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已知实数x,y满足约束条件,则z=﹣2x+y的最小值为( )
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高三下学期数学《》真题及答案
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已知实数xy满足约束条件则z=2x+y的最小值是.
已知实数xy满足约束条件则z=2x+y的最小值是____
已知实数xy满足约束条件则z=2x+y的最小值为.
.已知实数xy满足约束条件那么z=x2+y2-2x的最小值是.
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
若xy满足约束条件则z=x+2y的最小值为.
已知实数xy满足约束条件则z=3x+y的最小值为.
设实数x和y满足约束条件则z=2x+3y的最小值为
26
24
16
14
设变量xy满足约束条件则z=x-3y的最小值为________.
求函数u=xy+2yz在约束条件x2+y2+z2=10下的最大值和最小值.
已知实数xy满足约束条件则z=2x+y的最小值是__________.
已知变量xy满足约束条件则z=2x+y的最小值为
0
1
4
6
满足约束条件|x|+2|y|≤2的目标函数z=y-x的最小值是________.
若xy满足约束条件则z=x-2y的最小值为
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.
若变量xy满足约束条件则z=3x+y的最小值为________.
已知实数xy满足约束条件则z=2x﹣3y的最小值是.
若变量xy满足约束条件则z=2x-y的最小值为
-1
0
1
2
设实数xy满足约束条件已知z=2x+y的最大值是7最小值是﹣26则实数a的值为
6
﹣6
﹣1
1
若变量xy满足约束条件则z=2x-y的最小值为.
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Themorningafteraneveningflightwithmythenthree﹣year﹣olddaughterIcouldn'twaittogethertoschool.Iwastiredfromtheangerandherinabilitytocommunicatebecauseofherslowedlanguagedevelopment. AsIaccompaniedherintothecarIfeltdesperate.Nothingwasrightwithourworld.ShehadbeenbornaroundthesametimethenationwaswitnessingthebirthofanotherGreatRecession经济萧条.Myjobandmyhousehadbeenvictims.Thenthishappened.Mychild'slanguagedelaywasidentifiedbutdoctorsstruggledtoproperlydiagnosisher.Ifeltlikewebothneededtoberescued. IreturnedthatafternoonasdisenchantedwiththelittlegirlIlovedaswhenIleft. Walkingslowlytowardtheschool'splaygroundgateIfoundherpreschoolteacherracingtogreetme. Youshouldhaveseenhertoday!Hisbreathywordsweresupportedbyexcitement.Ididn'tinterrupt.Seethatclimber.Hepointedtoapieceofwoodenplaygroundequipmentthatlookedlikearockwall.Inodded.WelleverydaysinceshestartedschoolShe'stiredandfailedtomakeittothetop.Hetookabreath.Andtodayshemadeit. Heexpressedhisjoyjustlikehe'dwitnessedherconquering征服MountEverestShecheeredandcelebrated!Iwishl'drecordedit..Hiswordscomfortedme.Mydaughterhadconqueredhermountain.AssherantowardmeIrecognizedsomethingIhadn'tbefore.Isawherperseverance.Isawherstrength.Isawahero. EverydaygreatnesscelebratesordinarypeoplewhodounusualthingsinbigandsmallwaysshowingcouragekindnessloveandselflessnessWeencourageyoutoclickthesebriefaccountsandinviteyoutoshareyourownstoryinourcommunity. 1Whywastheauthor'sdaughterrushedtoschool? A.Themotherwasbusywithherworkasadoctor B.Themotherhadafightwiththedaughterlastnight. C.Themotherbrokedownwhendealingwithherdaughter. D.TheyhadtosellandleavetheirhouseduetoGreatRecession. 2Whichofthefollowingbestexplainsdisenchantedunderlinedinparagraph3? A.Disturbed. B.Dissatisfied C.Distrusted D.Disappointed. 3Whatmadethelittlegirl'spreschoolteacherfeelexcited? A.ThatshesucceededinconqueringMountEverest. B.Thatshemanagedtoclimbupthewoodenclimber. C.Thatshegotthefirstplaceintheschoolsportsmeeting D.Thatshedevelopedtheabilitytocommunicatenormally. 4Whereisthetextprobablytakenfrom? A.Ontheradio. B.Fromamagazine. C.Fromaschoolpaper D.OntheInternet
