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函数y＝2|x|﹣x2（x∈R）的图象为（ ）
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高三上学期数学《》真题及答案
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根据下列要求解答相关问题.1请补全以下求不等式﹣2x2﹣4x＞0的解集的过程.①构造函数画出图象根据
把函数y=fxx∈R的图象上所有点向右平行移动个单位长度再把所得图象上所有点的横坐标伸长到原来的2倍
y=sin（2x﹣
），x∈R
y=sin（
），x∈R
y=sin（2x
），x∈R
y=sin（2x
），x∈R
将函数y=﹣2x的图象向下平移3个单位所得图象对应的函数关系式为
y=﹣2（x+3）
y=﹣2（x﹣3）
y=﹣2x+3
y=﹣2x﹣3
正比例函数y=2x的图象沿x轴向右平移2个单位所得图象的函数解析式为
y=2x﹣2
y=2x+2
y=2x﹣4
y=2x+4
将函数y=﹣2x的图象沿y轴向下平移3个单位长度后所得图象函数关系式为
y=﹣2（x-3）
y=﹣2x﹣3
y=﹣2（x+3）
y=﹣2x+3
把函数y=﹣2x+3的图象向下平移4个单位后的函数图象的解析式为
y=﹣2x+7
y=﹣6x+3
y=﹣2x﹣1
y=﹣2x﹣5
已知向量a=mcos2xb=sin2xn设函数fx=a·b且y=fx的图象过点和点.1求实数mn的值
在平面直角坐标系中已知一次函数y=﹣2x+1的图象经过P.1x1y1P.2x2y2两点若x1＜x2则
若把一次函数y=2x﹣3的图象向上平移3个单位长度得到图象对应的函数解析式为
y=2x
y=2x﹣6
y=4x﹣3
y=﹣x﹣3
根据下列要求解答相关问题.1请补全以下求不等式﹣2x2﹣4x＞0的解集的过程.①构造函数画出图象根据
下列判断中唯一正确的是
函数y=ax
2
的图象开口向上,函数y=－ax
2
的图象开口向下
二次函数y=ax
2
,当x<0时,y随x的增大而增大
y=2x
2
与y=-2x
2
图象的顶点、对称轴、开口方向、开口大小完全相同
抛物线y=ax
2
与y= －ax
2
的图象关于x轴对称
一次函数y=kx+b的图象与正比例函数y=2x的图象平行且经过点
（1,-2），则一次函数的解析式为（ ） A.y=2x+4
y=2x-4
y=-2x+4
y=-2x-4
关于二次函数y=x2﹣2x﹣3的图象下列说法中错误的是
当x＜2，y随x的增大而减小
函数的对称轴是直线x=1
函数的开口方向向上
函数图象与y轴的交点坐标是（0，﹣3）
定义在R.上的函数y=fx为减函数且函数y=fx﹣1的图象关于点10对称若fx2﹣2x+f2b﹣b2
[﹣2，0]
[﹣2，2]
[0，2]
[0，4]
已知下列函数①y=x2②y=﹣x2③y=x﹣12+2.其中图象通过平移可以得到函数y=x2+2x﹣3
将函数y＝sin2x＋cos2x的图象向左平移个单位长度所得图象对应的函数解析式可以是.
