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对下列多项式进行分解因式：2x（a-b）+3y（b-a）
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已知多项式x4+2x3-x+m能因式分解且有一个因式为x-1.1当x=1时求多项式x4+2x3-x+
我们已经学过将一个多项式分解因式的方法有提公因式法和运用公式法其实分解因式的方法还有分组分解法拆项法
下列各式中与多项式2x﹣﹣3y﹣4z相等的是
2x+（﹣3y+4z）
2x+（3y﹣4z）
2x+（﹣3y﹣4z）
2x+（3y+4z）
下列多项式相乘能用平方差公式的是
（x﹣y）（y﹣x）
（2x﹣3y）（﹣2x+3y）
（x﹣y﹣z）（﹣x+y+z）
（x﹣3y）（﹣x﹣3y）
如果多项式2x2﹣3kx+1能分解因式其结果是2x+1x+1则k=__________.
下列各式中与多项式2x﹣﹣3y﹣4z相等的是
2x+（﹣3y+4z）
2x+（3y﹣4z）
2x+（﹣3y﹣4z）
2x+（3y+4z）
把多项式2x2﹣8分解因式得.
一个多项式减去x2﹣3y2等于x2+2y2则这个多项式是
﹣2x
2
+y
2
2x
2
﹣y
2
x
2
﹣2y
2
﹣2x
2
﹣y
2
分解因式2xa－2＋3y2－a=___________.
【问题提出】分解因式12x2+2xy﹣3x﹣3y2a2﹣b2+4a﹣4b【问题探究】某数学探究学习小
把多项式2x2y﹣4xy2+2y3分解因式的结果是.
下列多项式乘法计算题中不能用平方差公式计算的是
（2x﹣3y）（2x+3y）
（2x﹣3y）（﹣2x+3y）
（2x﹣3y）（﹣2x﹣3y）
（﹣2x+3y）（2x+3y）
下面是某同学对多项式x2﹣4x﹣3x2﹣4x+1+4进行因式分解的过程.解设x2﹣4x=y原式=y﹣
给出三个多项式X=2a2＋3ab＋b2Y=3a2＋3abZ=a2＋ab请你任选两个进行加或减法运算再
下列多项式能进行因式分解的是.
x
2
－y
x
2
＋1
x
2
＋y＋y
2
x
2
－4x＋4
对下列多项式进行因式分解2xa+b+3ya+b
下面是某同学对多项式x2－4x+2x2－4x+6+4进行因式分解的过程.解设x2－4x=y原式=y+
下面是某同学对多项式x2－4x+2x2－4x+6+4进行因式分解的过程.解设x2－4x=y原式=y+
把多项式2x2﹣8分解因式得.
把多项式2x2﹣4xy+2y2因式分解的结果为.
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25分假如你是拉萨中学高中二年级的一名学生你在学校组织了一项考场卫生状况的调查活动.请用英语给校报编辑写一封信反映相关情况.内容包括调查结果持相应想法的理由及你对调查结果的看法. 注意1.信的开头和结尾已经给出但不计入总词数 2.词数为100﹣120. DearEditor IamaSeniorTwostudentXXX.RecentlyIhavecarriedoutasurvey﹣﹣﹣Thehealthstatusinexaminationroom.Theresultsareasfollows. Yourssincerely XXX.
1分We感激youreffortsforthedevelopmentofthecompany.
