首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
若x,y满足约束条件,则目标函数z=2x+y的最小值为( )
查看本题答案
包含此试题的试卷
高三上学期数学《》真题及答案
点击查看
你可能感兴趣的试题
设变量xy满足约束条件则目标函数z=x+2y的最小值为A.2B.3C.4D.5
变量xy满足约束条件则目标函数z=y-2x的最小值为
-7
-4
1
2
设变量xy满足约束条件则目标函数z=3x-2y的最小值为
)-5 (
)-4 (
)-2 (
)3
已知xy满足约束条件1求目标函数z=2x+y的最大值和最小值;2求目标函数z=2x-y的最大值和最小
设变量xy满足约束条件若目标函数z=a|x|+2y的最小值为﹣6则实数a等于
2
1
﹣2
﹣1
设变量xy满足约束条件则目标函数z=3x-2y的最小值为
-5
-4
-2
3
设xy满足约束条件若目标函数z=ax+bya>1b>2的最大值为5则的最小值为________.
变量xy满足约束条件则目标函数z=y-2x的最小值为
-7
-4
1
2
若变量xy满足约束条件则目标函数z=2x+3y的最小值是________.
设变量xy满足约束条件则目标函数z=2x+y的最小值为
2
3
5
7
若变量xy满足约束条件则目标函数z=2x+3y的最小值是________.
设变最xy满足约束条件则目标函数z=x+2y﹣l的最小值为
0
1
2
3
满足约束条件|x|+2|y|≤2的目标函数z=y-x的最小值是________.
设变量xy满足约束条件则目标函数z=x+2y的最小值为
2
3
4
5
设变量xy满足约束条件则目标函数z=y-2x的最小值为
- 7
-4
1
2
若xy满足约束条件目标函数z=ax+2y仅在点10处取得最小值则a的取值范围是
设实数xy满足约束条件若目标函数z=a2+b2x+y的最大值为8则a+b的最小值为.
设变量xy满足约束条件则目标函数z=2x+5y的最小值为
﹣4
6
10
17
设xy满足约束条件若目标函数z=abx+ya>0b>0的最大值为8则a+b的最小值为
2
4
6
8
设xy满足约束条件则目标函数z=-x+2y的最小值是.
热门试题
更多
1分IfirstmetLisathreeyearsagowhenweataradiostationtogether. A.haveworked B.hadbeenworking C.wereworking D.hadworked
2分好的身体状况基于健康的饮食习惯 Goodphysicalconditionisbasedonhealthy.
1分TomisfacingadifficultbetweenstayingwithhisfamilyandworkinginTibet.choose
1分Thejokewassofunnythatitmadehimagainandagain. A.laugh B.tolaugh C.laughed D.laughs
5分DavidHelloOfficeCentre. SusanHiisthatyouDavid?1? DavidFinethankyou.SusanI'msogladthatyouphoned.HowisyourstudyinLondon? SusanQuitewell.Andhowaboutyourteaching? DavidOK.Thestudentsareverygood.OhdidItellyouaboutmytriptoLondon? SusanYes2? DavidI'mleavingattwotomorrowafternoon. Susan3? DavidMyfightnumberisBC266 I'llgettotheairportatfour.Susancanyoupickmeupatheairport? Susan4.Ihavetobringmymotherhomefromhospitalatthattime. DavidIsee.It'sallright.Icanmanagetofindyourplacebymyself. SusanWellDavidI'llhavemyfriendTompickyouup. DavidOhit'sgood.ButIhaveneverseenhimbefore.Whatdoeshelooklike? SusanHelooksverystrongandtall.Wellhe'llcallyouwhenyouarrive.I'mlookingforwardtoseeingyou DavidThankyou. Susan5 1. 2. 3. 4. 5.
