首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
解分式方程：+＝4．
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
下列说法中①含有分母的方程是分式方程②分母中含有分母的方程是分式方程③分母中含有未知数的方程是分式方
①②⑤
③④⑥
①②③
④⑤⑥
解分式方程
下列说法中错误的是
分式方程的解等于0，就说明这个分式方程无解
解分式方程的基本思路是把分式方程转化为整式方程
检验是解分式方程必不可少的步骤
能使分式方程的最简公分母等于零的未知数的值不是原分式方程的解
分式方程=4的解是x=
解分式方程
解分式方程＋＝4.
分式方程的解是.
解分式方程.
解分式方程.
解分式方程
解分式方程
解分式方程
解分式方程
下列说法中错误的是
分式方程的解等于0，就说明这个分式方程无解
解分式方程的基本思路是把分式方程转化为整式方程
检验是解分式方程必不可少的步骤
能使分式方程的最简公分母等于零的未知数的值不是原分式方程的解
解分式方程
1解关于m的分式方程=﹣12若1中分式方程的解m满足不等式mx+3＞0求出此不等式的解集.
解分式方程.
解分式方程.
分式方程的解是
下列说法错误的是
解分式方程的基本思路是把分式方程转化为整式方程
检验是解分式方程必不可少的步骤
分式方程的解等于0，就是说明此分式方程无解
使分式方程的最简公分母等于零的未知数的值不是原分式方程的解
热门试题
更多
下列叙述不正确是
下列推出的结论正确的是
如图是某反应的微观示意图下列有关说法不正确的是
15分MolecularbiologistElizabethBlackburnsharedaNobelPrizeforherresearchontelomeres端粒﹣structuresatthetipsofchromosomes染色体thatplayakeyroleincellularaging.1shewasfrustratedthattheimportanthealthimplicationsofherworkweren'treachingbeyondacademia. SoalongwithpsychologistElissaEpelshehaspublishedherfindingsinanewbook2ageneralaudience﹣﹣layingoutascientificcasethatmaygivereaders3tokeeptheirnewyear'sresolutionstonotsmokeeatwellsleepenoughexerciseregularlyand4stress. ThemainmessageofTheTelomereEffectbeingpublishedTuesdayisthatyouhavemorecontroloveryourownagingthanyoumayimagine.Youcanactually5yourtelomeres﹣andperhapsyourlife﹣byfollowingsoundhealthadvicetheauthorsarguebasedonareviewofthousandsofstudies. Telomereslistentoyoutheylistentoyour6theylistentoyourstateofmindsaidBlackburnpresidentoftheSalkInstituteforBiologicalStudiesinLaJoliaCalif. TelomeressitattheendofthestrandsofDNAlikethe7capsonshoelaces.Stressfromaroughlifestylewillshortenthosecapsmakingitmorelikelythatcellswill8dividingandessentiallydie. Toomanyofthesecellsaccelerate9thepairsay.Thisdoesn'tcauseanyparticulardiseasebutresearchsuggeststhatitspeedsupthetimewhenwhateveryourgeneshaveinstorewilloccur﹣﹣soifyou're10toheartdiseaseyou'remorelikelytogetityoungerifyourtelomeresareshortersaidEpeldirectoroftheUniversityofCaliforniaSanFrancisco'sAgingMetabolismandEmotionsCenter. Wecanprovideanewlevelofspecificityandtellpeoplemorepreciselywithclues11fromtelomerescienceaboutwhatexactly12isrelatedtolongtelomereswhatexactfoodsarerelatedtolongtelomereswhataspectsofsleeparemorerelatedtolongtelomeresEpeladded. OtherresearchersinthefieldpraisedBlackburnandEpel'seffortstomaketelomereresearchrelevanttothegeneralpublic13severalwarnedthatitrisked14thescience. Ithinkit'saverydifficultthingtoprovethatlifestylecanaffecttelomerelengthandthereforelifespansaidHarvardgeneticistandanti﹣agingresearcherDavidSinclair.Togetcause﹣effectinhumansis15soit'sbasedonassociations. 