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若变量x，y满足约束条件，则x+2y的最大值是（ ）
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高二下学期数学《》真题及答案
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若变量xy满足约束条件则2x+y的最大值为.
若变量xy满足约束条件则z＝x－2y的最大值为
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若变量xy满足约束条件则w=4x•2y的最大值是__________
若变量xy满足约束条件则z=2x+y的最大值.
若变量xy满足约束条件则x+y的最大值为.
变量xy满足约束条件若z=2x﹣y的最大值为2则实数m等于
﹣2
﹣1
1
2
已知变量xy满足约束条件1≤x+y≤4-2≤x-y≤2.若目标函数z=ax+y其中a＞0仅在点31处
若变量xy满足约束条件则z=x-2y的最大值为.
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设变量xy满足约束条件则2x＋3y的最大值为____________.
已知变量xy满足约束条件若z＝2x－y的最大值为3则实数m等于________.
已知变量xy满足约束条件若z=2x-y的最大值为2则实数m的值为.
设变量xy满足约束条件其中a>1若目标函数z＝x＋y的最大值为4则a的值为________.
若变量xy满足约束条件则z=2x+y的最大值为.
若变量xy满足约束条件则z＝2x＋y的最大值等于
7
8
10
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设变量xy满足约束条件则目标函数z＝4x＋2y的最大值为
12
10
8
2
若变量xy满足约束条件则目标函数z=x+2y的最大值为.
若变量xy满足约束条件的最大值=.
若变量xy满足约束条件且z＝5y－x的最大值为a最小值为b则a－b的值是
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若变量xy满足约束条件则z=2x+y的最大值和最小值分别为.
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7.5分Ihavealwaysthoughtofmyselfasadoer.InworkIdefinitelywasandcontinuetobe.AsamomI'mmostlyadoer.HowevermytreatmentforbreastcancermademerealizeIhadnotbeenadoerinthewayIwantedtobe﹣butthatwasabouttochange. IhavebeenafraidofflyingsinceIworkedinnewsandcoveredmanyplanecrashesandhadmyownhorrificexperience.Myfamilyhadneverbeentoanothercontinenttogether.Nowthatthechemo化疗wasoverasagifttomyselfmykidsandmymomItookthemalltoLondontocelebratelifebeforebeginningradiationeveryweekdayforsixweeks. ThistimeIdecidednottothinktoomuchaboutit.Whenyoulookinthemirrorwithouthairyoudoyourbesttogetthroughyourdayasifitwereadaybeforeyoudiscoveredyourlump肿瘤.Theneverythingseemsdoable.SoIjustbookedthetrip. OurflightonBritishAirwayswasmybestever.Idon'tknowifitwasthesizeoftheplanethecomfortoftheseatstheTVsorthefamilyfriendlinessthatmadethetimeflybyforme.OneveryflightIsayaquickhellotothepilotwhichcalmsme.Thistimethepilottookextratimetoexplainthemapsandweatherpatternsandcalmedmedown.Thatcertainlyhelpedabitorwasitpossiblethatchemocuredthisfeartoo? EverydayIplannedadifferentadventure﹣everythingfromtoursofBuckinghamPalaceandWindsorCastletotheoriginalbustour.Theylearnedandlovedeveryminuteandshockinglytheydidn'tcomplain. Ihadwantedtodosoforyears.Lifeandworkhadgotteninthewaybutwefinallydidit.Iplannedthisincredibletripduringchemoandwillplananother.Sometimesthebestadventurescomeaftersurvivingyourgreatestfears. 1TheunderlinedworditinParagraph3refersto. A.herfearofflying B.herbreastcancer C.thefinishedchemo D.theplannedfamilytrip 2Ontheauthor'sfamily'striptoLondon. A.theauthorovercameherfearofflyingthankstoherfamily B.thekidswerenotsointerestedintheplacestheyvisited C.thefamilyenjoyedthemselvesduringdifferentadventures D.thefamilydidn'tvisitmanyplacesbecauseoftheauthor'shealthcondition 3Thebesttitleforthetextwouldbe`. A.CancerGetsintheWay B.SurvivingtheFear C.LivingaPlainLife D.ASuccessfulDoerasMom
15分为配合学校开展的垃圾分类工作学生会向全校学生发出了垃圾分类从我做起的倡议请你代表学生会用英语写一封倡议书.内容包括 1.垃圾分类的做法 2.垃圾分类的益处 3.呼吁全体学生一起参加. 注意1.词数80左右2.可适当增加细节以使行文连贯. 参考词汇垃圾分类garbageclassification厨余垃圾leftovers电池batteries.