阅读下面短文根据其内容写一篇60词左右的内容概要. Manypeoplearelongingforthebenefitsoflivingahealthylifestylebutwhatdoesthatactuallymean?Healthylivingisabouttakingresponsibilityforyourdecisionsandmakingsmarthealthchoicesfortodayandforthefuture.Ahealthylifestyleisgenerallycharacterizedasabalancedlife''inwhichonemakeswisechoices.Ahealthylifestyleisavgluableresourceforreducinghealthproblemsforrelievinglifestressandforimprovingqualityoflife. Therightnutritionisnecessarytoliveahealthylifysetyle.Yoursbodyrequiresawell﹣balanceddieteverydayinordertomaintain维持theproperamountsofvitaminsmutrientsandmineralsneededtomaintainahealthybody. Youwillneedtoincludefitnessaspartofyourlift.Physicalfietnesskeepsyourweightincheckhelpsyousleepbetteratnightpreventsheartattacksandotherhealthproblemsandgenerallylivesalongerlift.Basicallytherearesomanybenefitsofexercisingthatyoureallycan'tliveafulllifewithoutit. Emotionalstressplaysanimportantroleinmanyillnessesbothdirectlyandindirectly.Peoplearealsomorelikelytosmokeovereatdrinktoomuchworktoohardarguewithothersandsoonwhentheyarefeelingstressed.Thusstressmanagementisanimportantpartofyournewlifestyleandrelaxationtechniquesaretrulyakeypartoflivingahealthylifestyle. Beinghealthyissoimportant.Justchangeonethinginyourlifetoday.Haveahealthylifebeginningnow.Livingahealthylifestylewillbringyouhappinesshealthandthelifeofyourdreams.Youcanfeelyourbestatalltimesoftheday.
Mostpeoplearegoodatrecognizingtheuniversalfacialexpressionsofouremotions一angerjoysadnessetc.whichpresentalotofemotionalinformation.Infacttherearelessobviousfacialexpressionscalledmicro﹣expressionsMEs.Humanbeingsoftenshowthemandcommunicatetheirprivatethoughtstoothersunconsciously无意识的.What'smorepeoplecannothidethemincludingtheexperiencedones.AndMEshaveuniversality普遍性regardlessofone'sagereligionorculture. AllthefindingsleadtothepossibilitiesofMEs'wideuseindifferentfieldswherepeoplecanuseMEstounderstandotherpeople'struefeelingsthoughtsorbeliefs.PolicecanuseMEstodetectunnaturalbehavior.Teacherscanrecognizeuneaseinstudentsandgiveamorecarefulexplanation.Businessmencanuseexpressionsofhappinesstodeterminewhentheyhavegivenasuitableprice.WhenonewantstobeabletodowhatarementionedaboveitisusefultobeabletoreadMEs. HoweverMEsaredifficulttoreadbecausetheyareunconsciousandoccursometimesasfastasone﹣tenthofasecondorevenone﹣fifteenthofasecond.Atpresentevenhighlytrainedpersonsarenotalwaysabletonoticethem.Somepeopledoseesomethingthathaschangedonthefacebuttheydon'tknowexactlywhatitisthathaschanged.Sincethehumanrecognitionaccuracy精准issolowapossiblemethodforspottingMEswouldbeveryprecious. 1WhichwordcanreplacetheunderlinedworddetectinParagraph2? A.Discover. B.Show. C.Govern. D.Affect. 2WhatmakesitdifficultforpeopletoreadMEs? A.Absenceoftraining. B.MEs'shortexistence. C.MEs'universality. D.Culturaldifferences. 3Whatwillprobablybediscussedinthenextparagraphofthepassage? A.ThemeaningofMEs. B.TheimportanceofspottingMEs. C.TheapplicationofMEs. D.TheapproachtorecognizingMEs.
