首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
已知a>﹣1,b>0,a+2b=1,则的最小值为( )
查看本题答案
包含此试题的试卷
高一下学期数学《》真题及答案
点击查看
你可能感兴趣的试题
已知fx=x+-2x〉0则fx有
最大值为0
最小值为0
最大值为-4
最小值为-4
已知x>1函数的最小值为___________
已知函数fx=-sin2x-asinx+b+1的最大值为0最小值为-4若实数a>0求ab的值.
已知fx=3-2|x|gx=x2-2xF.x=则F.x的最值是
最大值为3,最小值-1
最大值为7-2
,无最小值
最大值为3,无最小值
既无最大值,又无最小值
已知点mn在直线5x+2y-20=0上其中m>0n>0则lgm+lgn
有最大值为2
有最小值为2
有最大值为1
有最小值为1
已知函数fx=x2+2ax+3在-∞1]上单调递减当x∈[a+11]时fx的最大值与最小值之差为ga
已知函数定义如下当
有最大值1,无最小值
有最小值0,无最大值
有最小值—1,无最大值
无最小值,也无最大值
已知fx=3-2|x|gx=x2-2xF.x=则F.x的最值情况为
最大值为3,最小值为-1
最大值为7-2
,无最小值
最大值为3,无最小值
既无最大值,又无最小值
已知M.10N.-10点P.为直线2x-y-1=0上的动点求PM2+PN2的最小值及取最小值时点P.
已知ω>0函数fx=cosωx+的一条对称轴为x=一个对称中心为点0则ω有
最小值2
最大值2
最小值1
最大值1
已知直线a2x+y+2=0与直线bx-a2+1y-1=0互相垂直则|ab|的最小值为________
已知函数fx=-x2+4x+ax∈[01]若fx有最小值-2则fx的最大值为
-1
0
1
2
已知函数fx=|2x﹣1|.Ⅰ求不等式fx<2的解集Ⅱ若函数gx=fx+fx﹣1的最小值为a且m+n
已知二次函数y=ax2+bx的图像经过点
(-1,1),则ab有( ) A.最大值1
最大值2
最小值0
最小值-
已知函数fx=-x2+4x+ax∈[01]若fx的最小值为-2则fx的最大值为
-1
0
1
2
已知fx=x+-2x
最大值为0
最小值为0
最大值为-4
最小值为-4
已知二次函数y=ax2+bx+ca<0的图象如图222当-5≤x≤0时下列说法正确的是
有最小值-5、最大值0
有最小值-3、最大值6
有最小值0、最大值6
有最小值2、最大值6
已知函数fx=x2-2x+4在区间[0m]m>0上的最大值为4最小值为3则实数m的取值范围是
[1,2]
(0,1]
(0,2]
[1,+∞)
已知fx是二次函数若fx的最小值为2且f0=f2=3.1求函数fx的解析式2求fx在区间[tt+1]
已知二次函数y=-x2-2x.关于该函数在-3≤x≤0范围内下列说法正确的是
有最大值1,无最小值
有最大值1,有最小值0
有最大值1,有最小值-3
有最大值0,有最小值-3
热门试题
更多
In1traditionChineseculturetaichiisoftenrelatedtotheChineseideaofyinandyangtheideathatonecanseetwosidesineverything.Once2atimeTaoistZhangSanfengsawabirdattackingasnakeintheWudangMountainsinHubeiprovince.Thesnake'sdefenseinspiredhim3createasetof72movementswhichused4softandpowerfrominsidetodefeatviolentforce. Forthosepeople5doittaichicanbepracticedanytimeandanywherewithoutequipmentoragymnasium.Andlearningtodoit6correctgivesusapracticalwaytoachievesuchthingsasbalancemotorcontrolandrhythm节奏ofmovement.Soit7believethatpracticingtaichicaninsomewayhelpusstandwalkmoveandrunbetter. Taichi'sbenefitscertainlygobeyondphysicalones.ForMarleniCalcinafromPeruwho8dotaichiforover10yearsit'snotonlyasportbutalsoawayoflife.And9istaichithathashelpedherunderstandthevalueofgoingslowly.Nowpracticingtaichiislike10speakwithhersoul.