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8分 AttentionTimHortons StainlessSteelTravelMugOwners LidRecall﹣15ozStainlessSteelTravelMug Afaultatthecuphasbeenrecognized.Thefaultmayresultinsomelidsliftingslightlyfromthebodyofthemugandcouldprobablycauseinjuryfromhotliquidleaking.Thereforewehavegivenanimmediatelidrecallnotice. ThisRecallnoticeisrelatedonlytoTimHortons15ozStainlessSteelTravelMugssoldbetweenOctober2002andJanuary2003.Thebottomofthemugisstampedwithdistributor's经销商nameThermoServ.Thereisnoprintingonthehandleofthemug. AtTimHortonswevalueourcustomers'safetyaboveanythingelse.SowhetheryourlidisleakingornotintheinterestofyoursafetywearerequestingthatyoubringyourmugtoyournearestTimHortonsexcludingEssoTimHortonswheretheywillexchangethelidforanewlidthatfitssafety.ThenewlidswillbeavailableFebruary12003pleasedonotuseyourmuguntilyouexchangethelid. Here'swhatyoudo *Pleasedonotuseyourmuguntilyouhaveexchangedthelidforanewone. *NewlidswillbeavailableFebruary12003. *ReturnyourtravelmugtoaTimHortonsstoreasofFebruary12003. *Yourlidwillheexchangedforanewlid. Ifyouprefertoreturntheentiremugbringitbackatanytimeforafullrepayment. Ifyouhaveanyquestionsregardingthisrecallpleasecontactusat TollFreeNumber1﹣888﹣601﹣1616 830am﹣500pmEasternStandardTime TimHortons 1.Thisadvertisementistryingto. A.introduceanewtypeofmugs B.persuadepeopletobuyanewlid C.informpeopleofexchangingalid D.warnagainstthedangerofusingthemug 2.Theadvertisementismainlyaimedatthosewho. A.oftentravelaround B.have15ozStainlessmugs C.wanttobuy15ozstainlessmugs D.aresellingthemugs 3.AccordingtotheadvertisementwhichofthefollowingstatementsisNOTtrue? A.Peopleshouldstopusingthemugimmediately. B.Peoplecangetthemoneybackiftheyreturnthemug. C.Peoplewithquestionscancallthecompanyfreeofcharge. D.PeoplecanreturnthelidbetweenOctober2002andJanuary2003. 4.FromthepassagewecanlearnthatTimHortons. A.isaclubfortravelers B.wantstomakemoremoney C.caresaboutthecustomers'safety D.isanorganizationhelpingcustomers
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10分Mr.Briggsgotajobwithaninsurancecompany保险公司afterheleftschoolandwentaroundvisitingpeopleintheirhomestosellthemlifeinsurance.OnedayafterhehadbeenworkingforthecompanyforaboutayeartheinsurancemanagersentforhimandsaidMr.BriggsIhavebeenlookingatyourrecordasasalesmanwithourcompanyandthereisonethingthatsurprisesmeaboutit.Whyhaveyoubeensellinginsuranceonlytopeopleover95yearsoldandwhyhaveyoubeengivingthemsuchgenerous宽厚的conditions?You'llruinourcompanyifyougoonlikethat. OhnosiransweredMr.BriggsatonceBeforeIstartedworkIlookedatthefigures数字fordeathsinthiscountryduringthepasttenyearsandIcantellyouthatfewpeopledieattheageof95. 1.BeforeheworkedinaninsurancecompanywhatwasMr.Briggs? A.Hewasastudent. B.Hewasanofficial. C.Hewasaworker. D.Hewasabusinessman. 2.Thewordruininthefirstparagraphmeans. A.lose B.destroy C.leave D.break 3.AsasalesmanwiththecompanyMr.Brigs. A.visitedpeopletoaskthemtoworkwithhim B.calledonpeopletomakethemjointhecompany C.sawoldpeopleinordertohelpthem D.visitedmanypeoplesoastoofferinsurance 4.Whatwasitthatsurprisedthemanager? A.Mr.Briggssoldlifeinsuranceonlyto95people. B.Mr.Briggssoldinsuranceonlytopeopleofmorethan95. C.Mr.Briggshadruinedtheinsurancecompany. D.Mr.Briggsgavepeoplegenerousconditions. 5.Whichofthefollowingistrueaccordingtothepassage? A.Mr.Briggshadstudiedthefiguresfordeathsforseveralyears. B.Mr.Briggsbegantolookatthefiguresafterhestartedwork. C.Agreatnumberofveryoldpeopledieeveryyear. D.Thenumberoftheveryoldpeoplewhodiedeveryyearissmall.
