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若二元一次方程组的解为,则a﹣b= .
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若关于xy的二元一次方程组的解也是二元一次方程的解则k的值为__________________.
若二元一次方程组的解也是二元一次方程3x-4y=6的解则k的值为
-6
6
4
8
若关于xy的二元一次方程组的解也是二元一次方程的解则k的值为.
解二元一次方程组1有位同学是这么做的①+②得4x=20解得x=5代入①得y=﹣3.∴这个方程组的解为
若关于xy的二元一次方程组的解也是二元一次方程2x+3y=6的解则k的值为________.
若关于xy的二元一次方程组的解也是二元一次方程2x+3y=6的解求k的值.
下列说法正确的是
二元一次方程只有一个解
二元一次方程组有无数个解
二元一次方程组的解必是它所含的二元一次方程的解
三元一次方程组一定由三个三元一次方程组成
若关于xy的二元一次方程组的解是则关于ab的二元一次方程组的解是
若二元一次方程组的解也是二元一次方程的解求的值.
下列说法正确的是
二元一次方程只有一个解
二元一次方程组有无数个解
二元一次方程组的解必是它所含的二元一次方程的解
三元一次方程组一定由三个三元一次方程组成
如果关于xy的二元一次方程组那么关于xy的二元一次方程组的解是___
请写出一个以xy为未知数的二元一次方程组且同时满足下列两个条件:①由两个二元一次方程组成;②方程组的
写出一个解为y=2的二元一次方程组是_____________
解下列二元一次方程组及不等式组:1解二元一次方程组
若一个二元一次方程组的解是请写出一个符合要求的二元一次方程组____________________
解二元一次方程组的基本思想是即将二元一次方程组转化为一元一次方程.
若关于xy的二元一次方程组的解也是二元一次方程的解求k的值.
若关于xy的二元一次方程组的解也是二元一次方程2x+3y=6的解则k的值为___________
若关于xy的二元一次方程组的解也是二元一次方程的解求t的值和这个方程组的解.
已知是二元一次方程组的解试写出一个符合条件的二元一次方程组__
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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.作文中共有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Λ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. Thisismyfifthdayatthesummercamp.Lifeisn'texactwhatIexpected.WehavetogetupearlytomakeourbedsbeforeourteacherMissLicometoinspect.Afterbreakfastwehavesomeoffreetime.YesterdaymorningIwentfishingbuttheonlythingIcatchwasatreebranch.Intheafternoontherearedifferentactivitylikehorsebackridingandhiking.They'refunsonothingnewforme.Intheeveningeveryoneisassignedadifferenttasktogetdinnerready.YesterdayIwasinchargeofpreparethehotdogsbutIaccidentallydroppeditinthefire.Thebestpartofcampisatnightwherewesitaroundacampfireandtellstories.
物质的宏观性质与微观构成的相互联系是化学特有的思维方式.下列对物质的微观解释不正确的是
下列变化属于化学变化的是
下列有关金属的说法正确的是
化学就在我们身边.现有①石墨②氯化钠③稀硫酸等几种物质.选择适当的物质填空填序号 1可用于金属表面除锈的是 2可用于配制生理盐水的是 3可作干电池电极的是.
Joyce:Whatdoyouthinkoftheleadteacher'sspeech? Caroline:Ithinkitwas1interest. Joyce:2doI.IhearMikeislikelytowinalltheprizesintheexamsthisyear. Caroline:Yeshisteachersaysso.He3workhardathislessonseveryeveningformonths.HewanttogotoOxfordUniversitynextyear. Joyce:Ihopehewillrealizehisgoal. Caroline:Ihopeso.4Ithinkheworkstoohard.Ihopehe'llgooutandenjoy5forachange.HowaboutyoursonCarl? Joyce:Don'tmentionhim.Carlneverstartsstudying. Caroline:You'rejoking.IheardthatCarl6winthecompositionprize. Joyce:Youhavemade7mistake.ThatisWhiteCarl.MysonisBrownCarl.Thewhitesliveinthesamecommunity8wedo.WhiteCarlhasalwaysbeensohardworking.Hewantstobea9write.Mysonlikesgoingtotheconcert.Heonlylikessinging. Caroline:10hepracticessinginghewillbecomeasingerinthefuture. Joyce:Notallpeoplecanbecomeasinger.Idon'tthinkhehasthetalent.
