时间t分与10名实验对象前臂表面肌电频率sEMG的中位数yHz的九组对应数据ty为087208440866079807810078120761407716075建立y关于时间t的线性回归方程 Ⅲ若肌肉肌电水平显著下降提示肌肉明显进入疲劳状态根据Ⅱ中9组数据分析使用鼠标多少分钟就该进行休息了 参考数据tiyi=-1800 参考公式回归方程=t+中斜率和截距的最小二乘估计公式分别为==．
执行如图程序框图所示的程序若输出的x的值为9则输入的x为
在△ABC中角ABC所对的边分别为abc若2sin2A+csinC-sinA=2sin2B且△ABC的面积S=abc．则角B=．
我市高三年级第二次质量检测的数学成绩X近似服从正态分布N82σ2且P74＜X＜82=0.42．已知我市某校有800人参加此次考试据此估计该校数学成绩不低于90分的人数为
某地种植常规稻α和杂交稻β常规稻α的亩产稳定为485公斤今年单价为3.70元/公斤估计明年单价不变的可能性为10%变为3.90元/公斤的可能性为70%变为4.00的可能性为20%．统计杂交稻β的亩产数据得到亩产的频率分布直方图如图①．统计近10年杂交稻β的单价单位元/公斤与种植亩数单位万亩的关系得到的10组数据记为xiyii=12..10并得到散点图如图②． 1根据以上数据估计明年常规稻α的单价平均值 2在频率分布直方图中各组的取值按中间值来计算求杂交稻β的亩产平均值以频率作为概率预计将来三年中至少有二年杂交稻β的亩产超过795公斤的概率 3①判断杂交稻β的单价y单位元/公斤与种植亩数x单位万亩是否线性相关若相关试根据以下的参考数据求出y关于x的线性回归方程 ②调查得知明年此地杂交稻β的种植亩数预计为2万亩．若在常规稻α和杂交稻β中选择明年种植哪种水稻收入更高 统计参考数据=1.60=2.82xiyi=-0.52xi2=0.65 附线性回归方程=bx+ab=．
假定你是李华你的朋友Mike要来中国学习想在就读的学校附近租房子.现在你已经为他找好了房子请你给他回一封email向他介绍该房子的情况. 内容包括 1.房子基本情况位置大小设施及租金等 2.房东要求. 注意1.词数100左右 2.可以适当增加细节以使行文连贯. DearMike Yours LiHua
已知球D的半径为3圆A与圆C为该球的两个小圆MN为圆A与圆C的公共弦MN=2若点B是弦MN的中点则四边形ABCD的面积的最大值为．
在复平面内复数z=a+bia∈Rb∈R对应向量O为坐标原点设||=r以射线Ox为始边OZ为终边旋转的角为θ则z=rcosθ+isinθ法国数学家棣莫弗发现棣莫弗定理z1=r1cosθ1+isinθ1z2=r2cosθ2+isinθ2则z1z2=r1r2[cosθ1+θ2+isinθ1+θ2]由棣莫弗定理导出了复数乘方公式[rcosθ+isinθ]n=rncosnθ+isinnθ则5=
ThefirstorganizedsystemforsendingmessagesbeganinEgyptaround1500B.C.ThissystemdevelopedbecausethepharaohsfrequentlyneededtosendmessagesupanddowntheNileRiverinordertokeeptheirempirerunningsmoothly.LaterthePersiansdevelopedamoreefficientsystemforsendingmessagesusingmenandhorses.MessagescarriersrodealongtheroadsystemstretchingfromoneendofthePersianEmpiretotheother.Alongtheseroadsfreshmenandhorseswaitedatspecialstationstotakeandpassalonganymessagesthatneededtobesent.Thestationswhereriderspassedmessagesbackandforthwerebuilt23kilometersapartsothemenandhorseswereabletotravelquicklybetweenthem.TheRomanslatertookuphisideaandimproveditbyusingamoreadvancedandextensiveroadsystem. InChinahoweverKublaiKhanhadbuiltuphisownsystemfordeliveringmessages.ThissystemworkedinthesamebasicwayastheRomansystem.ThedifferencewasthatKublaiKhankept300000horsesalongtheroadsofthisdeliverylines.Therewereover10000stationswhereamessagewouldbepassedfromoneridertoanotherwithafreshhorse.InthiswayKublaiKhancouldreceivemessagesfromanywhereinthecountryinonlyafewdays. Itwasnotuntilthe1500sthatawell-organizedpostalsystemappearedagaininEurope.OnefamilythevonTaxisfamilygainedtherighttodelivermailfortheHolyRomanEmpireandpartsofSpain.ThisfamilycontinuedtocarrymailbothgovernmentandprivatethroughoutEuropeforalmost300years. In1653aFrenchmanRenouarddeVelayerestablishedasystemfordeliveringpostinParis.PostalchargesatthattimewerepaidbytherecipientbutdeVelayer'ssystemwasuniquebyallowingthesendertopre-paythechargesinasimilarwaytothemodernstamp.UnfortunatelydeVelayer'ssystemcametoanendwhenjealouscompetitorsputlivemiceinhisletterboxesruininghisbusiness.Eventuallygovernment-controlledpostalsystemstookoverfromprivatepostalbusinessesandbythe1700sgovernmentownershipofmostpostalsystemsinEuropewasanacceptedfactoflife. Thethingthatalltheseearlysystemshadincommonwasthattheywerequiteexpensiveforpublicuseandwereintendedforusebythegovernmentandthewealthy.Howeverin1840aBritishschoolteachernamedRolandHillsuggestedintroducingpostagestampsandapostalratebasedonweight.ThisresultedinloweringpostalratesencouragingmorepeopletousethesystemtostayintouchwitheachotherHisideahelpedtheBritishpostalsystembegintoearnprofitsasearlyas1850.SoonafterthatmanyothercountriestookupMr.Hill'sidea.Andletterwritingbecameaccessibletoanyonewhocouldwrite.TodaytheRolandHillawardsaregiveneachyeartoencourageandrewardfreshideaswhichhelppromotephilatelystampcollecting. 1Whatisthemaintopicofthepassage? A.Howinternationalletterstravel. B.Asurprisingmethodfordeliveringmail. C.Thehistoryofpostalsystems. D.Changesinthemethodsofcommunication. 2WhichofthefollowingstatementsaboutRenouarddeVelayeristrue? A.Hiswasagovernment-controlledsystem. B.Hiscompetitorsdestroyedhisbusiness. C.Hissystemlastedforhundredsofyears. D.Inhissystemthepersonwhoreceivedtheletterpaidthepostagefees. 3Whichofthesystemsmentionedinthepassagewasmostlikethepostalsystemtoday? A.Egyptian. B.Chinese. C.deVelayer's. D.vonTaxis's. 4WhatwasRolandHill'sgreatestachievement? A.Hemadeletterwritingaccessibletotheaverageperson. B.HemadealotofmoneyfortheBritishpostalsystem. C.Hemadestampcollectingapopularhobby. D.Hewonanawardforletterwriting.
已知函数fx=2-xekx-1-xk∈Re为自然对数的底数 Ⅰ若fx在R上单调递减求k的最大值 Ⅱ当x∈12时证明ln＞2x-．
假设你是王平.上周你刚买了一台电视机但你发现电视机有问题请你用英文给商店经理写一封信反馈问题.内容包括 1.电视机的问题所在 2.你希望的解决方法及联系方式. 注意 1.词数80词左右 2.可适当增加细节以使行文连贯 3.信件开头和结束已经给出不计入总字数. DearSirorMadam Iboughta37-inchTVsetfor﹩400inyourstoreon15thofthismonth.AsalesgirlnamedMaryservedmeandrecommendedthisbrand. YoursSincerely WangPing
若二项式x6n的展开式中含有常数项则n的值可以是
Myfatherwasahighlyeducatedintelligentgentleman.Hecoulddebateordiscussfor1onalmostanytopicandholdyourattentionintheprocess.Ithoughttherewas2hewasn'tabletodo. Afewdays3myyoungerbrother's7thbirthdayDadplannedtoputtogetherashinynew4asaspecialbirthdaysurprise.Afternearlyanhourof5theinstructionsDadwasstillunabletoputthenewbiketogether.Laterhefoldedupthepaperofinstructions6histoolboxanddecidedtotakethebikebacktothelocaltoystoreandpayextramoneytohaveit7assembled组装there.Thenan8cametohimashecalledouttoLovettthequietlittlemanwhomowedourgrassland. Lovetthaveyoueverassembledaboy'sbicycle?AsLovettwalkedtowardsthebikeDadhandedhimthepaperofinstructions.Lovetthandedit9tohimsayingNothanks.Ican'tread.Whenyoucan'treadyouhaveto10.Lessthan15minuteslaterthenewbicyclewasfullyassembledwithnospareparts11.DadshookLovett'shandpattedhimonthebackthankedhimandhidthebike. Onthenightaftermybrother12hisslm1ynewgift.Dadannouncedatthefamilydinnertable13hadhappenedseveraldaysearlier.Hetookgreatdelightintellingit14---heuseditasanexampleofthinking. Hedidnot15illiteracy文盲butstronglytaughtustouseour16.Thejokewasonmyfather17hewasabletotumitintoalearningtoolandIlikedhimeven18aftertheincident.IalsogainedarespectforLovett.Tomehehadalwaysbeentheoldyardmanwhodidn'tsaymuchbutafterthatdayheseemedtosmile19evenwalktaller.It'samazingwhatarealnodof20candotoliftpeopleup. 