7.5分I'mready.saidAlyssaCarsonanow﹣17﹣year﹣oldastronaut﹣in﹣trainingfromBatonRougeLouisiana.Forherridingthemostaggressiverollercoasterintheparkisnotabigdeal.IfallgoesaccordingtoherplansNASAwillsendhertoMarsin2033makingherthefirsthumantostepfootontheplanet.Shewillspendtwotothreeyearsdoingsomethingonitgrowingfoodperformingscienceexperimentsandsearchingforsignsoflife.TheMartianisactuallyveryaccurate.hesaid.Alotofthethingsthathappenedinthemoviearesimilartowhatisgoingtohappen.She'sdevotedherentirelifetopreparingforthisjourney. Herloveforspacestartedwhenshewas3yearsoldandwatchedacartooncalledTheBackyardigans.FiveanimalpalsgoonimaginaryadventuresintheirbackyardincludinginonepartamissiontoMars.Ithought‘Thisredplanetissocool'shesaid.Istartedwatchingvideosofrovers'landingonMars.IhadalargemapofMarsinmyroomIwouldlookat.Westartedgettingtelescopessowecouldlookatspace. At7herfathertookhertospacecampinHuntsvilleAlabama.Thatwastheweekendofmylifeshesaid.IgottolearneverythingIhadbeenwantingtoknowandmore…Igottoseealife﹣sizerocket.Shecherishedtherocketsomuchthatshereturned18times.Attheageof12shebecamethefirstpersoninhistorytoattendallthreeNASAspacecampsinHuntsvilleAlabamaQuebecCanadaandIzmirTurkey. Atfirstshemasteredthebasicsofspaceandhowhumanshaveexploreditthroughouttime. Asshegotoldershesimulated模拟missionstryingtoreachadestinationingravity﹣freeweightlesszones. Whenshewas9shemetNASAastronautSandraMagnus.Theexperiencedexplorertoldhershewasheragewhenshedecidedtogotospace.AtthatmomentAlyssaknewherloveofspacewasnotapassinghobby.Ididthesamethingasotherkidslikeswitchingmymindaboutcareerswantingtobeateacherorthepresidentonedayshesaid.ButthewayIalwaysthoughtaboutitwasIwouldbecomeanastronautgotoMarscomebackandthenbeateacherorthepresident. 1AlyssaCarsonisgreatbecause. A.shehascreatedmodelmissionstotheMars B.sheistheyoungesttohavecompletedastronauttraining C.sheislikelytobethefirsthumantoperformdifferenttasksontheMars D.shehasvisitedthespacecampinHuntsvilleAlabamafornearly20times 2NASAastronautSandraMagnuswasmentionedinthelastparagraphtostress. A.thepowerofspacedream B.thepopularityofspacetravel C.theimportanceofcareerchoice D.theexcitementofherspaceexperiences 3Whatistheauthor'spurposeofwritingthetext? A.TointroduceAmericanspaceindustry. B.TopromotethevaluesofAmericanteens. C.ToencouragetourstotheMars. D.TopresentarisingAmericanspacestar.
3分多亏他及时的帮助我改掉了懒惰的坏习惯并对自己的进步感到满意.thankstogetridofsatisfied .