8分Irisscan虹膜扫描pleasethebank'scomputervoicetellsyou.Youstepupandthecomputerreadsyoureyecomparingittothestoredfileithasofyouriris.Theimageshadbettermatch﹣otherwiseyouwon'tbeabletogetyourmoney. Irisscanningandothertechnologiessuchasfingerprintandvoicescanninghaveappearedinmanysciencefictionmoviesinthepast.Todaytheseadvancedtechnologiesarepartoftherealworld.Theyarecommonatworkthebanktheairportandyourlocalprison.Theirisscanfingerprintscanandvoicescanareallexamplesofbiometrics生物测定学afastdevelopingareaofautomaticpersonalidentificationtechnology.Basicallybiometricsusesvariouswaystoverifyapersonsidentitybasedontheindividual'suniquecharacteristicsincludingfingerprintsvoicesirisesbodyheatpatternsfacialimageshandprintssignaturesandsoon. Biometricsidentificationsystemshaveanumberofadvantagesoverpasswordsystems.Theprimaryadvantageisthatanindividualhastobephysicallypresentinordertobeidentified.Anotherimportantadvantageisthattherearenopasswordstorememberforgetloseorsteal. Thevoicescanisthesimplestandmostaffordableformofbiometrics.Itonlyrequiresacomputeramicrophoneandthecorrectsoftware.Thesoftwarerecordsasubject'svoiceandthencomparesittoastoredvoicesampleforidentificationpurposes. Foradditionalsafetyfingerprintandhandprintscanscanalsobeemployed.Fingerprintscanstaketheimageofafingerprintandcompareittoastoredfileofprints.Handprintscansidentifytheuniquefeaturesofahand. Irisscanscurrentlygivethehighestlevelofaccuracyamongalltheavailablebiometricssystems.Anothertechnologyfullfacialscansiscurrentlyinuseatbordercrossingsandairports.Facialscanningequipmentcanactuallytrackandidentifymovingfaceswithinacrowd. Thepotentialofbiometricsisexcitingandencouraging.Withcontinueddevelopmenttestingandapplicationcurrenttechnologieswillbecomeevenmoreeffectiveinthefuture.Soonthedaysofpasswordandcarkeyswillbegone.Justdon'tleavehomewithoutyourfingerprints! 29.Thefirstparagraphservesasan. A.conclusionB.explanationC.commentD.example 30.TheunderlinedwordverifyinParagraph2probablymeans. A.changeB.confirmC.developD.protect 31.Whichisthemostaccurateformofbiometrics? A.TheirisscanB.ThefingerprintscanC.ThevoicescanD.Thefacialscan 32.Whatistheauthor'sattitudetowardsthefutureofbiometrics? A.Heisuncertainaboutit. B.Hefeelsdoubtfulaboutit. C.Hefeelshopefulaboutit. D.Heisworriedaboutit.
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以下为甲状腺激素的细胞内作用机制示意图请回答相关问题 1人处于寒冷环境中时甲状腺的活动填加强减弱或不变．由图推测甲状腺激素的受体在其直接调节的是过程最终使产热增加． 2研究表明甲状腺激素可促进小肠黏膜对葡萄糖的吸收促进糖原分解及非糖物质转化为葡萄糖那么甲状腺激素在调节血糖平衡的过程中与胰岛素的关系是．糖尿病患者每天的排尿量明显多于正常人在进食含较多淀粉的食物30分钟以后糖尿病患者体内的抗利尿激素如何变化填升高降低或无明显变化． 3甲状腺的审理活动受植物性神经的控制甲状腺以及支配它的神经末梢属于反射弧中的轴突末梢释放的肾上腺素和去甲肾上腺素属于．
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如图中abcd分别表示人的生殖周期中不同的生理过程．下列说法正确的是
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进食可刺激小肠K细胞分泌多肽GIPGIP可作用于胰岛细胞和脂肪细胞其作用机制如图所示1～4代表细胞膜上的结构． 1K细胞合成GIP的原料是． 2图中结构1～4是细胞膜上的其化学成分是．进食后GIP和胰岛素通过结构12作用于脂肪细胞促进从而降低血糖水平．血糖浓度过低时分泌增加与胰岛素相互作用共同维持血糖含量的相对稳定． 3给大鼠口服或静脉注射适量葡萄糖让二者血糖浓度变化相当．与注射相比口服后血浆胰岛素水平更其原因是． 4现有甲乙两个糖尿病患者甲体内检测出能作用于结构2的抗体此抗体还可作用于肝细胞和肌细胞等细胞表面的结构2乙体内检测出能作用于结构3的抗体．患者的抗体是由细胞产生的这两种糖尿病都属于病两个患者中通过注射胰岛素能有效控制血糖浓度的是．
下列与生活密切相关的化学知识中说法正确的是