y＝cos 2x＋sin 2x
y＝cos 2x－sin 2x
y＝sin 2x－cos 2x
y＝sin xcos x
已知fx＝sin＋x∈R..1求函数fx的最小正周期和单调增区间.2函数fx的图象可以由函数y＝si
把函数y=﹣2x+3的图象向左平移2个单位长度再向下平移2个单位长度可得到的图象的函数解析式是
y=﹣2x+7
y=﹣2x﹣7
y=﹣2x﹣3
y=﹣2x
给出以下命题:①函数fx=|log2x2|既无最大值也无最小值;②函数fx=|x2-2x-3|的图象
若函数y＝fxx∈R满足fx＋2＝fx且x∈[－11时fx＝|x|.则函数y＝fx的图象与函数y＝l
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能够说明“在某个区间ab内如果函数y＝fx在这个区间内单调递增那么f'x＞0恒成立”是假命题的一个函数是．写出函数表达式和区间
You'vegotyourfancynewsuitcaseandyou'rereadytotakeitwithyouonyourtravelsacrosstheglobe. Yougettotheairportquicklymovingthroughthecrowdsontheunevenpavementrushingtocheckin.Thenyourheartsinkswhenyourealizeyournewsuitcasehasgotaseriouscaseofthewobbles摇晃. Whydoesthishappen? ScientistsfromtheUniversiteParis﹣DiderotinFranceinvestigatedthismatterandpublishedtheirfindingsinthesciencejournalProceedingsoftheRoyalSocietyA.Theyalsosuggestedsomesolutionstoovercomethismodern﹣dayproblem. Tolearnmoreabouttheissuetheyputasuitcaseonatreadmill跑步机andobservedwhathappened. Itwassoonnotedthatthewobblewasactuallyaresultofrepeatedactionsthatcausedthesuitcasetoswayfromsidetoside.Theydiscoveredthatifoneofthewheelsencounteredanobstaclesuchasasmallbumpitjumpedintotheairforjustamomentandthenbangedbackdowntotheground.Thatsecondactioncausedtheoppositewheeltoliftoffthegroundandthentobangbackdowncausingthefirsttoliftagainandsoon.Thisswayingincreasedastheluggagewaspulledalong. Thesuitcaseisafunwaytotackletheproblembutthestudywouldbethesameforanytrolleywithtwowheelsorblades桨叶SylvainCourrechduPontleadauthorofthestudytoldBBCNews.Soitwillbethesameforacaravan大篷车ormaybealsoforairplanes. Insteadofslowingdownwhenweseearockypartofthepaththescientistsrecommendeddoingtheexactoppositeandspeedingup.Thisisbecausegoingfastergivesthewheelslesstimetoriseandfallpreventingthecasefromswaying.Theyalsosaidthatreducingtheangleofthesuitcasebyloweringitshandletothegroundwouldhelpkeepitsteady. ThesefindingscouldhelpresearcherssimulateanddesignbetterrollingsuitcasesandotherpulledtrolleyssuchastowedtrailersCourrechduPontadded. Withthesemasterminds智者workingonperfectingoursuitcaseproblemswobblyluggagemaysoonbeathingofhistoryleavingustoenjoyourtravels. 1Themainpurposeofthefirsttwoparagraphsisto. A.showtheimportanceofagoodwheeledsuitcasefortravel B.leaduptothewobblingproblemofwheeledsuitcases C.describehowunstablewheeledsuitcasescanbe D.showthatwobblingcancausewheeledsuitcasestostopworking 2Accordingtothescientistswhenasuitcasemeetswithanobstacle. A.theswayingwillstopforamoment B.itstwowheelswilljumpintotheairatthesametime C.evenasmallobstaclecanleadtoaseriousdamage D.thereisaseriesofrepeatedactionsleadingtotheswaying 3Whatcanbedonetokeepasuitcasesteadyonanunevenpathaccordingtothetext? A.Slowdown. B.Pullthesuitcaseatafasterspeed. C.Raisethehandleofthesuitcase. D.Increasetheangleofthesuitcase. 4Accordingtothearticlethefindingscould. A.helpimprovethedesignofsuitcases B.solvethewobbleofsuitcasescompletely C.behelpfulintheadvancementoftreadmills D.beusedtodevelopbladesforboats
a＝2b＝3c＝5则abc的大小关系为