Ifyouarehavingtroublefallingasleepyouarenotalone.About65%ofAmericanssaidtheyhavesleepingproblemsafewnightseachweekaccordingtoarecentstudybytheNationalSleepFoundation.Sleepingtoolittlecanleadtoahigherriskofbecomingfatandgettingdepressed沮丧的.Butbeforeyougotoadoctorforadviceitisworthexaminingyoursleepinghabitsonemoretime.Someofyourfavoriteeveninghabitsmayhavesomethingtodowiththesleepingproblems. SettingaBrightAlarmClock Thelightofyourbrightalarmclockcanpreventyoufromfallingasleep.Youcanmakeyourroomasdarkaspossible.Coverthebrightnumberswithabookorconsiderbuyingasmalltravelclock.Yourcellphonealarmmayalsodothetrick. CountingSheep Whenyoujustcan'tfallasleepit'suselesstostayinbedtocountsheep.Ifyou'vebeentryingtofallasleepformorethan30minutestheNationalSleepFoundationsuggestsyougetuptodosomereadingorwatchTVforawhile.Suchactivitieswillmakeyousleepy.Beforeyouknowityou'llbegoingbacktobedreallytired. ExercisingLateatNight Daytimeworkouts锻炼willkeepyoufullofenergyforhours.That'swhyyoudon'twanttoexercisewithinthreehoursofhittingthesack.Fierce剧烈的physicalactivityraisesyourbodytemperatureandpumpsyourenergylevel﹣botharebadforagoodnight'ssleep. 1Whatcanwelearnfromthefirstsentenceofthepassage? A.It'snotgoodtofailtofallasleepatnight. B.Peopleinagoodcompanyoftenhavesleepingproblems. C.Therearemanypeoplewhohavesleepingproblems. D.Youshouldfindsomeonetotalktoifyoucan'tfallasleep. 2Theunderlinedparthittingthesackinthelastparagraphmeans. A.goingbackhome B.goingtobed C.goingtothegym健身馆 D.fallingasleep 3Bywritingthepasagethewritermainlywantstotellus. A.whysomanypeoplecan'tsleepwellatnight B.howtoenjoyagoodnight'ssleep C.thatsleepingproblemsaretroublingmoreandmorepeople D.thatpeoplemaysolvetheirsleepingproblemsbysomehabits
如图已知点F是△ABC的重心连接BF并延长交AC于点E连接CF并延长交AB于点D过点F作FG∥BC交AC于点G.设三角形EFG四边形FBCG的面积分别为S1S2则S1S2=.
位于湖南省西北部距离湖南省会长沙约300公里占地面积9563平方千米的张家界是一座因独特的自然景色和丰富的旅游资源而闻名的旅游城市.
Mostdogownersfeelthattheirdogsaretheirbestfriends.Almosteveryonelikesdogsbecausetheytryhardtopleasetheirowners.Oneofmyfavoritestoriesisaboutadogwhowantedtheownertopleasehim.OneofmyfriendshasalargeGermanshepherd牧羊犬namedJack.Thesedogsareoftenveryintelligentclever.EverySundayafternoonmyfriendtakesJackforawalkinthepark.Jacklikestheselongwalksverymuch. OneSundayafternoonayoungmancametovisitmyfriend.Hestayedalongtimeandhetalkedandtalked.SoonitwastimeformyfriendtotakeJackforhiswalkbutthevisitordidn'tleave.Jackbecameveryworriedabouthiswalkinthepark.Hewalkedaroundtheroomseveraltimesandthensatdowndirectlyinfrontofthevisitorandlookedathim.Butthevisitorpaidnoattention.Hecontinuedtalking.FinallyJakcouldn'tstanditanylonger.Hewentoutoftheroomandcamebackafewminuteslater.Hesatdownagaininfrontofthevisitorbutthistimeheheldtheman'shatinhismouth. Germanshepherdsaren'ttheonlyintelligentdogs.AnotherintelligentdogisaSeeingEyedog.Thisisaspecialdogthathelpsblindpeoplewalkalongthestreetsanddomanyotherthings.WecallthesedogsSeeingEyedogsbecausetheyaretheeyesoftheblindpeopleandtheyhelpthemtosee.SeeingEyedogsgenerallygotospecialschoolsforseveralyearstolearntohelpblindpeople. 1Jackcametositinfrontofthevisitorinorderto. A.pleasehim B.bepleased C.askhimtoleaveimmediately D.invitehimforawalk 2WhatdoesitinthesentenceJackcouldn'tstanditanylongerreferto? A.hiswalkingaroundtheroomseveraltimes B.hissittinginfrontofthevisitor C.hisowner'svisitor'ssayingandtalking D.hiswalkinginthepark 3SeeingEyedogs. A.aremoreintelligentthanGermanshepherds B.haveonlyoneeye C.helpblindpeoplegotospecialschools D.helpandseeforblindpeople 4WhichofthefollowingstatementsisRIGHT? A.Mostdogsareveryintelligent. B.ItusuallytakesseveralyearsforSeeingEyedogstolearntohlpblindpeople. C.Germanshepherdsarethemostintelligentdogsintheworld. D.SeeingEyedogscanonlyhelpblindpeoplewalkalongthestreets.
