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若变量x，y满足约束条件，则的最大值为（ ）
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若变量xy满足约束条件则w=4x•2y的最大值是__________
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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.
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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同的增加删除或修改. 增加在缺词处加一个漏字符号Ʌ并在其下面写出该加的词. 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. ThenewschoolyearisaroundcornersoIneedtobuysomethingtomychildrenandmyself.Thereforeyesterday'safternoonItookthemtoashoestoretobuyingsomenewshoes.Myyoungestkidswantedapairofsportsshoesandthusweboughtonepair.Myoldersonneededapairofcasualshoesforschool.andwewerefoundsomeonsale.Thefirstpairwhichhetriedonwasalittlesmall.soheputonotherpair.andtheyfittedhimperfectly.Mydaughterwantedbeautydressshoesandshegotsomehighheels.Imyselfboughtsomebootsbecausemyoldoneswerewearingout.
在“要致富先修路”的思想指导下近几年云南的交通有了快速的变化特别是“高铁网络”延伸到云南以后许多地区的经济和旅游发生了翻天覆地的变化高铁列车也成为人们外出旅行的重要交通工具．假期里小明和爸爸从昆明到某地去旅游从昆明到该地乘汽车行驶的路程约为800km高铁列车比汽车行驶的路程少50km高铁列车比汽车行驶的时间少5h．已知高铁列车的平均时速是汽车平均时速的2.5倍求高铁列车的平均时速．
体育节中某学校组织九年级学生举行定点投篮比赛要求每班选派10名队员参加．下面是一班和二班参赛队员定点投篮比赛成绩的折线统计图每人投篮10次每投中1次记1分请根据图中信息判断 ①二班学生比一班学生的成绩稳定 ②两班学生成绩的中位数相同 ③两班学生成绩的众数相同． 上述说法中正确的序号是
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1|1﹣|+3tan30°﹣﹣50﹣﹣﹣1 2化简分式÷并从1234这四个数中取一个合适的数作为x的值代入求值．
如图AB∥CDAD与BC相交于点OCD＝3ABS△ODC＝60则S△OAB＝．
大理古城简称榆城位居风光亮丽的苍山脚下是全国首批历史文化名城之一．它东临洱海西枕苍山城楼雄伟风光优美引来无数旅客前来观光．“十一”期间相关部门对到大理观光的游客的出行方式进行了随机抽样调查整理绘制了两幅统计图尚不完整根据图中信息下列结论错误的是
解不等式组．
如图矩形OABC的顶点O与坐标原点重合顶点AC分别在坐标轴上B42过点D03和E60的直线分别与ABBC交于点MN． 1直接写出直线DE的解析式 2若反比例函数y＝x＞0的图象与直线MN有且只有一个公共点求m的值 3在分别过MB的双曲线y＝x＞0上是否分别存在点FG使得BMFG构成平行四边形若存在则求出F点坐标若不存在则说明理由．
有理数abc在数轴上的对应点的位置如图所示则正确的结论是
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Pictureaniceberg冰山.You'llprobablyimaginesomethingwhiteassnowrisingupoutofabluesea.Buticebergscanbeallsortsofshades.Theycanbefromafrostybluetoanattractivegreen. Researchersandsailorshaveobservedemerald翠绿色icebergsforyears.Alargepieceoficemast﹣highandgreenasemeraldevenappearsinSamuelTaylorColeridge's1834poem.Buttheyhaven'tfoundoutexactlywhytheseicebergslookthewaytheydo. AnewpaperledbyStephenWarrenwaspublished.Itallhastodowithwhaticebergsaremadeoutof.Icebergsbreakoffglaciers冰川oriceshelveswhichhappensmainlyaroundAntarcticaandGreenland.Theybegintheirlivesassnowfallthataccumulatesovertime.So.icebergscontainairpocketswiththeformofbubblesthatspreadlight.Withsomeexceptionsandrarelinesglaciericetendstolookbluishwhite. AtfirstWarrenguessedthatthegreenwasaproductofmeltcarbon.Anditcamefromrottingplantsorseaanimals.Butsamples样本didn'tproveit.AnotherideastartedtotakeshapeaftertheyhadfoundahighconcentrationofironinasampleofseaicefromtheAmeryIceShelf. Whenglaciersrubacrosslandtheyproducewhat'sknownasglacierflour.Itisaproductofbedrockbeinggroundclownbythemovingmass.Asglaciersmoveawaytheseremainsareusuallywashedoutintowater.inparticlessometimestoosmalltobenoticeabletoyoureyes.Butonland.soilandrockscontainironoxidesthatoftenhaverosycolors.likeredsyellowsandbrowns﹣andsincetheseaicecontained500timesmoreironthantheglaciericeWarrenwonderedwhethertheremainswereresponsibleforicebergstakingonagreenappearance. Hedoesn'tknowforsure.He'shopingtosecuremoneysothathecanreturntotheareaandstudytheicebergsthemselves. 