4分 IhavebeeninChinafornearlyayear.Asaforeignerit'shardformetellwhatChinesepeopleare1.ButmyexperienceinBeijingsaidsomething. AcoupleofweeksagoIwenttobuyfourbigsuitcases行李箱fortravel.Itsuddenlyrainedheavily2Iwasgoingdownthestreet.Astrangercalledmeintohislittleshop.Heofferedmeacupofteaandachair.Whentheraingot3Ithankedhimandrushedtoastorenearbytobuymysuitcases. Ifyou'veevertriedtopushfourbigsuitcasesbyyourselfyoumayunderstandmysituation.Ilookedsillyforthesuitcasesweredancingwildlyacrossthefloor.ThenIgotatouchontheshoulder.Itwastheseller.HesignedthatIshouldwait.Afewminuteslaterhedroveupinacarandputthesuitcases4.Thenwewentdrivinghappilyalongtheroadtomyhome.Iofferedhimsomemoneybutherefused.InbrokenEnglishhesaidFeelgood…helpyou. NowyoucanseeChinesepeoplearealwaysreadytohelpyou. 1. 2. 3. 4.
2分Doesyourbreakfast﹣roomgetawonderfulviewofthelakefromfourwindows?改为肯定句 breakfast﹣roomawonderfulviewofthelakefromfourwindows.
1分﹣HelloSally!CanIseeMr.Brown? ﹣.I'lltellhimyouarehere. A.Whatapity B.Justaminute C.Congratulations D.Nevermind
ofarescaredlionsyou ?
10分Post﹣00s零零后isadocumentaryaboutgrowingup.Itshowsthereallivesofchildrenwhowerebornbetween2000and2009.Theystrugglewithschoolwork.Theyfaceproblemsinrelationshipswithothers.Theydon'tknowwhattodoifayoungerbrotherorsisterisbornintothefamily.ButthisfiveepisodeserieswhichareairedonCCTV﹣9fromAug20isdifferentfromotherTVprogramsaboutgrowingup. Itwasfilmedover10years.Theshowmakersfollowedthegrowthosagroupofkidsfromkindergartentomiddleschool.Inotherwordseverythingintheseriesisreal.Suchstoriesknownascoming﹣of﹣age真实成长storieshaveaspecialattraction.Theyfeedourcuriosityforseeingsomeoneelse'slife.Webecomemoreandmoreinterestedinthecharactersasifwetrulyknowthem.Andwhileweenjoytherealstorieswealsofeelthehardshipofreality.Afterallthere'snoscript副本andthere'snoturningback﹣﹣thisisreallife. Youcanalsoseereallifeina2014filmBoyhood.ThefilmfollowsthelifeofMasonJrfor12yearsfromwhenhewas6tohissenioryearofhighschool. Whilecoming﹣of﹣agestoriesmaylookordinaryontheoutsidetheyoftenallowustolookthroughrealityandseesomethingamazing﹣﹣thepoweroflifeitself. AsUSwriterErnestHemmingwayoncewroteAnyman'slifetoldtrulyisanovel.AndwhenitcomestoPost﹣00it'salsoareallygooddocumentary. 1.ThedocumentaryPost﹣00sisaboutteenagerslife. 2.Wearecuriousaboutsomeoneelse'slife. 3.BoyhoodisaboutMasonJr'slifeaboyagedfrom6to19. 4.WecanseethepoweroflifeitselfwhenwewatchPost﹣00. 5.FromthepassagewecanknowthatthestoriesinPost﹣00maybemadeup.