EveryyearinthemonthofMarchoneof1theworld'sgreatestwildlifemigrations迁徙stopsincentralNebraska.Forashorttimesandhillcranes沙丘鹤fi11thestate'swideflatfields.Thelandprovidesthebirds2withtheperfectplacetorestandeat. Sinceseveralyearsagomoreandmorepeople3havediscovereddiscoverthemigration.Visitorscrowdintoriverblinds﹣specialbuildingsthathelpkeepthebirdwatchers4hidinghidethemselves.Theylookthroughtheircamerasortelescopesinwonder. Thesandhillcranesareworththetrip.Theyare5generallygeneralalittleoverametertall.Theyhavelonglegsandnecks.Theirwingsstretchovertwometers.Sandhillcraneshavesoftgreyfeathers.They6areknownknowforhavingabrightredareaonthetopoftheirheads. ThebirdsstopinNebraskaastheymaketheirwayfromtheirwinterhomesinMexicoandsome7southernsouthpartsoftheUnitedStates.Thebirdsusuallyspendtwotothree8weeksweekatthisplace9beforetheyleave.Theyarriveinwavesattimesasmanyas400000inoneday.Theyeatinthenearbyfieldsandgrasslands.Leftovergraininsectsandsmallcreaturesgive10themtheytheenergytheyneedastheycontinuetheirtripnorthtowardCanadaandSiberia.
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AKenyanteacherwhogaveaway.mostofhismonthlysalary工资topoorpeoplehaswona﹩1﹣millionGlobalTeacherPrize. In2016PeterTabichicametoKerikoMixedDaySecondarySchoolapublicschoolinafarawayKenyasRiftValley.TheschoolhadjustasinglecomputerandhadproblemsconnectingtotheInternet.Ithadnolibraryorlaboratoiryaswell.Tomakemattersworsethestudentscamefrompoorfamilieswherebasicslikefoodandclothingwerehardtocomeby.WhilethesedifficultieswouldhavecausedmostpeopletoleavequicklyTabichistayed. Realizingthatstarvingkidsmakeforpoorstudentstheteacherbeganusingasmuchas80percentofhismonthlysalarytobuyfoodandlearningobjectsforthem.Hesetupascienceclubtogetkidsinterestedinthetopic.OurlaboratorydoesnothaveeverythingbutIencouragethemtothinkwiderandusewhatwecangetlocally. Tabichiandotherfourteachersregularlyvisitlow﹣achievingat﹣riskstudentsattheirhomestoprovideone﹣on﹣onehelpandtounderstandthedifficultiesthesechildrenfacedaily.Tabichialsoencouragesparentstoallowgirlstocontinuetheirhigh﹣schooleducation. Tabichi'seffortshavemadeadifference.Schoolregistration注册hasmorethandoubledtoalmost400nowsincehecame.In201716ofthe59graduatingstudentswenttocollegewhilein2018thenumberroseto26.In2017fivestudentsqualified有资格fortheIntelISEFInternationalScienceandEngineeringFair.Thisyeartwootherstudentswillcompeteinthe2019IntelISEFtobeheldinPhoenixArizona. Theteacherhoweyetoweshissuccesstohisstudentssaying.Iamonlyherebecauseofwhatmystudentshaveachieved.Thisprizegivesthemachance.Ittellstheworldthattheycandoanything.AswouldbeexpectedTabichiplanstospendtheprizemoneyonhisschoolcommunityandtofeedthepoor. 1WhatisthetextmainlyaboutB A.AschoollocatedinaKenya'sRiftvalleybecamefamous. B.AKenyanteacherhelpingpoorstudentswonGlobalTeacherPrize. C.AKenyanteacherhelpedgirlstocontinuetheirhigh﹣schooleducation. D.FiveKenyanstudentsqualifiedfortheIntelISEFfortheirperformance. 2WhatcanweknowaboutKerikoMixedDaySecondarySchoolD A.Ithaddozensofteachers. B.Itwasintheofacity. C.Itownedamodemlab. D.Itwasinpoorcondition 3WhichwordcanbeusedtodescribePeterTabichiC A.Honest. B.Wealthy. C.Kind. D.Humorous. 4WhichistheclosestnumberofstudentswhenPeterTabichibeganteachingthereB A.90. B.190. C.290. D.390.