1WhyisSamuelTaylorColeridge'spoemmentionedinthetext? A.Ittellswhyicebergslookthewaytheydo. B.Itdescribesvividlywhaticebergsarelike. C.Itsayscausesoftheappearanceoficebergs. D.Itprovestheexistenceofcolorfulicebergs. 2WhatcanweknowaboutStephenWarren'spaper? A.Itdrawsonresearchers'andsailors'views. B.Itistherecordofthemovementoficebergs. C.Ittalksabouthowicebergscomeintobeing. D.Itisacollectionofvarioussocialphenomena. 3Whatdoestheunderlinedworditinparagraph4referto? A.Asampleofseaice. B.Warren'sfirstguess. C.Warren'sideaoniron. D.Aproductofmeltcarbon. 4Whatisparagraph5mainlyabout? A.Thepossiblereasonwhyicebergslookgreen. B.Wheremostoficebergseventuallydisappear. C.Howicebergstakeinthecolorsfromglaciers. D.Thewayinwhichicebergsbreaksoffglaciers.
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DutchdesignerDaanRoosegaardehasspentmuchofhistimeseekingartisticsolutions解决方案tosolveourenvironmentalproblems.HispastprojectsincludeBioluminescent生物发光TreestolightstreetsaSmog﹣FreeTowertocleanBeijing'spollutedair.andGatesofLight.whichusestheheadlampsofpassingcarstolightupthe60floodgatesoftheAfsluitdijkamajordamintheNetherlands.Nowheishopingtousehisskillstosolveapressingglobalproblem﹣spacejunk! Scientistsguessthatthereareover500000bitsoflargerubbish.TodealwiththeproblemRoosegaardeintendstoachievehisgoalbyeducatingthepublicabouttheneedofthesituationandcomingupwithpossiblesolutions.Theplan.calledtheSpaceWasteLab.startedinOctober2018withalaser激光showintheNetherlands.TheuniqueoutdoorartworkofLEDsusedreal﹣timetrackinginformationtopointatpiecesofspacejunkfloatingataltitudesof200to20000kilometers.Theexperiencewasdesignedtomakethepublicknowmoreabouthowmuchspacejunkthereare. Tofindasolutionthedesignerhasbeenthinkingwithexperts.OneoftheprojectsbeingconsideredisShootingStarswhichattemptstoreintroducethetrashtotheatmosphereinacontrolledway.Uponreentry.thewastewouldburnintheatmospherelikeashootingstar.Roosegaardeenvisagesthatifsuccessful.burningspacetrashcouldsomedayreplacefireworksatlargepublicevents! InSeptember2018.theRemoveDEBRISsatellitesuccessfullysentanettocatchatargetwhileorbitingatanaltitudeofabout300kilometers190miles.Sometimethisyear.thecapsulewillsetfreeaharpoonthathasbeendesignedtoremovespacetrash.AttheendofitstaskRemoveDEBRISwillletgoasailtobringthesatelliteitself.and.hopefullysometrashbackintotheatmosphere.whereitwillburnup. 1WhatcanweinferaboutDaanRoosegaarde? A.Heistooaggressivetoputforwardgoodplans. B.Heiscreativeinsolvingenvironmentalproblems. C.Heisfondofspendingallofhistimeseekingartskills. D.Heissensitivetoartreflectedinenvironmentalprojects. 2WhywasalasershowheldinOctober2018? A.Toconfirmreal﹣timeinformationaboutspacetrash. B.ToshowthegreatbeautyofLEDtocommonpeople. C.Toraisepublicawarenessoftheamountofspacetrash. D.Toinspirepeopletoconsiderthesolutiontospacetrash. 3Whatdoestheunderlinedwordenvisageinparagraph3probablymean? A.Suspect. B.Demand. C.Advise. D.Imagine. 4Whatisthefunctionofasail? A.Bringingthesatellitetoatmospheretoburn. B.Keepingtrashtravelingalongitsownorbit. C.Takingthesatelliteawayfromatmosphere. D.Removingspacetrashoutofthecapsule.