1分Mygrandmaisinterestedintakingwithhermobilephone.photo
1分HappyNewYearChristina.Here'sagiftyou. A.in B.from C.for D.with
6分Apunctualpersonisinthehabitofdoingathingatthecorrecttimeandisneverlateforanything. Anunpunctualmanneverdoeswhathehastodoattherighttime.Heisalwaysinahurryandintheendlosesbothtimeandhisgoodname.Alostthingmaybefoundagainbutlosttimecanneverbegotback.Timeismoreusefulthanmaterialthings.Infacttimeislifeitself.Anunpunctualmanisalwayswastinghismostimportantthingsaswellasothers'.Anunpunctualpersonisalwayssayingunhappilythathefindsnotimetoanswerlettersorreturncalls.Butthemanwhoreallyhasmuchtodoisverycarefulofhistime.Heknowsthathecannotfinishallhisworkunlesshecarefullydoeseverypieceofwork. Beingunpunctualisthesignofdisrespect不尊重towardsothers.Ifapersonisinvitedtodinnerandarriveslaterthanthetimewhenheshouldbetherehekeepsalltheotherguests客人waitingforhim.Usuallythiswillbethoughtasagreatdisrespecttothehostandalltheotherguests. Notlikeapunctualpersonanunpunctualonecan'tdohisdutywonderfullywhetheritispublicorpersonal.Imaginehowitwouldbeifthosewhoshoulddoimportanttasksfailedtobeontime.Amanwhoisknowntobeoftenunpunctualisneverbelievedbyhisfriendsorfellowmen. 1.TheChinesemeaningofthewordpunctualinthispassageisprobably. A.听话的 B.守时的 C.守纪律的 D.能干的 2.WhichofthefollowingisTRUEaccordingtothepassage? A.Anunpunctualpersonoftenhasmoretime. B.Anunpunctualpersonhasmoreworktodo. C.Apunctualpersonoftenhasabusylife. D.Apunctualpersonoftendoeshisworkwonderfully. 3.Whenyouareinvitedtodinneryou'dbetterarrivethere. A.inahurry B.afterthehost C.atthedecidedtime D.beforeotherguests 4.Fromthepassagewelearnthatanunpunctualmanusuallyintheend. A.savestimeforothers B.leaveshisfamilyandfriends C.getshischancesandknowledge D.loseshistimeandgoodname.
1分Whichofthefollowingunderlinedpartsisdifferentinpronunciationfromtheothers? A.Let'srelaxourselvesforawhile. B.Canyoutellmeyouraddress? C.Gotothewebsitetogetpictures. D.Shallwehavesevenapples?
1分Aftertwohours'discussionthey最终reachedanagreement.
5分Ifyoucan'tstandupstandout!ThisisthesloganofanIrishcompanynamedIzzyWheels.ItwasfoundedbytwosistersAilbheandIszbelKeane.Theyhavewonthe2017AccentureleadersofTomorrowaward. Wheelchairsusuallylookalittleugly.Theyareneverseenasasymbolofpeople'spersonality.Butthetwogirlshavechangedthat. TheyoungestsisterIsabelwhowasbornwithaseriousillnessisparalyzed瘫痪fromherwaistdown.Idon'twantawheelchairwhichlookslikeacommonone.IwantmywheelchairtobesomethingfashionableandIwantittoshowmybrightandsunnypersonality.saidIsabel. Isabel'selderAilbheatalenteddesigneralsofoundthewheelchairdidn'tsuithersister'spersonalitysotheyworkedtogethertomakeitlookmorefashionablewithspecialwheelchaircovers. AilbherecentlydesignedspecialsilverandblackwheelchaircoversforIsabel'swheelchair.Shehascreated15setsofcoversintotalsothathersisterwillhaveachangeoffashionmoreoften. NowtheircompanyIzzyWheelssellsfashionablewheelchaircovers.Theyhavealreadychangedwheelchairusers'livesacrossthecountryIzzyWheelshasshowntotheworldthatawheelchaircanbeaworkofart. Iamnolongerseenasthepoorgirlinawheelchairbypassers﹣by.IamnowseenasafashionablepersonwithcoolwheelssaidIsabel. 1.WhatisAilbhe? Sheis. 2.WhyisIsabelparalyzed? Sheisparalyzedbecauseof. 3.WhydidAilbhewanttochangehersister'swheelchair? Becauseshethoughtthewheelchairdidn'tsuithersister'spersonality. 4.Howdothetwosisterschangethewheelusers'lives? Theymakeitby. 5.WhatdootherpeoplethinkofIsabelnow? Theythinksheisratherthanapoorgirlinawheelchair.
1分In2022BeijingwillhosttheWinterOlympics.mybrotherandIwanttowatchit. A.Neither B.All C.Either D.Both
happyherbefriendssheifcomewill .
2分我的十二岁生日对我来说是一个精彩回忆 Mybirthdayisawonderfulmemoryforme.