A﹣G是初中常见的物质其中E为黑色固体.如图为这些物质的转化关系其中部分生成物和反应条件已省略. 1写出下列物质的化学式C. 2B→D转化过程的基本反应类型是. 3写出E→G的化学方程式.
I'velearnedseveralforeignlanguagesasanadultandwasabletolearnFrenchtofluentconversationin17days. In2005IstayedwithaFrenchfriendinaFrenchvillage.NooneinthevillagespokeEnglishandmyfriendrefusedtospeakEnglishaswell. IsetuparoutinewhereIdidthesamethingseveryday. InthemorningIpracticedwritingvocabularyfor2hours.Ibelievewritingthingsoutisthebestwaytomemorizethings. WhilewritingIwouldlistentoFrenchlearningMP3s.It'sreallyhelpfultohearotherstudentsmakemistakesthatyoucanlearnfromjustlikearegularclassroomenvironment. IhadlunchwithmyFrenchfriendseveryday.AstheyrefusedtoslowdownwhenspeakingtomeinFrenchitwastolearnortostarve! IntheafternoonIreadCharlieandtheChocolateFactoryinFrench.Readingthechildren'sbooksyoureadasachildisagreatwaytolearnnewlanguages.Firstlythelanguageusedissimpleandsecondlyknowingthestoryhelpsyoutoguessthemeaningofnewwordsandavoidusingadictionary. IspentanhourwritingbasicessaysaboutthingsthatalwaysgetaskedlikeWhereareyoufrom?Whatdoyoudo?whichIhadmyFrenchfriendcheckforerrors.Bylearningready﹣madeanswersyoupracticewhatyoulearnedandbuildupyourconfidence. Anothergoodtipistolearnthefillerwordswhichpeoplesaybetweensentencesbuthavenorealmeaningallowingyoutobuytimeinconversation. After17daysIwenttoPariswhereImetagirlinacoffeeshop.WhenItoldherIhadbeenlearningFrenchfor17dayssheinsistedthatIhadlivedinFranceforatleastayear. 1Thewritermaycomefrom. A.France B.Germany C.China D.theUSA 2WhichofthefollowingisNOTwhatthewriterdoesinlearningFrench? A.ShewrotenewFrenchwordsonebyoneagainandagaineverymorning. B.ShewouldlistentoaFrenchteachingclassbyMP3whileshewaswriting. C.Shehadsupperwithherfriendseverydaypracticetalkingwiththem. D.Shewroteanswerstosomeusualquestionstobuildupherconfidence. 3Whatisthepurposeofthewritertowritethisessay? A.Totellpeoplethatshewasaverygoodlanguagelearner. B.Tosharewithpeoplesomemethodsoflearningalanguage. C.Tokeeparecordofherexperienceoflearningalanguage. D.Totellpeoplethatitwasnoteasytolearnanewlanguage.
某同学为探究镁锌铜银的活动性顺序设计如下图所示试验依据实验流程设计下面对物质①②的选择合理的是
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Jealousofthekidsatschoolwhoaresmarterthanyouandseemtolearnmorequickly?Don'tworry.1 2HoweveraccordingtoarecentstudyIQcanrise﹣﹣notjustbyoneortwopointsbutbyasmanyas21points! ScientistshavefoundthatIQchangesarelinkedtochangesinpartofthebraincalledgraymatterwhichwasseentogrowandbecomedenserinthebrainsofpeoplewhoseIQsimprovedgreatly.3Oneistotrainyourshort﹣termmemory.Previousresearchhasproventhatshort﹣termmemoryisthebasisforintelligencesotryingtorecognizeorretellsomethingthatyouhaveseenorheardcanhelpraiseyouroverallbrainpower.4 Agoodnight'ssleepwillalsohelpimproveyourconcentration.5Ithelpsyoustayfocusedforlongerthenextday. Scientistshavealsofoundthatexercisehelps.Walking30minutesadayfivetimesaweekanddoingexercisewillhelpyoubecomemoreknowledgeableaswellashealthierandfitter. A.Thereareseveralwaysofincreasingyourbrain'sgraymatter. B.Yourbraindealsmoreefficientlywiththingsyoutrulylike. C.Withabitofbraintrainingthechancesarethatyoucanbeassmartastheyare. D.Somaybeit'sagoodideatogetyourbrainintrainingrightaway. E.Gettingenoughsleepislikepushingtheresetbuttoninyourbrain. F.Themoreyouworkonitthebetteryouwillbecome. G.Peopleusedtoassumethataperson'sIQwasunchangeable.