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ThetriptoCanadawassofantastic!I'dliketosharewithyoutheimpressionsthiscountryleft1me﹣M﹣A﹣P﹣L﹣E. Multicultual.Canadaofficially2becomeamulticultualsocietyin1971.Canadiansbelievetheyshouldacceptothers'culturesvaluesandbeliefsequalto3theyown.Abundant富饶.Canadahasanabundanceofnaturalresources4especialfreshwaterresourcesfromnumerousriversandlakes.Pleasant.Itenjoyslotsofpleasantnaturalsceneryandbeautifulforestsinwhichtreesareextremelytallsome5measureover90metres.Livable.ThreeCanadiancities﹣VancouverTorontoandCalgaryareinthetopfivelivablecitiesintheworld.Empty.Itissuch6emptycountrywheremostofCanadianslivewithinafewhundredkilometersoftheUSAborder. Allinallthetripwas7amaze.Ifeelonetripcannothelpmepicturethewholecountry8IhopetotakeanotherculturaltriptoCanadawiththe9intendoflearningmoreaboutthiscountry.WhenI10equipwithmuchmoreinformationaboutthiscountryIcanbecomeabridgebetweentwogreatcountries﹣CanadaandChina.
WhenGlenKrugerpickedasmallcatfromananimalshelterhedidnotexpectmuch.Yetrightfromthestarteightyearsagotherewasanuncommonconnectionbetweenhimandthesmallblackcat.He1herInky. Igrewuponahundred﹣acrefarmandhadonlycats2playmatesKrugertheseventy﹣year﹣oldmansays.Myhearingwasdamagedbythe3offarmequipmentsoIlearnedtoconnectwith4.Theyreacttowhattheyseeandwhatyoudo. Inkywasagentlecat5thehousewithfiveothercats.ButonaJanuarynightin2009Inkydid6thatwouldsetherapartfrom7catsforever. Krugerhadgonedowntothebasementto8thewoodstoveforthenight.Whenhewasfinishedhe9tothetopofthestairsandreachedtoturnoffthelights.Indoingsoheslippedand10hisbackagainstanoldshelf.TheheavyshelfcamecrashingdownandsentKrugerdownthestairs. 11inapoolofbloodonthebasementfloorKrugerfelt12goingintoshock休克.Heshoutedforhelp13hiswifeBrendawasasleepintheirbedroomattheoppositeendofthehouse.14KrugernoticedInkywatchingfromthetopofthestairs. GogetBrendaKrugersaidtoInky. Inky15tothebedroomdoorandscratched16untilBrendaopenedit.ThenInkyledhertothe17.Brendafoundherhusband18thestairsandcalled911.Krugerwasrushedtothehospital.Ispentsixmonths19theresaysKruger.AlthoughIbecamelameIwasblessed.SincetheaccidentInkyhas20leftKruger'sside. 1A.gave B.named C.chose D.remembered 2A.like B.among C.except D.as 3A.sound B.noise C.alarm D.voice 4A.farmers B.friends C.animals D.neighbors 5A.visiting B.sharing C.dividing D.discovering 6A.anything B.nothing C.something D.everything 7A.familiar B.ordinary C.lovely D.outstanding 8A.shutoff B.shutout C.shutdown D.shutup 9A.marched B.flew C.struggled D.climbed 10A.hit B.bent C.shook D.pulled 11A.Falling B.Appearing C.Lying D.Thinking 12A.it B.himself C.him D.itself 13A.and B.or C.but D.so 14A.Then B.Otherwise C.Thus D.Rather 15A.ran B.walked C.returned D.withdrew 16A.rapidly B.suddenly C.madly D.urgently 17A.bedroom B.yard C.basement D.house 18A.atthebottomof B.inthemiddleof C.atthetopof D.inthefrontof 19A.regretting B.resting C.relaxing D.recovering 20A.ever B.never C.still D.already