1分﹣Whatwouldyouliketohaveforsupper? ﹣EithernoodlesorriceOK.Idon'tmind. A.are B.is C.were D.was
1分luckythewinnerofthegameshowis!Aeleven﹣daytripabroadforfree! A.How B.What C.Whata D.Whatan
1分Themanager'svoicesoundedonthephone.Heofferedtoshowusaroundthecompany. A.softly B.friendly C.gently D.seriously
1分Lisalearnsroadbywalkingtoandfromschoolalongwithherparents.safe
1分WhenyouarelearningEnglishuseityouwillloseit. A.but B.or C.then D.and
runningthetheyonkeptplaygroundon .
10分Alittleboythoughtofhimselfastheunluckiestchildintheworldbecausepoliomyelitis小儿麻痹madehimunabletowalklikenormalpeople.Hehardlyplayedwith1classmates.Notonlyhisclassmatesbuthisheadteacher2himasanunsociablechild.Whenhewasaskedtoanswerquestionsinclasshealwaysloweredhisheadwithout3word. Onespringtheboy'sfatherwantedtoplantsometreesinfrontofthehouse.Hetoldhischildrentoplantatreeeach.ThefathersaidWhoevergrowsthebesttreegetagift.Hisbrothersandsistersallwenttothebackyardtogetthetree4.Althoughtheboyalsowantedtogethisfather'sgift.hethoughtthetreeheplantedwoulddiesoon.Soheonlywatereditonceandnever5it. Afewdayslaterwhenthelittleboywenttoseehistreehewassurprisedtofindthatitgrewsomefreshleaves.Histreeappearedgreenerthanthetreesofhisbrothersanssisters.HisfatherkepthispromiseandboughtthelittleboyagiftandsaidtohimIbelieveyou6agreatbotanistwhenyougrowup. Sincethenthelittleboyslowlybecameoptimistic.Onenightthelittleboylayonthebedbut7sleep.Lookingatthebrightmoonlight8thewindowhesuddenlyrememberedtheteacheroncesaid.Plantsgenerallygrowatnight.Whynotgotoseethetree?Whenhecametothebackyardhefound9.AllofasuddenheunderstoodHowchildishhe10!Hisfatherwassecretlytakingcareofhissmalltreewithlove!Hereturnedtohisroomwithtearsinhiseyes. Yearspassedthelittleboydidn'tbecomeabotanistbuthebecamethePresidentofUnitedStates.HisnamewasFranklinRooseveltwithhisfather'sloveandencouragement. 1.A.him B.his C.he D.himself 2.A.regarded B.regards C.hadregarded D.hasregarded 3.A.an B.the C./ D.a 4.A.water B.watering C.watered D.waters 5.A.lookafter B.takecareof C.takecare D.lookedfor 6.A.willbecome B.become C.became D.havebecome 7.A.shouldn't B.needn't C.mightn't D.couldn't 8.A.inside B.outside C.upside D.downside 9.A.ifhisfatherhadwateredhistree B.whyhisfatherwouldwaterhistree C.thatthisfatherwaswateringhistree D.howisfatherwateredhistree 10.A.usedtobe B.usedtolike C.wasusedtodoing D.getusedtobe
2分Myfatherwenttoexerciseinthefitnesscentretwiceaweeklastyear.对划线部分提问 didyourfathergotoexerciseinthefitnesscentrelastyear?
2分Peoplewilldesignrobotstodomosthouseworkforhumaninthenearfuture.改为被动语态 Robotswilltodomosthouseworkforhumaninthenearfuture.
2分会议将于二月举办 Themeetingwillbeheld.
2分wanttowithfriendsintheirfreetimepeoplehavefun连词成句
热门题库
更多
高一下学期物理
高三下学期数学
高三上学期数学
高一下学期英语
教案备课库
高一上学期生物
高一下学期生物
高二上学期数学
高二上学期物理
高二上学期英语
高二上学期生物
高二下学期数学
高二上学期化学
高二下学期物理
高三下学期物理
高三上学期物理