AfewyearsagomywifeandItookatriptoCostaRica.Uponarrivalwe1acarandheadedouttoourfirstdestinationwhichwasafewhoursaway.Ihada2soIfiguredI'dbeingreatcondition.About20minutesintothedriveIfoundmyselfpractically3intheunmarkedstreetsanddirtyroads.Upset.IturnedtoSiriavirtual虚拟的assistantinmyphoneforhelp. Itypedthe4toourdestinationinmyphoneandinstantlySirihad5thebestroute路线togetthereandwewereonourway. Theonly6wasthatthingsdidn'talwaysgothewayIthoughttheywould.Withthestreetsnotbeingwell7Iwouldsometimesmissaturnandheadinthe8direction.LuckilySirinevergot9withme.AnytimeImissedaturnSiriwouldsimply10andsayRecalculatingroute.11route.AndwithinafewsecondsSiriwouldhaveanewroute12togetustoourdestination. SometimesthenewroutemeantIhadto13totherightturnandsometimesshefoundadifferentroutethattookmynewlocationinto14Eventuallywemadeittoourhotel15andenjoyedsomebeautifulsceneryalongtheway. Mostpeoplemakethe16ofthinkingthatsuccessandhappinesscomefromsomeonesettingagoalandthen17straighttowardsit.The18isthatthereisnostraightpathtosuccess.Thereisn'teventhe19path.Therearemanypathsthatcangetyoutoyourgoals.Youjusthavetobe20torecalculateyourroutewhenyoumissaturnorthereissomethinginyourway. 1A.produced B.repaired C.rented D.purchased 2A.car B.phone C.compass D.map 3A.absorbed B.lost C.experienced D.free 4A.address B.approach C.receipt D.schedule 5A.polished B.discovered C.opened D.managed 6A.fear B.difference C.sympathy D.problem 7A.marked B.paved C.arranged D.expanded 8A.illegal B.new C.wrong D.potential 9A.generous B.mad C.concerned D.cautious 10A.breakdown B.cutin C.getup D.goaway 11AAbandoning B.Cancelling C.Reaching D.Changing 12A.checked B.updated C.adjusted D.planned 13A.point B.lead C.return D.apply 14A.order B.direction C.account D.place 15A.safely B.frequently C.hungrily D.gradually 16A.mistake B.excuse C.accident D.trouble 17A.accumulating B.withdrawing C.marching D.fleeing 18A.answer B.truth C.condition D.privilege 19A.first B.suitable C.accurate D.only 20A.willing B.proud C.anxious D.ambitious
今年是我市全面推进中小学校“社会主义核心价值观”教育年．某校对全校学生进行了中期检测评价检测结果分为A优秀B良好C合格D不合格四个等级．并随机抽取若干名学生的检测结果作为样本进行数据处理制作了如下所示不完整的统计表和统计图． 请根据图提供的信息解答下列问题 1本次随机抽取的样本容量为 2a＝b＝ 3请在图2中补全条形统计图 4若该校共有学生800人据此估算该校学生在本次检测中达到“A优秀”等级的学生人数为人．
某校计划修建一个既是轴对称图形又是中心对称图形的花坛从学生中征集到设计方案有等腰三角形正五边形正六边形平行四边形菱形矩形圆等图案你认为符合条件的有几种
如图是由5个相同的小正方体组成的立体图形这个立体图形的左视图是
如图反比例函数y＝图象与直线y＝﹣x交于AB两点将双曲线右半支沿射线AB方向平移与左半支交于CD．点A到达A′点A′B＝BOCE＝6则k＝．
计算|﹣2019|＝．
下列计算正确的是
a﹣＝3则a2+＝．
如图AB是⊙O的直径且AB＝6．点C是⊙O上的一动点连接ACBC在AC的延长线上取一点D使得∠CBD＝∠DAB点G为DB的中点点E为BG的中点连接AE交BC于点F． 1试判断直线BD与⊙O的位置关系并说明理由 2当∠CGB＝60°时求的长 3当AE∥CG时连接GF若AF＝4求BD的长．
函数y＝中自变量x的取值范围是
如图12是放置一个水管三叉接头若从正面看这个接头时看到图形如图2所示则从上面看这个接头时看到的图形是
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