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AlthoughtheyarealreadyintheirtwentiesorearlythirtiesagroupofyoungadultsrecentlycelebratedInternationalChildren'sDayinmuchthesamefashionasthechildrenforwhomthedayisintended.OnChildren'sDaywhenmanychildrenarespendingtimeinparkswiththeirparentsgoingtoshoppingmallstopurchasenewtoysandfeastingonexpensivedishesinfancyrestaurantssomeadultsaretakingtotheInternettodiscusshowbesttospendtheholiday.Ontianya.cnanetizennicknamed'tiger'recalledsomeofthemostpoignantmomentsfromhischildhoodinapost.'Isuggestthatwegettogethertoplaysomegamesthatwewerefamiliarwithduringourchildhoods'thepostsaid.Acampaignlaunchedbykaixin001.comapopularsocialnetworkingsiteasksyoungernetizenstopostphotostakenduringtheiryoungeryearsandshareinterestingchildhoodexperiences.Atotalof600000netizenshaveparticipatedinthecampaignupleadingabout300000photostakenduringtheirchildhoods.Manynetizenswhouploadedphotosaddedstoriestogoalongwiththeircontributions.'Mychildhoodissofarawayfrommypresentlife.HoweverIstillwanttocelebratethisdayformyselfasayoungadultfarbeyondtheageofachild'writesDongQinhao.Asa31﹣year﹣oldmanDonghastoshouldertheheavyburdensofpayingamortgage按揭andsupportinghisfamily.Dongbelievesthatrememberinghischildhoodwillboosthisconfidenceandgivehimamorepositiveoutlookonlife.1AccordingtothepassagechildrenusuallycelebrateChildren'sDaybythefollowingEXCEPT.A.goingtoparkswiththeirparentsB.buyingnewtoysinmallsC.discussingitonthenetD.dinningoutingoodrestaurants2Kaixin001.comsuggeststhatyoungernetizenscantospendChildren'sDay.A.datewiththeirsweetheartsB.asktheirbossesforadayoffC.uploadphotostakenintheirchildhoodsD.playsomefamiliargamesduringtheirchildhoods3Theunderlinedword'poignant'inthethirdparagraphmeans.A.bitterB.embarrassingC.difficultD.unforgettable4Wecanlearnfromthepassagethat.A.DongQinhaofacesgreatpressureinhislife.B.thenetizennicknamed'tiger'hatestocelebrateChildren'sDay.C.atotalof600000photoswereuploadedtokaixin001.comonChildren'sDay.D.mostyoungadultsdon'twanttosharetheirchildhoodexperienceswithothers.
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Booksnotonlyequipuswithknowledgebutalsotheybroadenourhorizons.用倒装句改写 →
Theaudiencearedressinginavarietyofwayssomeinsuitssomeinjeans.
Tensofthousandsofpeoplestarvedtodieduringthewarforlackoffood.
theywillgotoBeijinghasn'tbeendecidedyetalthoughtomorrowmaybeagoodchoice.
短文中共有10处错误错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏词符号∧并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词的下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. NowletmeintroduceourEnglishpapertoyou.Onmyopinionthepaperisveryimportancetoourstudy.WecanimproveourEnglishespeciallywritingEnglishbyreadingit.Secondlyit'saveryinterestingtoreaditwhichmadeourafter﹣classtimemeaningfulandcolorful.What'smorethereisalotofcolumnsinourpapersuchSchoolNewsTeachers'AdviceandStudents'Voice.Itnotonlymakesuslearntheimportanteventsandalsohelpsuscommunicatingwithteachers.Wecantaketheadvicesfromourteachers.InawordIlikeourEnglishpaperverymuch.
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