30分 TheBlindBoy Ablindboysatonthestepsofabuildingwithahatbyhisfeet.Heheldupa1whichsaidIamblindpleasehelp.Therewereonlyafew2inthehat. Amanwaswalkingby.Hetookafewcoinsfromhis3anddroppedthemintothehat.He4tookthesignturneditaroundandwrotesomewords.He5thesign6everyonewhowalkedbywouldseethenewwords. Soonthehatbeganto7.Alotmorepeopleweregivingmoneytotheblindboy. Thatafternoonthemanwhohad8thesigncametosee9thingswere.Theboy10hisfootstepsandaskedWereyoutheonewhochangedmysignthismorning?Whatdidyouwrite? ThemansaidIonlywrotethetruth.Isaidwhatyousaidinadifferentway11.WhathehadwrittenwasTodayisan12dayandIcannotseeit. Doyouthinkthefirstsignandthesecondsignweresayingthesamething? 13bothsignstoldpeopletheboywasblind.Butthefirstsignsimplysaidtheboywasblind.Thesecondsigntoldpeopletheywereso14thattheywerenotblind. Shouldwebesurprisedthatthesecondsignwasmore15? Bethankfulforwhatyouhave.16lifegivesyoua100reasonstocryshowlifethatyouhave1000reasonsto17.Faceyourpastwithoutregret.18yourpresentwithconfidence自信.Prepareforthe19withoutfear.Keepthefaithand20thefear. 1.A.cover B.sign C.board D.note 2.A.cashes B.treasures C.pennies D.coins 3.A.pocket B.can C.backpack D.case 4.A.still B.then C.already D.yet 5.A.puton B.putout C.putoff D.putback 6.A.incase B.nowthat C.sothat D.asthough 7.A.mixup B.showup C.fillup D.makeup 8.A.changed B.prepared C.supported D.reached 9.A.what B.why C.where D.how 10.A.realized B.recognized C.found D.discovered 11.A.though B.but C.yet D.still 12.A.average B.successful C.harmonious D.beautiful 13.A.Afterall B.Inthelongterm C.Ofcourse D.Asamatteroffact 14.A.happy B.disappointed C.lucky D.strange 15.A.effective B.brave C.surprising D.scientific 16.A.Once B.When C.Until D.Because 17.A.smile B.exist C.survive D.prove 18.A.Lookinto B.Searchfor C.Dealwith D.Dependon 19.A.tomorrow B.adventure C.future D.sunrise 20.A.preserve B.charge C.skip D.drop
6分ItwasshortlybeforemidnightandDr.Patriciawasgettingreadyforbed.Thephonerang.Ontheotherendofthelinewasawomanabouttobreakapromise. Thewomanwashermother'sneighbor.FloraHarrishadmadetheneighborswear发誓shewouldn'ttellherdaughtershe'dhadaheartattackandwasinthehospitalforfearherdaughterwouldworry.Theneighborwiselydecidedtodisobeyorders. Harrisdesperatelywantedtogettothehospitalimmediatelybutshecouldn't.ShelivesinWashingtonD.C.andhermotherlivesinCalifornia. ForthepastyearandahalfHarrishasgonetoLosAngeleseveryothermonthtotakecareofhermother.FloraHarristakescareofherhusbandJameswho's91andhasAlzheimer'sdisease.Theyliveintheirownhomeandcaregivercomestohelpthemafewhoursaday. HarrisisoneofmanyAmericansfacingtheheartacheofhowtotakecareofagingparentsfromafar.She'softenworriednottomentionextremelybusywithademandingjobtwoteenagedaughtersandthefrequenttripstoCalifornia. InsomewaysHarrisisluckyShehastheresourcestomakethetripstoLosAngeles.PlusHarrisisadoctorwhotreatstheelderly. Butit'sstilltoughshesays.Icanforeseewhatthenextfewyearsaregoingtolooklikeandit'snotaprettypicture.Myfather'sgoingtoneeddiapers尿布.Therewillcomeatimewhenhewon'trecognizemeandhe'seasilyexcited.Iworryhe'sgoingtobeviolentandhurtmymother. Sowhatdoyoudowhenyouliveacontinentawayfromyouragingsickparents?Therearenomagicanswers.Youcanhiresomeonetohelpbutyoucan'toutsourceitcompletely. 1.Whywasthewomanthoughttohavebrokenapromise? A.ShefailedtotakecareofFlora. B.ShewasnotsupposedtocallHarrisatmidnight. C.Shecouldn'tgotohospitalontime. D.ShetoldHarrisabouthermother'sillness. 2.WhatcanwelearnaboutPatriciaHarrisfromthepassage? A.Shethinksithardertolookafterherparentsthenextfewyears. B.Herparentscannottakecareofthemselvesatall. C.Shecannotdoademandingjob. D.ShecannotaffordtogotoCaliforniaoften. 3.What'sthemainideaofthispassage? A.AgingpeopleintheUSareincreasing. B.TherateofheartdiseaseishighinAmerica. C.Itisdifficulttotakecareofagingparentsfromafar. D.Harrisadvisesonlookingafteragingparentsfromafar.