Maryhadfearedthedayshewoulddrawablankduringapresentation.Thenonedayduringa45﹣minutespeechithappened.1.TohelpherselfgetbackontrackMaryaskedtheaudiencetolookatthehandoutandtellherwhattopicwasupnext.Attheendofherpresentationaudiencemembersgavehertopmarksfororganization. WhatIlearnedisthattheaudiencedoesn'tcareifyoumessupandwhattheycareaboutiswhatyouaregoingtodoaboutitMarysaid.MynervousnesswentawaywhenIconcentratednotonmyselfbutinsteadjustthought‘Howismyspeechgoingtohelptheaudience?'2.Everysinglestepofthewayaskyourself‘What'sinitforthem?' ●3. CarteristhefounderofCanada﹣basedpresentationskillstrainingcompany.Whenpossiblehegetstothelocationofhispresentationthedaybeforetomakesurealltheelectronicaidswork.Hewantstoensurethescreenlightingandinputsallworkproperly.Inadditionbuildanextraplanbeforeyoupresent.hesaid. ●Involvetheaudience Whetheryouaregivingaone﹣on﹣onetalkoraspeechinfrontof400peoplethinkstory﹣telling.4.Thewaytoaperson'sheadisthroughhisheart.Sometimesallittakesisafewsecondstoconnectanaudiencememberwithastory. Moreoveronethingthatshockspeoplebackintoattentionistoleaveanalmostuncomfortablylongpause.5. A.Beprepared B.Keeporder C.Sheforgotwhatshewasgoingtosay D.Thatbringsthembacktothespeaker E.Onceyoudothatitgetsridofthefear F.Story﹣tellingmakesmessageseasytoremember G.Storiescombinedataandinformationwithemotion
某同学家买了一个外形非常接近球的西瓜该同学将西瓜均匀切成了8块并将其中一块经抽象后按如图所示的方式放在自已正前方的水果盘中则这块西瓜的三视图是
SomecountriesinEuropeobtainalargeamountofmoneyfromtandannualvisitorsmakegreatcontributionstotheeconomyofthosepopulardestinations.
Futuroscopehassomanyshowsactivitiesandgreatsshopsthatitisdifficulttoseethemall.
方程=的解为x=.
假定你是李华你的英国笔友Tom邀请你下周去他们学校参加文化交流活动并向外国朋友介绍中国的传统绘画.但你忙于准备高考不得不谢绝.请根据下面要点用英语写一封信内容包括 谢绝邀请及理由 推荐朋友王伟参加并说明原因. 注意 词数100左右 可以适当增加细节以使行文连贯 注意书信格式. DearTom Yours LiHua.
改革开放以来我国众多科技实体在各自行业取得了举世瞩目的成就大疆科技华为集团太极股份和凤凰光学等就是其中的杰出代表.上述四个企业的标志是轴对称图形的是
现有一组数据14324x.若该组数据的中位数是3则x的值为
Tomysurprisehegavemethemoney立刻.
假定你是李华.暑假即将来临你希望邀请来自英国的交流生George和你一起在到航空大世界AviationWorld主题公园游玩请你给他写一封邀请邮件要点包括 1.简单介绍主题公园 2.活动或行程安排.