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Whenadoglosesalegtheanimaleventuallyfiguresoutthebestwaytogetaroundonthreelegs.Inashorttimethedoglearnstodealwithitsphysicaldisability.Nowscientistshavedevelopedrobotsthatbehaveinmuchthesameway. Wecanfindrobotseverywhere.Robotsbuildcarsplaychessandcancleanyourhouse.Theymaysomedaydriveyourcartoo.TworobotsnamedSpiritandOpportunityweresenttoMarsonamissiontoexploretheredplanet.JeffCluneisacomputerscientistfromtheUniversityofWyoming.Hesaysrobotsalsohelppeopleinnaturaldisasters.Robotsareusedinsearchandrescueoperationsfollowinganearthquake.Theymaysomedayalsobeusedtoexaminethewreckage残骸ofanuclearaccidentliketheoneinFukushimaJapan.Mr.Clunesaysrobotscanbesenttoalotofplacessaidtobeunsafe.Theproblemisthatallofthosetypesofsituationsandenvironmentareextremelyunpredictable.Anditisverylikelythatrobotsandhumansinthosesituationsbecomedamaged.Heandotherscientistsaredevelopingtechnologysothatrobotswillcontinueoperatingafterthefirstsignofinjury.Theywantthemachinestohavetheabilitytomakechangesandcontinueperforminguntiltheycanberepaired. Mr.CluneandresearchersinFrancehaveaddedonemoreoperationtotheskillsetofrobotsworkingunderdifficultconditions.Theysaytheyprogrammedarobotonewithsixlegsandaroboticarmtolearnhowtodealwithinjury.TheirfindingswerereportedinthejournalNature.Mr.Clunesaidthatoncetherobotsbecomedamagedtheyusetheirintuition直觉andknowledgeofhowtheirbodyworkstofindawaytodealwiththedamage.Hesaystherobotsarealsoprogrammedwithchild﹣likecuriosity.Inotherwordstheyarealwaysaskingquestionsandlookingforanswers.Thewholeprocesstakesaboutaminutefortherobotstofindawaytoovercomedamage. 1Atthebeginningofthepassagethewritermentionsdogsto. A.introducethetopicinamoreattractiveway B.provideexamplesofhowanimalsdealwithunexpectedinjury C.provehowscientistsgetinspirationfromdogstodeveloptechnology D.showtherelationshipbetweendogsandrobots 2AccordingtothepassagenowadaysrobotsCANNOT. A.helppeopleinsearchandrescueoperationsfollowinganearthquake B.besentonamissiontoexploreontheMars C.examinethewreckageofanuclearaccident D.buildcarsorcleanthehouse 3WhyareMr.Cluneandotherscientistsdevotedtodevelopingthetechnology? A.Theyexpecttoenablerobotstocontinueworkingdespiteinjuryunderdifficultconditions. B.Theywanttosucceedinprogrammingrobotwithchildlikecuriosity. C.TheyaredeterminedtodesignamorepowerfulrobotforMarsexploration. D.Theyintendtomakerobotswhichcanbesenttoalotofplacessaidtobeunsafe. 4Nowscientistshavedevelopedrobotsthatoncedamagedcan. A.continueperforminginspiteofthedamage B.relyontheirfunctionstofigureoutawaytohandlethedamage C.spendaboutanhourfindingawaytoovercomedamage D.maintaintheirchildlikecuriosityandkeepaskingpeoplearoundforsolutions
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水是生命之源.下列有关水的说法正确的是
InthesmalltownsoftheUnitedStatesinthe1nineteencenturythegeneralstorewas2everyoneboughtthethingshecouldn'tmake3growathome.Whatthestoressold4tellagreatdealabout5lifeatthattime.Peopleboughttoolsthattheyneededforfarmwork;saltsugarand6foodsthatthefarmdidn'tproduce;articlesofclothingthattheycouldn'tmake7;shirtsforthemen;orclothesforthechildren.Lifewassimplethen.Onefeelsthatpeoplewere8thankforwhattheyhadandthattheylookedforwardwithcourageto9thefuturebrought.Itwouldbeinterestingtoknowhowtheywouldfeelaboutthelifetoday.Woulditseemtothemthatlifeistoocomplex?Wouldtheyenjoy10livealifeaswedonow?
