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Wellbe.Ittakestime.I'msureitwillwork.
若与都是二次根式则=．
Hehadalongtelephonec withhisteacheryesterday.
用如图的装置演示气体扩散现象其中一瓶装有密度比空气大的红棕色二氧化氮气体另一瓶装有空气．1为了有力地证明气体发生扩散装二氧化氮气体的应是选填A或B瓶．2若实验温度分别为①0℃②4℃③20℃④30℃．则在温度下填序号气体扩散最快．
已知|a-1|+=0则a²+b²=．
﹣27的立方根与的平方根的和是A．0 B．6 C．0或-6 D．-6
²=
Themuchyoureadthefasteryouwillbe.
判断下列各式哪些是二次根式x＞0x≥0y≥0．
如图在同一直角坐标系中二次函数的图象与两坐标轴分别交于A﹣10点B30和点C0﹣3一次函数的图象与抛物线交于BC两点．1一次函数的解析式为2当自变量x时两函数的函数值都随x增大而增大．3当自变量时一次函数值大于二次函数值．4当自变量x时两函数的函数值的积小于0．
x是怎样的实数时式子有意义
计算²=
=
若求a2009+b2009的值．
它的确提高了我说的技能.Itreally my.
=
计算=
若|2009-a|+=a求a-2009²的值．
如图图①是一个铁丝圈中间松松地系一根棉线图②是浸过肥皂水并附着肥皂液薄膜的铁丝圈图③表示用手轻轻地碰一下棉线的任意一侧图④表示这一侧的肥皂液薄膜破了棉线被拉向了另一侧这个实验说明了
=
30分JohnnyandIlivedinasmallneighborhoodin1955.Wehadboughtourtwoyoungsonstwo1forChristmasandJohnnywouldassemblethemonChristmasEve. ButonChristmasEvedayJohnny2togotoBrookleyAirForceBaseinMobiletorepairajet.Ihadmyhands3withflourpreparingforChristmasdinnerand4twoenergeticboys. Iwasmakingthechocolatecakewhenan5knockedonthedoor.ItwasBeatricewhowasthe6persononourroadwithatelephone.Thebasehad7tosaythataheavytorquewrench扭矩扳手hadcomeapartinJohnny'shandmakingthehone8.Mysister﹣in﹣lawRuthandherhusbandOttotookmetothe9whilemymother﹣in﹣lawstayedwiththechildren. Wegotthereonlyto10Johnnywithacastonhisarmeagertogethomealthoughthedoctorrequiredthathe11.ItwasChristmasEveJohnny12andhehadbikestoassembleforhisboys.Thedoctorsaidhe'dconsider13himthenextmorningifJohnnycouldfindsomeonetodrivehimhome. OnChristmasmorningJohnnytriedcallingthemotorpool车辆调配所.Theysaid14mustcomefromhigherupsoJohnny15makingcalls.16abigbluecarrolleduptothehospitalaskingforthemanwhoneededa17home. Johnny'smotherandIwereputtingdinneronthetablewhenweheardthecar.Wewere18toseeJohnny.WithOtto'shelpJohnnyassembledtheboys'gifts. ThatcoldChristmasDayourheartswerefullof19forthosewhohadgonetheextramiletobringus20ontheholiday. 1A.cars B.bicycles C.phones D.toys 2A.asked B.refused C.had D.used 3A.full B.decorated C.related D.familiar 4A.searchingfor B.playingwith C.worryingabout D.lookingafter 5A.stranger B.engineer C.operator D.neighbor 6A.last B.right C.only D.first 7A.paused B.called C.decided D.intended 8A.broken B.dirty C.ugly D.abandoned 9A.base B.hospital C.destination D.station 10A.find B.supply C.assist D.equip 11A.leave B.rest C.stay D.relax 12A.believed B.imagined C.expected D.argued 13A.admiring B.dismissing C.rewarding D.assessing 14A.ideas B.demands C.orders D.policies 15A.started B.tried C.kept D.stopped 16A.Suddenly B.Finally C.Instantly D.Gradually 17A.lift B.recipe C.trip D.voyage 18A.thrilled B.embarrassed C.motivated D.terrified 19A.generosity B.consideration C.kindness D.appreciation 20A.close B.apart C.around D.together
如图是二次函数y1=ax²+bx+c和一次函数y2=mx+n的图象观察图象写出y1≥y2时x的取值范围．
10分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. Iamalwaystellingtoworkhardtohaveagoodlifeinthefuture.HoweverIdomybesttoplaybasketballandstudy.IwanttobebasketballplayerwhenIwillgrowup.Torealizemydreams.Ipracticeplayingbasketballregularlyaimingtomakemybestshots.AlthoughI'minterestinginwatchingTVImanagetofinishmyhomeworkfirst.ItrymybestinallthetestsespecialinthemathtestbecauseIfindmathmoredifficultythananyothersubject.AnywayIwillsparenoeffortsandnevergiveinonmystudiesandIbelieveifIamsuretosucceed.