1A.And B.Furthermore C.But D.Thus 2A.aimedat B.referredto C.addressedto D.informedof 3A.warning B.motivation C.appealing D.implication 4A.cutdownon B.layemphasison C.addto D.contributeto 5A.shorten B.lengthen C.enhance D.simplify 6A.messages B.attitudes C.instincts D.behaviors 7A.influential B.inevitable C.progressive D.protective 8A.cease B.neglect C.initiate D.maintain 9A.humanhealth B.humanaging C.humanresolution D.psychologicalstress 10A.relevant B.committed C.reluctant D.sensitive 11A.suffering B.emerging C.suspending D.profiting 12A.illness B.gene C.smoking D.exercise 13A.so B.because C.though D.or 14A.oversimplifying B.overestimating C.over﹣viewing D.underestimating 15A.impropriate B.impossible C.irrelevant D.imaginary
初中阶段是学生长身体的重要时期“合理膳食均衡营养”会让我们更健康 1下列食品中富含维生素的是 A鸡蛋B馒头C蔬菜D水果 2为了预防佝偻病青少年可以补充一些含元素的食品．填写化学符号
如图是ABC三种物质的溶解度曲线据图回答 1t1℃时abc三种物质的溶解度由大到小的顺序是填写序号下同． 2若要将c的饱和溶液变为不饱和溶液可以采用的方法是 3将t3℃时abc三种物质饱和溶液的温度降低到t1℃时三种溶液的溶质质量分数大小关系是 4t2℃时a和b两种溶液的溶质质量分数填”一定“或“不一定”相等．
为了测定某纯碱样品杂质为氯化钠中碳酸钠的质量分数数小江同学对样品进行了如图定量实验 1纯碱的水溶液显填“酸性”“碱性”或“中性”之一 2该实验中生成二氧化碳的质量为 3通过化学方程式计算样品中碳酸钠的质量分数计算结果精确到0.1g
将过量的铁粉加入CuNO32和AgNO3的混合溶液中充分反应后过滤下列对滤渣和滤液的说明中不正确的是
10分假如英语课上老师要求同臬之间交换修改作文W你修改你M巣%的以下作文.文中共有10处语言错误苺句中伋多有两处错误.钟处错汉仅涉及一个iYUti】的增加删除成修改. 增加在缺问处加一个漏字符号A并在其下面写出该加的词. 删除把多余的同用斜线\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同. 注意1•每处错误及修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Thismorningourschoolorganizedusstudentstopayingastudyvisit. WerodethebusattheschoolgatethengotoffatCityRevolutionaryMemorialat7﹣50.Therewelistentostoriesaboutrevolutionariesandpresentedflowers.At930wearrivedatthehomefortheoldandplayedmusicforthemhappy.Theneveryonechattedwithelderlypeoplesbringingthemjoy.Laterwereachedatourcity'sspecialeducationschoolwhichwesawdeafandblindstudentstaughtindifferentmethods.Wegavetheirgiftsdonatedbyourclass.Alsoweplayedgameswiththemhopedwecoulddomore. At1130wereturnedtoourschool.Whataimpressiveexperience!
化学用语是学习化学的工具请用化学用语表示 1改良酸性土壤的碱 2硝酸铵中的阳离子 32个亚铁离子 4最常用的溶剂 5用小苏打治疗胃酸过多的化学方程式
下列实验方案不可行的是
下列说法不正确的是
如图所示为实验室中常见的气体制备干燥收集和性质实验的部分目要求回答下列问题 1以石灰石和稀盐酸为原材料在实验室中制备并收集干燥的二氧化碳气体．按照要求设计实验装置连接仪器并检验装置的气密性． ①所选仪器的连接顺序为填写仪器序号字母 ②用石灰石和稀盐酸制取二氧化碳的化学方程式为 ③若将纯净的二氧化碳气体通入装置G石蕊试液中试液显色． ④将大量二氧化碳气体通入盛有大量澄清CaOH2溶液的大烧杯中烧杯中溶液的质量与之前相比会填“变大”“变小”或“不变”之一 3若以过氧化氢溶液为原料以二氧化锰为催化剂在实验室中制备干燥的氧气用来测定CuO和Cu的混合物样品中铜的质量仪器的连接顺序是A→D→C． ①D的作用是 ②加热过程中装置C中的现象是 ③欲通过测量反应前后C处大玻璃管质量的增加来计算混合物中Cu的含量充分反应后C处大玻璃管质量增加0.5克则混合物中Cu的质量为g．
“火立熄”灭火球是一种新型灭火装置它接触到火焰3～5秒后炸开将球体内的灭火干粉释放覆盖在可燃物上同时释放不可燃气体使火焰熄灭．其中的灭火材料是纳米级ABC干粉主要成分是磷酸二氢铵NH4H2PO4磷酸二氢铵在受热时能够生成氨气五氧化二磷和一种常见溶剂X同时吸收大量的热． 1物质的化学式为磷酸二氢铵受热反应的化学方程式属于反应．填“化合”“分解”或“置换”的一个 2该灭火球灭火过程中蕴含的原理是写出一条即可 3磷酸二氢铵还是一种常用的化肥下列说法不正确的是． A该化肥属于复合肥料B．该化肥中不可以与熟石灰混合使用 C．运输储存该化肥时应避免日晒雨淋D．该化肥在物质分类上属于酸