如图四边形ABCD的对角线相交于点O且点O是BD的中点若AB=AD=5BD=8∠ABD=∠CDB则四边形ABCD的面积为
Forasmanyas8000yearsbeforeEuropeancontacttheSanJuanIslandswereinhabitedbytheNorthernStraitsSalishpeoplesandothernativepeopleseasonallypreservingfoodinsummerforwintersspentelsewhere.Allweredrawntotheislandsbytherichabundanceoffoodandmaterialsfoundhere. Inthemid﹣1800sacompanycametotheSanJuanIslandsfollowingitsnumerousinternationaltraderoutes.OneemployeeknownasFridaysettledalonetheareaofwhatisnowthetownofFridayHarbor.ThiscausedmanytorefertotheplaceasFriday'sHarbor. By1900FridayHarborhadapopulationofonlythreeorfourhundredresidents.Roadandtelephonenetworkslinkedthetowntotherestoftheisland.Thecommunitywasgrowingandmanypublicfacilitieshadadded.Whatthesebuildingshadincommonwassimplicityofdesign.Theywereattractiveandfunctionalbutwithoutcomplexdecoration.Typicallybothresidentialandcommercialbuildingswerebuiltwithlocalwood.Moneywassolittlethatitcouldn'tbeusedfortheunnecessaryandsomostbuildingswerepaintedwhitemoreforfunctionalprotectionagainstrotthanfordecoration.Thetownworeapoorlookuntilthelate1960swhentourismretirementrealestate房地产constructiontheartsandavarietyofcottageindustriesbegantotakehold.Todaythetownisagainbusyandbooming.Over6000peopleliveinthetown. Thoughthetraditionalindustrieshaveallbutvanishedtherearestillmanyvisibleremindersofthepioneerera﹣100﹣yearoldorchards果园kitchengardensturn﹣of﹣the﹣centurywoodenbuildingsandcompanionablerooflines﹣allacquaintislandersandvisitorsalikewithFridayHarbor'sspiritedearlydays. 1HowdidtheSanJuanIslandshelptheancients? A.Theyprovidedthemwithatemporaryshelter. B.Theyfunctionedastouristspots. C.TheyprotectedthemfromcolonialEuropeans. D.Theyplayedaroleasaninternationaltradecentre. 2WheredidthenameofFriday'sHarborcomefrom? A.Thenameofthecompany. B.Thedaywhenitwasfound. C.Aninternationaltraderoute. D.Thefirstresidentofthetown. 3WhatdoesParagraph3mainlytellus? A.TheFridayHarbor'sfuture. B.TheFridayHarbor'sdevelopment. C.TheFridayHarbor'spopulation. D.TheFridayHarbor'sarchitect. 4WhatattractsvisitorstotheFridayHarbor? A.Therichabundanceoffood. B.Thebusybutwealthylife. C.Theuniquehistoricsites. D.Thecomfortablecommunity.
I认出了himassoonashecameintotheroom.
Iwasasingleparentoffoursmallchildrenworkingatalow﹣paidjob.Moneywasalways1butwehadaroofoverourheadsfoodonthetable2onourbacks.ItwasChristmastime.We3downtowntoseetheChristmaslightsandenjoyedaspecialdinner4thebigexcitementforthekidswasthefunofChristmas5atthemall购物中心.Theytalkedandplannedforweeksaheadoftime6eachotherwhattheywantedforChristmas. Thebigdayarrived.I7eachofthefourkidsatwenty﹣dollarbillandaskedthemto8forgifts.Theneveryonescattered散开. Backinthecardrivinghomeeveryonewas9aboutChristmaslaughingandaskingeachotheraboutwhattheyhad10.InoticedGingermyyoungerdaughterhadonlyonesmallandflatbagwithher.Icould11enoughthroughtheplastic12totellthatshehadboughtcandybars﹣﹣﹣fifty﹣centcandybars!Whatdidshe13withthattwenty﹣dollarbillIhadgivenher?Iwasso14.AftergettinghomeIcalledherintomybedroomandclosedthedoor.Thiswaswhatshetoldme Iwaslookingaround15ofwhattobuyandI16toreadthelittlecardsononeoftheSalvationArmy'sGivingTrees.Oneofthecardswas17alittlegirlfouryearsoldandallshe18forChristmaswasadollwithclothesandahairbrush.SoItookthecardoffthe19andboughtthedollforher.Wehavesomuchandshedoesn'thaveanything. Myanger20andIhadneverfeltsorichasIdidthatday. 1A.powerful B.tight C.valuable D.available 2A.books B.babies C.bags D.clothes 3A.drove B.ran C.rode D.walked 4A.since B.and C.but D.because 5A.working B.shopping C.eating D.playing 6A.reading B.studying C.helping D.asking 7A.gave B.sent C.passed D.dropped 8A.wait B.beg C.search D.apply 9A.curious B.excited C.careful D.nervous 10A.served B.found C.received D.bought 11A.see B.take C.get D.judge 12A.hairbrush B.card C.bag D.bar 13A.play B.do C.gain D.begin 14A.worried B.satisfied C.happy D.angry 15A.thinking B.reminding C.dreaming D.hearing 16A.regretted B.stopped C.hesitated D.returned 17A.on B.along C.for D.with 18A.wanted B.prepared C.sold D.saved 19A.roof B.window C.tree D.doll 20A.increased B.continue C.lost D.disappeared