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Soyouwanttodrawmoneyfromabank?Doityourself.WanttofixtheInternetconnection?Doityourself.Needaboardingcardforyourflight?Doityourself.Intheorycompaniescansavemoneybyreplacinghumanworkerswithautomatedself﹣servicesystemswhilecustomersgainmorechoicesandgetquickerservice.Surelytheexpansionofself﹣serviceintomoreandmoreareasistobewelcomed? Notnecessarily.Whenitisdonewellself﹣servicecandogoodtobothcompaniesandcustomers.Butwhendonebadly﹣whohasnotfoundthemselvestrappedinaseriesofendlesstouch﹣tonemenus?Inareaswhereself﹣serviceisonlyjuststartedthisislessofaproblem:angrycustomerscanafterallalwaystaketheirbusinesselsewhere.Butifeverybankweretopreferself﹣servicesystemscustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet.Asaresultsomebanksforexamplealreadypromisethattheirtelephone﹣bankingservicesalwaysofferthechoiceoftalkingtoahumanoperator.Butinreturnforhumanservicemanycompanieswillsimplychargemore. Anotherdisagreementtoself﹣serviceisthatwhileitsavescompaniesmoneyitdoesnotalwayssavetheircustomers'time.Inthebestcasesitdoesofcourse:checkingyourselfinattheairportcanbequickerthanqueuingormakingaphonecall.Butasmoreandmoretasksareontocustomerstheymaystarttohopeforthedaysofold﹣fashionedservice. Allofthissuggeststhattherearelimitstohowfarself﹣servicecanbetaken.Companiesthatgotoofardowntheself﹣servicerouteortodoitincorrectlyarelikelytofindthemselvesbeingpunished.Insteadabalancebetweenself﹣serviceandtraditionalformsofserviceisnecessary. 1Whatadvantagesdoestheself﹣servicetechnologycertainlybring? A.Cuttingthecostforthecompanies. B.Savingmoneyforcustomers. C.Offeringcustomersextramoney. D.Defeatingthetraditionalformsofservice. 2Whatdoesthewritermeanbysayingcustomerswouldnolongerbeabletoexpresstheirdiscountbyvotingwiththeirfeet? A.Customerswouldbesoangrythattheykickanddamagethemachineprovidingself﹣service. B.Customerswouldnotbeabletoexpresstheirangeratthebank'sservicebyleavingthere. C.Customerswouldtrytheirbesttopersuadethebanktostopself﹣service. D.Customerswouldelectsomeleaderstohaveatalkwiththebank. 3Fromthispassagewecanseethatthewritertheuseofself﹣service. A.dislikes B.supports C.thinkshighlyof D.makescarefuljudgmenton
下列实验操作中错误的是
TimeTravel Ifyoucouldtravelintimewherewouldyougo?PerhapsyouwouldwatchanoriginalperformanceofaShakespeare'splayinElizabethanEngland?WhatabouthangingoutwithLaoziintheSpringandAutumnPeriod?Ormaybeyou'dvoyagefaraheadofthepresentdaytoseewhatthefutureholds. Thepossibilityoftimetravelisindeedappealing.Storiesexploringthesubjecthavebeenaroundforhundredsofyears.PerhapsthebestknownexampleissciencefictionnovelTheTimeMachinewhichwaswrittenbyH.G.Wellsandpublishedin1895forthefirsttime.Itwasadaptedintoatleasttwofeaturefilmsofthesamenameaswellastwotelevisionversionsandalargenumberofcomicbookadaptations.Itisgenerallycreditedwiththepopularizationoftheconceptoftimetravelusingavehiclethatallowsanoperatortotravelpurposefullyandselectively.ThetermtimemachinecoinedbyWellsisnowuniversallyusedtorefertoavehicletransportingpeopleintothefarfuture. Butcouldtimetravelactuallybepossible?Somescientistssayyesintheory.Theyproposeusingcracksintimeandspacecalledwormholeswhichcouldbeusedasshortcutstootherperiods.Einstein'stheoryofrelativityallowstimetravelinextremecircumstances.AndBritishphysicistStephenHawkingsaysyoucouldtravelintothefuturewithareallyfastspaceship﹣goingatnearlythespeedoflight.Thoughbuildingsuchaspaceshipwouldofcoursebenosimpletask. Evenifyoucouldtravelintothepastthereissomethingcalledthegrandfatherparadox.Itaskswhatwouldhappenifatimetravelerweretogobackintimeandhavehisowngrandfatherkilledforsomereasonandthereforepreventhimselffrombeingborn.Ifthetimetravelerwasn'tbornhowwouldhetravelbackintime? Andwouldyoureallyliketovisitthefuture?InH.G.Wells'bookthemaincharactertravelsintodistanttimewherehearrivesatabeachandisattackedbygiantcrabs.Hethenvoyages30millionyearsintothefuturewheretheonlylivingthingisablackobjectwithtentacles触角.Ifthat'swhat'sinstoremaybewearebetterjustlivinginthepresentdayafterall. 1ThenovelTheTimeMachinementionedinParagraph2aimstoshow. A.thespecialfeatureofthebook B.People'sinterestintimetravel C.thelonghistoryoftimetravel D.thecontributionofH.G.Wells 2Einstein'sandHawking'stheories. A.suggestthepossibilitytoinventthetimemachine B.havesimilaritiesinmanyways C.haveprovedwrongbysometimetravelers D.pushtheinventionofthefirstspaceship 3InParagraph4grandfatherparadoxprobablyreferstotheideathat. A.thetravelerispreventedfrommeetinghisgrandfather B.thetravelergoesbackintimetoseekforhisgrandfather C.thegrandfather'sdeathmakesthetraveler'sbirthimpossible D.Thereunionofthetravelerandhisgrandfatherbringshappiness 4Accordingtothepassagewhatisprobablytheauthor'sattitudetowardstimetravel? A.Supportive. B.Unconcerned. C.Unclear. D.Skeptical.
我们学化学用化学爱化学让化学知识服务于人类.下列叙述正确的是
我们可以利用如图所示的三种关系对某些知识进行归纳梳理.下列判断正确的是
I'vereadlotsofstoriesaboutfamilymemories.Inthose1.I'vefoundvoiceofsadnessandlonging.It'struethatsomuchinourdailylivesmakesus2allthetime.Wefindourselveswithlessandtimetospendwithour3andfriends.I'vehadthesame4myself. Iusedtohave5timeswithmygrandfatherwhenwelivedtogether.WhenIwasveryyoungIoftenenjoyedspendingtimeinhis6watchingtheflowersandwateringthefruittrees.ButasIgrewupI7becameselfish. OncewhenIwas6wewentshoppingtogether.Aswetookthewrongbusandendedupgetting8unabletofindourwayback.Icouldn'tstay9andshoutedrudelyinhisface.Iwassostubborn固执的thatIwouldn'tstaysorry10returninghomethinkingIhaddonenothingwrong. NowI11howridiculous可笑的Iwasatthetime!AndIalsorealizehow12itwaswhenIfinallyadmittedIwas13!WhenItrulywantedtoexpressmy14mygrandfatherhadleftus15leavingmewithnomorechanceto16mymistake.Icouldn't17saytohimthethreewords﹣﹣﹣﹣Iamsorry. Wearespendingmoreandmoretimeoutsidewithlessandlesstimeto18withourfamiliesathome.So19themostofeverysecondyouhavewithyourlovedonesbecausetime20goingwaitingfornoone. 