1A.minutes B.seconds C.hours D.years 2A.nothing B.everything C.something D.onething 3A.after B.ago C.before D.during 4A.toy B.car C.vehicle D.bike 5A.writing B.reading C.hearing D.explaining 6A.tookup B.pickedup C.heldup D.gaveup 7A.simply B.deliberately C.evidently D.correctly 8A.plot B.scene C.idea D.story 9A.back B.in C.out D.down 10A.quit B.stop C.argue D.think 11A.remaining B.remained C.spotted D.losing 12A.designed B.bought C.decorated D.received 13A.what B.that C.which D.why 14A.onceinawhile B.innotime C.fromthenon D.againandagain 15A.referto B.applyto C.relyon D.spyon 16A.hands B.heads C.mouths D.feet 17A.or B.and C.but D.because 18A.less B.worse C.more D.much 19A.larger B.happier C.luckier D.broader 20A.approval B.achievement C.judgment D.comfort
设集合A={x∈Z|x2≤1}B={-1012}则A∩B=
已知四面体ABCD中平面ABD⊥平面BCD△ABD为边长2的等边三角形BD=DCBD⊥CD则异面直线AC与BD所成角的余弦值为
已知等差数列{an}的前n项和为Sn且S4=24a8=17则S8=．
已知函数fx=x+过点10作曲线fx的两条切线切点为Ax1fx1Bx2fx2其中0＜x1＜x2．若在区间x1x2中存在唯一整数则a的取值范围是
Howtopersuadepeople Convincingpeoplethatyourwayisthebestwayisoftenverydifficult-especiallywhenyou'renotquitesurewhythey'resayingno.Thetrickistogetthemwonderingwhythey'resayingno.1. —Understandhowtimingiseverything.Knowinghowtopersuadepeopleisn'tjustinwordsandbodylanguage-it'salsoinknowingtherighttimetotalktothem.2youwillmostlikelyachievefasterbetterresults. —Gettoknowthem.Alargepartofwhetherornotpersuasioniseffectiveisbasedonthegeneralrelationshipbetweenyouandyourclient/son/friend/employee.Ifyoudon'tknowthepersonwellit'svitaltostartbuildingthisrelationshipimmediately-findcommongroundassoonaspossible.Humansingeneralaremorefondofpeoplethataresimilartothem.3. —4.Peoplearemorepersuadedbyafastconfidenttalkerthanaccuracy.Thefasteryoutalkthelesstimeyourlistenerhastoprocesswhatyou'vesaidandquestionit.Youmaycreatethefeelingthatyoutrulygraspthesubjectbyrunningthroughthefactsatwarpspeedconfidentofthemall. —Createurgency.Inordertogetpeopletoactinthemomentyouhavetobeabletocreateasenseofurgency.5it'sunlikelythey'llchangetheirmindsinthefuture.Youmustpersuadepeopleinthepresentit'sallthatmatters. A.Talkfast B.Communicatewithothers C.Ifsomeoneisawareofthis D.Andwiththerighttricksyoucandoit E.Sofindparallelsandmakethemknown F.Ifthey'renotmotivatedenoughtowantwhateveryouhaverightnow G.Ifyouapproachpeoplewhentheyaremorerelaxedandopentodiscussion
Withthe1inventofpersonalcomputerstheInternetandcellphonespeoplenowhavemoreimmediateaccesstoothersandinformation2anytimeinhistory.Losingthataccesscanleadtodisconnectanxiety''3isapsychologicaltermusedtodescribethe4anxietyfeelingsthatpeopleexperiencewhentheyareunable5usetheircellphonesorcannotlogontotheInternet.Somepeople6affectbydisconnectanxietymaystarttofeelupsetwhen7cannotreachtheirfriendsonline.Othersgetreallyworriedwhentheyarenotabletorespondtoemergenciesandthismakesthemfeel8help.Stillothersaresodependentontheircellphonesthattheyarefrightenedofmissinganyphonecalls.CellphonesandtheInternet9becomethemostimportanttechnologicaltoolstothesepeoplewhocannotaffordtolive10thesethings.
椭圆+y2=1上存在两点AB关于直线4x-2y-3=0对称若O为坐标原点则||=
如图在以P为顶点母线长为的圆锥中底面圆O的直径AB长为2C是圆O所在平面内一点且AC是圆O的切线连接BC交圆O于点D连接PDPC． 1求证平面PAC⊥平面PBC 2若E是PC的中点连接OEED当二面角B-PO-D的大小为120°时求平面PAC与平面DOE所成锐二面角的余弦值．
在平面直角坐标系xOy中曲线C的参数方程为α为参数直线l的参数方程为t为参数0≤β＜π以坐标原点O为极点x轴的非负半轴为极轴建立极坐标系． 1求曲线C的极坐标方程 2已知直线l与曲线C相交于AB两点且|OA|-|OB|=2求β．
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