8分DatongamajorcoalproducerinnorthChina'sShanxiProvince300kmfromBeijingwasnotoriousforitspollutedair.Howeverthesituationhaschangedinrecentyearsasthecitypromotesanenergyrevolutionwiththefocusonencouragingnew﹣energyvehiclesanddevelopingwindandsolarpower. Datonghasadvantagesfordevelopingthesolarindustrysinceitenjoys2800hoursofsunshineonaverageannually.Alsoithasrichlandresourcesincludingsunkenlandtheremainsofcoalmining.Thesolarpanelsinthesunkenareaarewidelyspacedwithbushesplantedinbetweentoconservewaterandsoilandpromoteecologicalprotection. Inadditionitsstrongpowergrid输电网cantransmittheelectricityproducedbysolarpowertoBeijingTianjinandsomecitiesinneighboringHebeiProvince. Datongalsohasascienceandtechnologyparktopromotescientificnewideasandappearanceofindustriessuchashigh﹣endequipmentmanufacturinge﹣commerceculturetourismandecologicalagriculture. Howevertheenergyrevolutionisnotmeanttoendtheuseofcoalbuttopromotecleanandefficientconsumption. TheDatongCoalMineGrouphasbuiltacirculareconomyparktopromotegreendiversifiedandlow﹣carboncoaluse.Acirculareconomyisaneconomicsystemtoreducewastegenerationandmakefulluseofresources. Thetransformationofenergystructurehaspromotedthedevelopmentoftourismintheancientcitywithawealthofhistoricalandculturalsites.Todayevenintheoff﹣seasonofNovemberandDecemberfmanytouristsstillgosightseeingorrecuperation疗养.AhiRh﹣HpeedrailwaywillbecompletedthisyearreducingthetraveltimebetweenBeijingandDutongto100minuteswhichisexpectedtopromotethenumberofvisitors. 1Whatdoestheunderlinedwordnotoriousinthefirstparagraphmean? A.Convenient. B.Essential. C.Suitable. D.shameful. 2WhycanDatongsucceedindevelopingnewenergy? A.Becauseithasrichcoalresource. B.Becauseithasattractivetourism. C.Becauseithasparticulargeographyandscientifictechnology. D.Becauseithasfriendlypeopleandpotentialeconomicsystem. 3WhatcanwelearnaboutDatong? A.Itssolarpowerisonlyprovidedforitownuse. B.Ithasstoppedproducingcoalbecauseofpollution. C.NovemberandDecemberareitsbesttouristseason. D.Energytransformationhasbenefiteditinmanyaspects. 4Whatisthebesttitleforthetext? A.EnergyrevolutioninDatong B.Datong'spromisingtourism C.Solarpowerandwindenergy D.NewdevelopmentofDatong
按要求从氮气一氧化碳氧化铁氢氧化钠碳酸氢钠氢氧化铜盐酸硫酸中选择合适的物质将其化学式填写在下列横线上 1一种气体单质2一种可燃性气体 2铁锈的主要成分4一种难溶性的碱 5常作发酵粉的盐6一种挥发性的酸．
某化学兴趣小组进行粗盐提纯溶液配制实验的探究． 1粗盐提纯的实验操作步骤为蒸发在蒸发操作中玻璃棒的作用是． 2用得到的精盐配制100g质量分数为2%的氯化钠溶液． ①计算需要氯化钠固体的质量为g水的体积为mL水的密度近似看作1g/cm3 ②称量用托盘天平称得所需质量的氯化钠并转移到烧杯中．③量取用到的玻璃仪器有．在量取水的过程中如果仰视读数则配制得到的氯化钠溶液中氯化钠的质量分数填“大于”或“小于”或“等于”2% ④溶解用搅拌作用是．
下列变化与空气中氧气有关的是
10分 Whydon'tyouactblack? SincemymiddleschoolyearsI'vebeenaskedthisquestionmorethananyother.Itseemstomethattoomanypeoplehaveletsocietyprogramintotheirbrainswhatshouldbeexpected1meablackpersonbeforeeverinteractingwithme.ButIbelieveinbeingwhoIamnotwho2wantmetobe. Onmyfirstdayofhighschool3gointothemathsclasstwoofmyclassmatespointedandlaughedatme.Iinitiallythoughtmyflywasopenorthatsomething4stickinmyteeth.ButasItookmyseatIheardoneofthestudentswhisperWhyisablackpersontakinghonors?Somyflywasn'topen.Anhonorslevelclasshadsimplybeenjoinedbyastudent5skinwasanunsettlingshadeofbrown. Iamnowinmyjunioryearofhighschool.Istilltakeallhonorscourses.Mywardrobestill6consistsolelyofclothesthatareappropriatetomyproportions.Mymusiclibraryspansfromrocktopoptotechnoandalmosteverythinginbetween.7itcomestochoosingmyfriendsIamstillcolorblind.IcontinuetodomybestworkinschoolinordertoreachmygoalsandyetwhenIlookinthemirrorIstillseeskinofthatsameshadeofbrown. Myskincolorhasdonenothingtochangemypersonalityandmypersonalityhasdonenothingtochangemyskincolor. Ibelieveinbeingmyself.IbelievethatI﹣notanystereotype﹣shoulddefinewhoIamandwhatactionsItakeinlife.Inhighschoolpopularityoftendependsonyourwillingness8followtrends.AndI'vebeentoldthatitdoesn'tgetmucheasiergoingintoadulthood.Buttheonlyotheroptionistosacrificemyindividualityforthesatisfactionandapprovalofothers.Surethiscanbeappealingsincechoosingtokeepmyself﹣respecthasmademeunpopularand9dislikeattimeswithnoendtothatinsight.Others'beingcontentwithme10isnotnearlyasimportantasmybeingcontentwithmyself.
下列关于物质的变化或者性质叙述正确的是
下列物质之间的转化不能够实现的是
要除去下列物质中混有的少量杂质括号内为杂质所用的试剂和操作都正确的是
欲测定某碳酸钠样品中碳酸钠的质量分数取13.25g含有氯化钠杂质的碳酸钠样品加入50g14.6%的盐酸溶液二者恰好完全反应试求 1样品中碳酸钠的质量分数 2反应后溶液中氯化钠的质量分数．结果精确到0.1%
下列事例用化学知识解释正确的是
如图是一定条件下某化学反应的微观模拟示意图下列说法错误的是
河水净化的主要步骤如图所示．有关说法错误的是
8分Kindergartenoutside?Yesindeed.It'spartofagrowingworldwidetrendtowardoutdooreducation.TheschoolsarecalledForestKindergartens. NowthenumbersaresmallintheU.S.buttheideaiswellestablishedinEuropewithschoolsinScotlandEnglandandSwitzerland.ByfarmostofsuchschoolsareinGermanywhichhasmorethan400Waldkindergartens. Childrenattendingsuchparticularschoolenjoyagoodamountofoutdooreducationeachdayrainorshine.Somelessonsarefocusedonnatureothersareacademictopicsdeliveredinanaturalsetting.Inallcasesstudentsareactive﹣notsittingatdesksoronmatsonthefloorbutwalkingrunningjumpingsolvingproblemslikehowtogetthemudoffthebottomsoftheirshoesbeforetheirparentsfindout. Attheseforestkindergartensstudentslearnsciencebyobservinganddoingitlearnmathbyapplyingittothenaturalworldaroundthemlearnlettersandwordsbyputtingthemtogetherusingsightsandsounds.Thechildrenlearntomakecomparisonsusingnaturalthingslikeapplesandrocks.Theydevelopanappreciationforanimalsandplantsintheirnaturalenvironment﹣notjustbylookingatpicturesinabookoronacomputerscreen. Someofthescienceactivitiesinvolveteamworklikeexplainingthebestwaytomoveaheavyobjectshowinghowalever杠杆works.Inothersessionsteachersencouragestudentstodeveloptheirmotorskillsbybuildingwoodentoolssuchashammersandknives. Thesestudentsalsolearnhowtogetalongwithoneanotherindividuallyandinagroup.Theyalsodevelophealthylevelsofself﹣confidencejustfrombeingabletodotheeverydayactivitiesthattheschooloffers. Inatimewhensomanychildrenarebeingclassifiedasobesebecauseoflongtimewatchingtelevisionandplayingvideogamestheseoutdoorschoolshelpchildrenlearnjustasmuchifnotmorefromopeningtheireyestotheworldaroundthem. 