为调查某公司五类机器的销售情况该公司随机收集了一个月销售的有关数据公司规定同一类机器销售价格相同经分类整理得到下表 利润率是指一台机器销售价格减去出厂价格得到的利润与该机器销售价格的比值． Ⅰ从该公司本月卖出的机器中随机选一台求这台机器利润率高于0.2的概率 Ⅱ从该公司本月卖出的销售单价为20万元的机器中随机选取2台求这两台机器的利润率不同的概率 Ⅲ假设每类机器利润率不变销售一台第一类机器获利x1万元销售一台第二类机器获利x2万元…销售一台第五类机器获利x5依据上表统计数据随机销售一台机器获利的期望为Ex设＝试判断Ex与的大小．结论不要求证明
WilliamButlerYeatsamostfamousIrishwriterwasborninDublinonJune131865.Hischildhood1theharmonythatwas2ofahappyfamily.LaterYeatsshockedhisfamilybysayingthatherememberedlittleofchildhoodbutitspain.Infacthe3excellenttasteinartfromhisfamily﹣bothhisfatherandhisbrotherwerepainters.Buthefinally4literature5dramaandpoetry. Yeatshadstrong6inthecomingofnewartisticmovements.Hesethimselfthe7taskinfoundinganIrishnationaltheatreinthelate1890s.Hisearlytheatricalexperiments8werenotreceived9atthebeginning.Hedidn'tloseheartandfinallyenjoyed10inhispoeticaldrama. 11withhisdramaticworksYeats'spoemsattractmuch12notice.Thesubjectmatterincludeslovenaturehistorytimeandaging.ThoughYeatsgenerallyreliedonverytraditionalformshebroughtmodern13tothem.Ashisliterarylife14hispoetrygrewfinerandricherwhichledhimtoworldwide15. Hehadnot16amajorpubliclife17winningtheNobelPrizein1923.Yethecontinuedwritingalmosttotheendofhislife.HadYeatsstoppedwritingatage40hewouldprobablynowbe18asaminorpoetforthereisnootherexampleinliteraryhistoryofapoetwho19hisgreatestworksbetweentheagesof50and75.AfterYeats'sdeathin1939W.H.Audenwroteamongothersthefollowinglines Earthreceivean20guest WilliamYeatsislaidtorest. LettheIrishvessel船lie. Emptiedofitspoetry. 1A.held B.lacked C.expected D.desired 2A.typical B.special C.awkward D.capable 3A.inherited B.developed C.abandoned D.formed 4A.carriedon B.decidedon C.puton D.basedon 5A.regularly B.instantly C.particularly D.finally 6A.desire B.energy C.access D.faith 7A.fresh B.stupid C.small D.difficult 8A.therefore B.however C.besides D.furthermore 9A.possibly B.honorably C.favorably D.doubtfully 10A.failure B.fame C.pleasure D.success 11A.Connected B.Occupied C.Compared D.Tired 12A.admiring B.amusing C.amazing D.envying 13A.potential B.sensibility C.possibility D.benefit 14A.finished B.produced C.created D.progressed 15A.praise B.spread C.recognition D.assessment 16A.enjoyed B.accepted C.purchased D.taken 17A.before B.since C.until D.after 18A.respected B.admired C.valued D.favored 19A.prohibits B.attempts C.recommends D.produces 20A.appealed B.advocated C.advanced D.honored
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某几何体的三视图如图则它的外接球的表面积为
SeveralweeksagoourheadmasterMr.GauditoldusthatourschoolhadbeenchosentocompeteonSmartAleck﹣agameshowwhichmybestfriendCarlaandIbothlove.Carlahasagoodimagination1Iknowalotofhistory.Sowethoughtwe'dbegood2fortheteam. AfewdayslaterMr.Gaudiheldameetingwitheveryoneinterestedinthe3.HetoldusthatSmartAleckusesafivememberteam.Healsosaidthatthreemorepeoplewouldbeneededasbackup替补.4fourtimesthatmanystudentswereatthemeeting.SoMr.Gaudisaidwewouldhavea5amongallthestudentspresentandthetop6scorerswouldbecometheteamandthebackup.Everybodyagreedthatthiswasa7waytodecide. Yesterdayallofthehopefulswenttothedininghallafterschool.Wewouldhaveto8thestartingline﹣up阵容.Mr.Gaudiactedasthe9.Afteracoupleofhoursallthe10ontheteamweresetexceptone.CarlaandI11forthatlastposition.Wehadtoholdaone﹣on﹣onecompetition12thetwoofus.Thewinnerwouldbeontheteamandtheloserwouldbethe13. Midwaythroughourtwo﹣personcompetitionIwasstartingtopullahead.14IsawthelookonCarla'sface.IwaitedforasecondandknewwhatIhadtodo.AsmuchasIwantedtobeonSmartAleckCarlawanted15evenmore.SostartingwithmynextquestionIheldbackandletCarla16justbyalittlebit.Herexpressionasshe17shewouldbeontheshowmadeupformynotbeingontheteam.AndsinceIwillgoasbackupI'llstillhavethe18ofseeingtheshowupclose. WasI19bynottryingashardasIcould?Idon'tthinkso.NoonenoticedandCarlaandIdidn't20it.Itwon'thurttheteambecauseCarlawillbeaverygoodcompetitorontherealshow.Ithinkthatmakingmybestfriendhappywastherightthingtodo. 1A.but B.or C.so D.and 2A.pairs B.choices C.leaders D.fans 3A.course B.work C.play D.show 4A.Luckily B.Unluckily C.Importantly D.Hopefully 5A.direction B.discussion C.competition D.conversation 6A.five B.three C.two D.eight 7A.special B.hard C.funny D.fair 8A.decide B.draw C.push D.make 9A.headmaster B.coach C.host D.headteacher 10A.places B.rules C.names D.orders 11A.tied B.clapped C.cried D.returned 12A.of B.on C.between D.among 13A.backup B.audience C.cheerleader D.member 14A.Still B.Never C.Then D.Again 15A.us B.it C.me D.her 16A.wait B.turn C.move D.win 17A.accepted B.realized C.considered D.refused 18A.laughter B.sadness C.fun D.change 19A.coming B.refusing C.helping D.cheating 20A.mean B.plan C.regret D.say
函数y＝3sinx+4cosxx∈R的值域是
在△ABC中角ABC的对边分别为abca＝3． Ⅰ求c的值 Ⅱ若D为BC边上的点并且求∠ADB．
假如你是李华你的英国笔友Peter来信说近期要来北京希望你为他设计一个旅行计划推荐一些有中国特色的活动.请根据以下提示写一封回信.内容要点 TravelPlan 注意1.开头语和结束语已经为你写好不计入总词数2.可适当增加细节以使行文连贯 3.文中不能出现考生真实个人信息 4.词数100左右. DearPeter I'mhappytohearyou'recomingtoBeijing. Lookingforwardtomeetingyousoon! Yours LiHua
执行如图所示的程序框图输出的s值为
如果存在常数a使得数列{an}满足若x是数列{an}中的一项则a﹣x也是数列{an}中的一项称数列{an}为“兑换数列”常数a是它的“兑换系数”． 1若数列236mm＞6是“兑换系数”为a的“兑换数列”求m和a的值 2已知有穷等差数列{bn}的项数是n0n0≥3所有项之和是B求证数列{bn}是“兑换数列”并用n0和B表示它的“兑换系数” 3对于一个不少于3项且各项皆为正整数的递增数列{cn}是否有可能它既是等比数列又是“兑换数列”给出你的结论并说明理由．
某地拟建造一座体育馆其设计方案侧面的外轮廓线如图所示曲线AB是以点E为圆心的圆的一部分其中E0t0＜t≤25GF是圆的切线且GF⊥AD曲线BC是抛物线y＝﹣ax2+50a＞0的一部分CD⊥AD且CD恰好等于圆E的半径． 1若CD＝30米米求t与a的值 2若体育馆侧面的最大宽度DF不超过75米求a的取值范围．
不等式kx≥x＞0恒成立则k的最小值为
曲线C的极坐标方程为Cρ2＝直线的参数方程为t为参数 1写出C的直角坐标方程与l的普通方程 2直线l与曲线C相交于两点AB设点M0﹣1求的值．
1WhenyoutakeReadingintheDigitalAgeyouwill. A.walkintodifferentpeople'slife B.learnwaysofunderstandingtexts C.getbetteratcomputerskills D.shareopinionswithliteraryscholars 2WhowillhelpstudentsbetterunderstandthethemesofShakespeare'splays? A.Actors. B.Scholars. C.Historians. D.Videotutors. 3WhatcanpeoplelearnfromTheEuropeanDiscoveryofChina? A.China'sdiscoveryoftheWest. B.TheriseandfalloftheQingDynasty. C.TheimportanceoftheSilkRoad. D.China'sinterestinWesterntravellers. 4Whatarethesubjectsoftheseonlinecourses? A.Scienceandhistory. B.Mediaandhealth. C.Natureandenvironment. D.Languageandculture. 5Inwhichwaydothethreecourseshaveincommon? A.Theyareaimedatstudents. B.Theyareprovidedforfree. C.Eachlasts6weeks. D.Eachtakes2hoursperweek.