30分Myfather'sillnesshadbeendiagnosedasoneoftheworstcancers.1awell﹣builtmanhehadlostmorethan30pounds.Thedoctors2thathehadonlythreetosixmonthstolive. TheotherdaywhenmyfatherwassittingupinbedI3himandsaidDadIfeel4sorryforwhathashappenedtoyou.YouneverknowhowmuchIreallyloveyou.Ileanedovertogivehimahug5hebecametense. ComeonDad.[said.Iknewshowing6wasnotourusualwayofrelation.Iasked himtositupsomemoreandItriedagain.Thistimehoweverhewas7moretense.Iwasalittleimpatientand1couldfeeltheoldresentment不满startingto8.ForyearsourgreetinghadbeenacoldandformalhandshakethatsaidHellohowareyou?MyfatherhadalwaysbeenveryGermanic.Inhischildhoodhisparentsmusthavetaughthimhowto9hisfeelingsinordertobea10. Lettinggoofmylong﹣held11toblamehimforourdistanceIwasactuallylookingforwardtothe12ofgivinghimmorelove.IsaidagainComeonDadputyourarmsaroundme.Iagainleanedupclosetohimatthe13ofthebedwithhisarmsaroundme. 14happened.ForaninstantafeelingofI15youthunderedthrough.NowbothheandIwaitedforthatmomentary16tohappenagain.Ittookmonths17hewasabletolettheemotionsinsidehimpassthroughhisarmsto18me. Afterallhewastryingto19thehabitsofanentirelifetimeandthattooktime.Afteraroundtheone﹣hundredthhughefinallysaidout20forthefirsttimeIcouldeverrecallIloveyou. 1A.Normally B.Generally C.Actually D.Apparently 2A.advised B.apologized C.urged D.concluded 3A.supported B.encouraged C.approached D.reminded 4A.highly B.deeply C.mainly D.mostly 5A.then B.so C.and D.but 6A.affection B.responsibility C.generosity D.excitement 7A.almost B.any C.even D.less 8A.pickup B.buildup C.keepup D.giveup 9A.shutoff B.putoff C.takeoff D.getoff 10A.teacher B.son C.father D.man 11A.ability B.desire C.experience D.plan 12Adifficulty B.adventure C.challenge D.memory 13A.end B.middle C.bottom D.edge 14A.Something B.Nothing C.Everything D.Anything 15A.support B.love C.hate D.oppose 16A.kindness B.goodness C.closeness D.happiness 17A.before B.when C.since D.that 18A.praise B.hold C.encourage D.raise 19A.develop B.form C.change D.kick 20A.calmly B.hopefully C.peacefully D.loudly
15分假如你是李华计划暑假去英国旅游.请你给在旅行社工作的朋友Jack写信内容包括 1.求荐必去景点 2.咨询准备工作 3.询问注意问题. 注意1.词数80左右 2.可适当增加细节以使行文连贯.
3分著名校友们的巨大成就鼓舞我们继续努力学习以过上幸福的生活.inspirecarryonleada…life .
如图在△ABC中点P在BC边上∠PAC＝60°PC＝2AP+AC＝4 Ⅰ求边AC的长 Ⅱ若△APB的面积是求sin∠BAP的值．
30分Thislifeissofullofbeautifulmoments.Allyouhavetodoisopenyoureyesandyour1toseethem.Isawonejusttheotherday. ThelocalelementaryschoolhadjustletoutandI2myselfbehindaschoolbusasIwas3home.Thebusstoppedbyahouse4ontopofahill.Alittlegirlnomorethan7yearsoldhoppeddownthebusstepsandstarted5upthedrivewaytowardthehouse.The6onherfacewascontagious有传染性的.Herlonghairwasbouncingoffhershouldersandherpinkbackpackwastrailingbehindher7sheran.Ilookedupthehilltoseewhereshewasgoingandsawherdad8her.Asshegotcloserandcloserherdadsmiledandkneltdownto9her.Thesecondshegottohimhewrappedhis10armsaroundherandgaveherahugehug. Myeyes11abitasIwatchedthis12andrememberedallthetimesmyownchildrenhadrunintomy13withsmilingfacesandlovinghearts.Everysingle14fromthemwasafountainofyouthandatreasureof15.Mylovelytripdownmemorylanewas16whenIheardthecarbehindmehonkitshorn.Isawtheschoolbusquickly17andstartedtofollowitagain.Ididso18withafullerheartandlighter19thanIhadbefore.Itookthatbeautifulmomentandstoreditsafelyinmysoul20Iknewitwouldremainforever. 