光质不同波长的光会影响叶绿素a叶绿素b对于光的吸收从而影响光合作用的光反应阶段．某生物小组为检测光质对金鱼藻光合作用强度的影响利用提供不同光源的40W的灯泡数个试管数支金鱼藻NaHCO3溶液等实验材料1小时后测定记录数据如下 注O2相对变化量+表示增加﹣表示减少 1叶绿体中色素的功能是．实验中加入NaHCO3溶液的作用是无关变量有．至少写2个 2在绿光条件下金鱼藻叶肉细胞产生ATP的场所有消耗[H]的场所是． 3如图为叶绿素a和叶绿素b的吸收光谱暗带部分表示被吸收的光线已知在漫射光环境中光线以较短波长的光占优势与阳生植物相比推测阴生植物叶绿体中色素含量较高． 4在红光条件下该植物经过2小时光合作用产生氧气总量相对值是． 5根据实验结果推测在大棚种菜时为提高产量需要用的玻璃．
1分Shopliftingisan不合法的behaviorwhichshouldbepunished.
下图中A是某元素在周期表中的相关信息B是该元素的原子结构示意图．1该元素的相对原子质量为2在化学反应中该元素的原子容易电子3原子核外的电子层数与元素所在的周期数相同则该元素应该排在周期表中的第周期．
下列关于生物膜结构和功能的叙述正确的是
水杨酸是植物体内一种重要的内源激素能诱导植物体内产生某些与抗病有关的蛋白质提高抗病能力．为探究水杨酸对不同品系YTAYTB水稻幼苗叶片中蛋白质含量的影响研究人员完成了相关实验其结果如图所示．下列分析错误的是
柑橘果实色香味兼优既可鲜食也可加工成果汁果酒果醋等各种食品．柑橘类的果皮中富含柑橘精油无色透明具有诱人的橘香味是天然香料精油中的一大类在食品以及化妆品行业具有广泛的应用价值．请回答下列相关问题． 1柑橘精油提取 ①为了避免原料发生焦糊有效成分水解等问题橘皮精油的提取一般采用法． ②提取橘皮精油首先要用浸泡原料这是因为石灰水能够破坏细胞结构分解果胶防止橘皮压榨时滑脱提高． ③初步得到橘皮精油后还要分别加入0.25%的小苏打和5%的硫酸钠并调节pH至7～8这样处理的目的是． 2柑橘果酒和果醋制作 ①发酵罐1和发酵罐2中的微生物在结构上的主要区别是前者． ②发酵罐1过程完成后可以用检测发酵产物中是否有酒精产生．若要进一步检测所得果酒中酵母菌的密度可采用法． ③某同学尝试用罐头瓶制作果酒在培养过程中每隔12h左右将瓶盖拧松一次此后再拧紧这样做的主要目的．
某研究人员将某绿色植物放在温度适宜的密闭容器内如图1所示经__处理后置于恒定光照下并测量容器内氧气的变化量测量的结果如图2所示．回答下列问题 1图1中通过变换光源可研究对光合作用的影响． 2将多株健壮的生长状态相同且大小相似假设干重相同的该植株幼苗均分为甲乙两组置于图1的装置中．甲组适宜光照处理乙组__处理其他条件相同且适宜．10小时后将甲乙两组中的植株烘干称重分别记为M甲M乙．若M＝M甲﹣M乙则M的准确含义是． 3图2中A点以后的短时间内叶肉细胞的叶绿体内C3的量将．B点时叶肉细胞内的光合作用速率填“大于”“小于”或等于”呼吸作用速率．在5﹣15mm内该容器内氧^量增加的速率逐渐减小这是因为．如果该植物的呼吸速率始终不变则在5﹣15min内该植物光合作用的平均速率用氧气产生量表示是mol/min．
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