已知椭圆Ma＞b＞0的长轴长为6且经过点过点P并且倾斜角互补的两条直线l1l2与椭圆M的交点分别为BC点B在点C的左侧点E﹣70．Ⅰ求椭圆M的方程Ⅱ求证四边形PEBC为梯形．
过点M20的直线l与抛物线Cy2＝2pxp＞0交于AB两点O为坐标原点OA⊥OB．1求p的值2若l与坐标轴不平行且A关于x轴的对称点为D求证直线BD恒过定点．
设{an}是等比数列且a2a4＝a5a4＝27则{an}的通项公式为．
WhenHuangLizhitookherfirstclassinAfricansociologyattheUniversityoftheWitwatersrandinSouthAfricainFebruaryherprofessoraskedherandherclassmateswhatimpressesthemmostwhenitcomestoAfrica. UnexpectedlyHuang31foundthatwordslikepovertyandsafari﹣negativewordsthatwereoftenassociatedwiththecontinentinmediareports﹣werethekindoftermsherAfricanclassmatesdidn'twanttohear.InsteadtheypreferredtohearthequestionansweredinthiswayAfricaisthecradleofhumankindandAfricansarepassionateandgenerous. Apparentlytherearesomemisunderstandingsbetweenus.It'struethatwithincidentsliketheEbolaoutbreakinWesternAfricaandtheemergence出现ofpiratesoffthecoastofSomaliahittingthenewsit'seasyforustokeepforgettingthatAfricahasoneoftheworld'soldestcivilizations﹣Egyptbornbytheworld'slongestrivertheNile.TheproofisintheGreatPyramidofGizaandtheGreatSphinxofGizawhicharebothpopularamongtourists.AndthetombsofancientEgypthavealsobecomeendlesssourcesfortheliteratureandfilmindustries. WhenitcomestothenaturalenvironmentofAfricaourmisunderstandingsareonlybigger.Butthetruthisthatinsteadofbeingextremelyhotallyearandcoveredbydesertthecontinenthaslargeareasofsavannas稀树草原wherelionsgiraffesandzebraslivethesnowcappedKilimanjaro﹣thehighestmountaininAfrica﹣andeventhickforestontheislandofMadagascar.Thesemisunderstandingsareoneofthereasonswhythe2018BeijingSummitoftheForumonChina﹣AfricaCooperationwasheldonSept3and4﹣tounderstandeachotherbetter. IndeedonlybyvisitingAfricaherselfdidHuangseetheconvenientlivingconditionstheamazingnaturalbeautyandthefriendlypeople.InhereyesherclassmateswereashopefulaboutthefutureoftheirowncountriesastheywereaboutAfricaasawholeandtheywerequicktodemonstrateboththeirstrongwillandactivity.AtthatmomentIknewexactlywhattheywanted﹣theywantedtheirculturetoberespected. 1Whichofthefollowingbestexplainscradleunderlinedinparagraph2? A.Asmallbedforbabies. B.Abaskettoholdsomething. C.Aplaceforpeopletorelaxthemselves. D.Aplacewheresomethingimportantbegan. 2WhatcanweinferaboutAfricaaccordingtothepassage? A.Itisveryhotalltheyearround. B.It'snotasafecontinenttolivein C.It'sdifferentfromwhatweimagine. D.Itisboundtohaveabrightfuture 3WhichofthefollowingwouldHuangagreewith? A.Toseeistobelieve B.Thinktwicebeforeyoudo C.Amissisasgoodasamile D.Don'tjudgeapersonbyhisappearance 4Whatcanbeasuitabletitleforthetext? A.ValuingaCulture. B.UnderstandingAfrica. C.PayingaVisittoAfrica. D.DiscoveringaContinent.
PM2.5是衡量空气污染程度的一个指标为了了解A市空气质量情况从2018年每天的PM2.5值的数据中随机抽取40天的数据其频率分布直方图如图所示．将PM2.5值划分成区间[0100[100150[150200[200250]分别称为一级二级三级和四级统计时用频率估计概率． 1根据2018年的数据估计该市在2019年中空气质量为一级的天数 2按照分层抽样的方法从样本二级三级四级中抽取6天的PM2.5数据再从这6个数据中随机抽取2个求仅有二级天气的概率．
关于函数fx＝|x﹣1|﹣1的下列结论错误的是
直线2x+y﹣3＝0与圆x2+y2﹣2x﹣2y＝0相交于AB两点O为坐标原点则．
在平面直角坐标系中记曲线C为点P2cosθ﹣12sinθ+1的轨迹直线x﹣ty+2＝0与曲线C交于AB两点则|AB|的最小值为
已知i是虚数单位复数＝
已知函数y＝sinωxω＞0在0上有最大值没有最小值则ω的取值范围为．
已知集合P＝{012}Q＝{x|x＜2}则P∩Q＝
若不等式组可表示为由直线围成的三角形区域包括边界则实数a的范围是
过椭圆C+＝1a＞b＞0的左焦点F的直线过C的上端点B且与椭圆相交于另一个点A若|BF|＝3|AF|则C的离心率为．
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），x∈R y=sin（
），x∈R y=sin（2x
），x∈R y=sin（2x
），x∈R
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