1WhichofthefollowingcountryhasthemostForestKindergartens? A.TheU.S. B.Germany. C.TheU.K. D.Switzerland 2Whatisthepurposeofthefourthparagraph? A.Toanalysehowchildrenlearnsocially. B.Tocomparedifferentteachingapproaches C.Toshowhowchildrenlearnacademically D.Todescribehowactivechildrenareintheclass 3WhichmaybeseeninForestKindergartens? A.Childrenaredoinganexperimentwithchemicals. B.Teachersarewritingsomethingontheblackboard. C.Smartphonesarewidelyusedtohelpchildrenlearn• D.Everythinginnatureislikelytobeappliedtoteaching. 4Whatistheauthor'sattitudetoForestKindergartens? A.Negative. B.Doubtful. C.Positive. D.Uncertain.
30分Myfatherisaworkerinauthorityoverotherswhoworkinconstructionsites.WhenIwasyoungitwashewho1mesympathythroughmodeling.Ithasalwaysbeena2formeasIgrowup3otherconstructionworkerswhoworkwithhimcometoourhouseeverySaturdaybecausethatishetimewhenhewill4theirsalariesfortheweek. Iknowmyfatherassomeonewhoisaquietmanjust5everyonearoundhimself.Heissomeonewhois6whenitcomestodisciplinebutIhaveneverbeen7whenbeingraisedbyhim.MaybethatisbecauseIhaveseenhisgentlenessand8tousandtoothers.Sinceheisaworkerin9Ioftenseehimtalkingtotheconstructionworkerswhenevertheyhaveproblems.Heismorelikeafatherthana10tothem. Onedayhereturnedhometellingmethathewouldtreatmetodinnerbecausehehad11hissalary.Laterthatdayhisfriendafellowworkercametoourhousejusttotalktohimand12adviceastowherehecouldgotoseekassistanceforhis13child.Isawhowmyfatherlistenedand14hisfriend'sbackwhilehisfriendwas15.Whenhisfriendwasabouttogohomemyfathergothiswalletandgavehissalarytohim16only2000pesosinhiswallet. Iwasso17whenhedidthatbutso18thatmyfatherwas19togivealmostallofhissalarytohelphisfriendwithhischildinhospital.ItisalessonIwillalways20. 1A.asked B.gave C.taught D.designed 2A.routine B.balance C.tendency D.sign 3A.hearing B.seeing C.thinking D.smelling 4A.increase B.accept C.spend D.pay 5A.noticing B.kidding C.observing D.describing 6A.loose B.strict C.lovely D.humorous 7Athreatened B.loved C.hated D.envied 8A.sympathy B.bravery C.determination D.cruelty 9A.order B.rank C.charge D.turn 10A.doctor B.superior C.colleague D.engineer 11A.wasted B.asked C.reached D.received 12A.askfor B.lookfor C.headfor D.carefor 13A.naughty B.healthy C.sick D.happy 14A.pressed B.beat C.patted D.struck 15A.shouting B.crying Cthinking D.laughing 16A.saving B.donating C.giving D.leaving 17A.shocked B.scared C.frightened D.frustrated 18A.sad B.angry Cbitter Dproud 19A.mean B.unhappy C.surprised D.willing 20A.forget Btreasure C.neglect D.reject
溶液在生活生产中有广泛的应用下列有关溶液的叙述正确的是
下列化学知识不正确的是
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
湘公网安备 43130202000226号