8分Humanshavealwaysconsideredthemselvesspecialcomparedwithotheranimals.Onereasonisthecomplexityofourlanguage﹣boundedbyuniquerulessuchassyntaxwherewestringwordstogetherinaspecificordertocreatemeaningfulsentences.Butitturnsoutabirdmayalsovocalize发声withsyntaxrules. TheJapanesegreattitisabirdthat'sacloserelativeofNorthAmerica'sveryownchickadee.ToshitakaSuzukiofJapan'sGraduateUniversityforAdvancedStudieshasbeenlisteningtothecallsoftheJapanesegreattitforthepastdecade.Suzukihasrecordedatleasttentypesofalarmcallsusedbythebird.OneofthoseisknownastheABCcallwhichwarnsothergreattitsofthepresenceofapredator捕食者andanotheristheDcallwhichsignalsthebirdstoapproachthecaller. NowSuzukiandhiscolleagueshavefoundthatthegreattitusesthosecallstogethertodeliverbothmessagestootherbirds.Andtheyfoundthattheorderofthatcallwasvital﹣onlyABC﹣Dcallmadesensetothebirds.WhenthescientistsintentionallychangedtheordertocreateaD﹣ABCcallthebirdsdidnotrespond.ThestudyispublishedinthejournalNatureCommunications. IthinkthereallyinterestingthingiswhytheordermattersandfiguringthatoutIthinkwillbedifficultbutalsopotentiallyreallyreallyinterestingbecauseit'llgivealotofdeepunderstanding…saidDavidWheatcroftofSweden'sUppsalaUniversityamemberofthestudyscientists.Youwouldn'texpectthatitwouldmatter.Obviouslyitmattersinhumanlanguagetheorderinwhichwesaythingsbutit'sstillsomehowamazingwhenyoufinditinbirds.SoIthinkunderstandingwhyit'sthecasewillbereallyinterestinginthefuture Theworkcouldhelpexplaintheevolutionofthebuildingblocksandstructure结构ofourownlanguage. 1What'sthemajorfunctionofparagraph1? A.Toshowlanguagedifferencestoreaders. B.Totellacommonlyacceptedbelieftoreaders. C.Tointroducethebackgroundofthewholetext. D.Toraisereaders'interestinthefollowingtext. 2WhydidthebirdsmakenoresponsetoD﹣ABCcall? A.Itfailedtomakeanysense. B.Itwasfarbeyondtheirlevel. C.Theyfounditbarelynatural. D.Theywereafraidofscientists. 3WhatcanweknowaccordingtoDavidWheatcroft'swords? A.Hespeakspositivelyofthediscoverythatthesoundorderexistsinbirds. B.Scientistshavealreadyunderstoodthereasonwhytheordermatters. C.Theorderdiscoveredinbirdsisasobviousasinhumanlanguage. D.Hethinksscientistslookfortheorderinbirdsforentertainment. 4Whatisthebesttitleforthetext? A.Birds'SoundMakesThemSurvive B.BirdsHelpMan'sLanguagetoEvolve C.BirdsCombineCallsinaSpecificOrder D.Birds'LanguageisDifferentFromMan's
100的平方根是
利用二次函数图象的草图求出下列不等式的解集要求在画出草图．2x²+4x-6＞0
²=
=
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