1A.door B.ears C.heart D.window 2A.discovered B.realized C.looked D.saw 3A.walking B.driving C.arriving D.leaving 4A.sat B.seat C.sitting D.seating 5A.jumping B.dragging C.running D.passing 6A.look B.surprise C.eagerness D.smile 7A.until B.as C.unless D.because 8A.lookingfor B.watchingover C.waitingfor D.signingto 9A.dress B.shelter C.greet D.help 10A.powerful B.steady C.slim D.bare 11A.closed B.opened C.lowered D.watered 12A.event B.scene C.incident D.appointment 13A.room B.sight C.arms D.memory 14A.word B.hug C.gesture D.tear 15A.value B.freedom C.joy D.care 16A.changed B.corrected C.interrupted D.blocked 17A.givingaway B.pullingaway C.walkingaway D.takingaway 18A.however B.therefore C.besides D.instead 19A.sense B.spirit C.state D.burden 20A.where B.what C.which D.that
30分Noneofusgetoutoflifealivesobebraveandbethankfulforalltheopportunities机会youhave.Thosewere1wordssaidby18﹣year﹣oldJakeBaileyacancerpatient. BaileywasintheleadingpositionoftheStudents'Union.Theyoungmanhadplannedto2athishighschool'send﹣of﹣yearceremony典礼onschedule.3justtheweekbeforehereceivedshocking4.Afterseveralweeksofnotfeelingwelltestsshowedthathehadafast﹣growingformofcancer.Doctorssaidwithout5hewouldonlyhaveweekstolivesotheydidn't6himtotakepartintheevent.ButBaileyputonhisschooluniformalongwithhis7faceandlefthishospitalbedtogivetheinspiringspeechtohis8.Withoutdoubthissurpriseappearance9everyoneattheceremony.Sittinginthewheelchairhebeganto10hisideas.Heexpressedthatastrong﹣willedpersonwouldnoteasily11nomatterhowhardlifewas. AtthespeechBaileyencouragedhisschoolmatesto12theirtime.Thefutureistrulyinourhands.13abouthavingimpracticallong﹣termdreams.Let'sbe14toshort﹣termgoalsHe15.Wedon'tknowwherewemightenduporwhenwewillendupsoworkwithprideonwhatis16us. Whenthesenior17hisspeechwiththeschool's18AltioraPetowhichmeansIfightforhigherthingstheentireroomburstintocheers.19Bailey'smessagewasheardloudandclear.Baileythenclosedhiseyesand20thewordsThankyou. 1A.unbelievable B.genuine C.inspiring D.amazing 2A.speak B.chat C.sing D.debate 3A.so B.Instead C.Besides D.However 4A.fault B.attack C.news D.pain 5A.doubt B.hope C.treatment D.delay 6A.persuade B.allow C.warn D.organize 7A.determined B.frightened C.satisfied D.surprised 8A.friends B.family C.schoolmates D.roommates 9A.amused B.shocked C.affected D.frightened 10A.explain B.form C.share D.change 11A.turnup B.givein C.breakup D.cutdown 12A.gain B.treasure C.spend D.spare 13A.Talk B.Forget C.Care D.Dream 14A.devoted B.limited C.admitted D.lost 15A.continued B.reminded C.sighed D.cried 16A.inplaceof B.infrontof C.inchargeof D.insearchof 17A.replaced B.ended C.began D.decorated 18A.motto B.principle C.rule D.opinion 19A.Finally B.Obviously C.Actually D.Entirely 20A.mouthed B.typed C.recorded D.wrote
已知△ABC的三个内角ABC所对的边分别为abc＝﹣1＝cosAsinA．若且acosB+bcosA＝csinC则角B＝．
1分﹣Lucyisnotcomingtonight. ﹣Butshe! A.promised B.willpromise C.hadpromised D.promises
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