HopiIndianTours HopiToursisoperatedfromSecondMesaArizonaontheHopiIndianReservation.ThisisauniquevenueforexperiencingHopiancestrallandsandculture. Overview ExperiencethetruevalueofthesebeautifullandsandlearnhowtheancientwayoftheHopitribe部落hassurvived.AftervisitingHopiculturalsiteseachdayyoucanrelaxwithmulti﹣mediapresentationsofHopihistoryandculture. Visitorinformation Theprimarytouristseasonisinthesummer.Ittendstobecoldandrainyduringtheotherseasons.Summerishotsobringappropriateclothing.Ourtoursincludewalkingsoweencouragetourparticipantstobringcomfortablefootwear.AnumberofguidebooksincorrectlystatethatvisitorsarerequiredtoobtainpermissionbeforeenteringtheHopiReservation.HoweverpermitsarerequiredforvisitingparticularareasontheHopiReservationthatmaybeculturallysensitive. EntrancefeesHalfdayFullday Adults$60$100 Children5﹣17$30$50 Group20ormore$40$70Childrenunder5free Allratesincludeaguide.Additionalratesforweekendtoursarenotedbelow.Thereareextrachargesiftransportationmealsorlodging住宿arerequired.CallHopiReservationInformation928324﹣6839. Weekendtours VisitHopiancestralsites.Youwillseetraditionalarts&craftsandmeetHopicraftsmen.VisittheHopiCulturalCentertotastevariousHopifoods.WeekendtoursincludeSaturdaynightlodgingtourluncheswithHopisnackstransportationandentrancefeeseveningpresentationstourguidesandtraditionaldinner. $300perperson. Artsandcrafts PotteryrugsanddollscanbepurchasedthroughouttheHopiReservationinshopsandgalleries. Lodginganddining Thereisonemotel汽车旅馆ontheReservationtheHopiCulturalCenterMotel.Call928734﹣6493forreservations.Thereisanovernightcampgroundnextdoorlimitedtoatwo﹣nightstay.Thereareanumberofdiningfacilities设施andtake﹣outshopsontheHopiReservation.AlargerestaurantservingAmericanandtraditionalHopifoodislocatedattheHopiCulturalCenter.Severalfamiliesineachvillageservefoodfromtheirhomes﹣lookoutforsignsintheirwindows. 1Whatisplannedattheendofeachtour? A.Alecture. B.AHopidinner. C.Apresentation. D.Ashoppingtrip. 2Wheredoyouneedpermissiontogo? A.Thegalleries. B.Hopivillages. C.Culturallysensitiveareas. D.TheHopiCulturalCenter. 3Howmuchwillacouplepayforaweekendtour? A.$160. B.$200. C.$400. D.$600. 4WhatcanyoudoontheReservation? A.Campfortwonights. B.TryonHopicostumes. C.Meetthetribeleaders. D.MaketraditionalHopifood.
若关于x的不等式组有解则在其解集中整数的个数不可能是
在一段长为1000的笔直道路AB上甲乙两名运动员均从A点出发进行往返跑训练.已知乙比甲先出发30秒钟甲距A点的距离y米与其出发的时间x分钟的函数图象如图所示乙的速度是150米分钟且当乙到达B点后立即按原速返回. 1当x为何值时两人第一次相遇 2当两人第二次相遇时求甲的总路程.
Sherefusedtomakesuchabig决定.
先化简再求值•﹣其中a=2.
Hashereturnedthatbookyou借给him.
我们知道很多数学知识相互之间都是有联系的.如图图一是“杨辉三角”数阵其规律是从第三行起每行两端的数都是“1”其余各数都等于该数“两肩”上的数之和图二是二项和的乘方a+bn的展开式按b的升幂排列.经观察图二中某个二项和的乘方的展开式中各项的系数与图一中某行的数一一对应且这种关系可一直对应下去.将s+x15的展开式按x的升幂排列得s+x15=a0+a1x+a2x2+…+a15x15. 依上述规律解决下列问题 1若s=1则a2= 2若s=2则a0+a1+a2+…+a15=.
它吸引力越来越多的国内外游客.
下表是甲乙两名同学近五次数学测试满分均为100分的成绩统计表 根据上表数据成绩较好且比较稳定的同学是.
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以下作文.文中共有=10处语言错误每句中最多有两处.每处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\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意每处错误及其修改均仅限一词只允许修改10处多者从第11处起不计分. DearMissWang I'mhavingsometroubleaboutmyclassmatesatthemoment.I'mgettingwellwithaboyinmyclass.Weoftendohomeworktogetherandweenjoyhelpeachother.Wehavebecomerealgoodfriends.Butotherstudentshavestartedgossiping.TheysaidthatthisboyandIhavefalleninlovethishasmademeangry.I'mnotverygoodatcommunicatingwithpeople.AlthoughItrytoexplainbutIstillfindithardtomakeothersconvinced.Idon'twanttoendthefriendshipbutIhateothergossipingWhatshouldIdo?Iwouldbegratefulthatyoucouldgivemesomeadvices. Yours Lisa
Ispentthewholedaylookingaroundandfoundthehousedisappeared完全地.
热门题库
更多
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库