1A.books B.stories C.reports D.films 2A.crazy B.easy C.busy D.angry 3A.families B.classmates C.colleagues D.employers 4A.adventure B.research C.exploration D.experience 5A.good B.hard C.sad D.urgent 6A.kitchen B.garage C.house D.garden 7A.frequently B.rarely C.gradually D.finally 8A.bored B.lost C.hurt D.upset 9A.calm B.awake C.firm D.happy 10A.while B.unless C.until D.after 11A.learn B.imagine C.realize D.agree 12A.early B.late C.nice D.guilty 13A.serious B.nervous C.wrong D.painful 14A.concern B.worry C.opinion D.regret 15A.forever B.somehow C.alone D.instead 16A.careabout B.apologizefor C.thinkof D.referto 17A.again B.often C.even D.still 18A.spare B.save C.take D.kill 19A.follow B.receive C.divide D.make 20A.needs B.keeps C.misses D.stops
Alexis17satquietlyinthepassengerseatofherdad'scar.Shelethereyeslazilyscanthelandscapeforwildlife.Thenadeercameintoviewabout200yardsinfrontofthem.Dadthere'sadeerthere!Alexissaid.Itwasamaledeerwithsharpantlers角oneachsideofitshead. AsthecarmovedcloserAlexissawthatthedeer'sheadwasbenttowardtheground.Thensheheardascreamandsawanarmflyupnearthedeer'shead.Alexisrealizedthedeerwasattackingawoman.Suea44﹣year﹣oldmotherhadbeenoutforhermorningrun.Thedeerfollowedherandedgedcloser.IknewIwasintroubleSuesays.Shewenttopickupastickforself﹣defenseandthedeercharged.Itliftedherwithitsantlersandthrewherintotheair.Suecouldfeelbloodflewdownherleg.Withinsecondsthedeerhadpushedherofftheroad. WhenAlexisandherfatherpulledupthedeerwasthrowingSuelikeadoll.Alexislookedintothewoman'sterrifiedeyesandbeforeherfatherhadevenstoppedthecartheteenagerjumpedquicklyoutofthecarandrantowardthedeer.Iwaskickingittogetitsattentionshesays.Thenherfatherwhohadfollowedhisdaughterpushedthedeerawayfromthewomen. AlexishelpedSueintothecarandthenappliedapieceofclothtoSue'sinjuredleg.We'regoingtogetyoutoahospitalAlexissaid.Thensheheardherfathershoutloudly.Hehadbeenknockedtotheground.Alexistookholdofahammerfromthecarandrantowhereherfatherlayonhisback.Shebeatthedeer'sheadandneckbuttheblowsdidn'tscareitaway.Iwaslosingfaithshesays.AcouplemorestrikesAlexissaidherfather.Youcandoit.TurningthehammeraroundAlexisclosedhereyesandbeatthedeer'sneckwithallherstrength.Whensheopenedhereyesthedeerwasrunningaway.Alexisgotinthedriver'sseatandspedtowardthenearesthospital. AfterSuewastreatedshetearfullythankedherrescuers.Youexpectateenagegirltogetonthephoneandcallforhelpshesaysnottobeatupadeer. 1WhatwasSuedoingwhenshewasattackedbythedeer? A.Shewasdrivinghome. B.Shewasrestingontheroad. C.Shewastakingexercise. D.Shewasfeedingwildanimals. 2WhatdidAlexisdotosaveSue? A.Shepushedthedeeraway. B.Shehitthedeerwithherfeet C.Shedrovethecartohitthedeer. D.Shebeatthedeerwithahammer. 3WhichofthefollowingwordscanbestdescribeAlexis? A.Strong. B.Cruel. C.Energetic. D.Brave. 4Whatisthebesttitleforthepassage? A.AWomanWasSeriouslyInjured B.ADangerousDeerAttackedaWoman C.AGirlRescuedHerFatherSuccessfully D.ATeenagerSavedOthersfromaDeerAttack
在购买和使用化肥时要了解化肥的性质以便合理使用.为了给农民做技术指导大海同学利用自己掌握的知识对碳酸钾硫酸铵两种化肥的相关性质做了一下探究请将下列实验报告填写完整. 【实验记录与分析】 【结论与应用】碳酸钾和硫酸铵不能混合使用原因是碳酸钾溶液呈碱性与硫酸铵混合施用产生NH3降低肥效. 【知识拓展】鉴别失去标签的碳酸钾和硫酸铵固体请你用两种不同类别的试剂一次性鉴别它们.请写出所用的试剂.
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