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若a>0且ax=2,ay=3,则ax-y的值为( )
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若a>0b>0且函数fx=4x3-ax2-2bx+2在x=1处有极值则ab的最大值为________
如图所示xyz为三个物块k为轻质弹簧L.为轻线.系统处于平衡状态现若将L.突然剪断用axay分别表示
ax=0
ax≠0
ay≠0
ay=0
因式分解ax2﹣4axy+4ay2
分解因式ax2+2axy+ay2=______________________.
分解因式3ax2+6axy+3ay2
因式分解3ax-6axy+3ay
已知直线l1ax+a+2y+1=0l2x+ay+2=0.若l1⊥l2则实数a的值是
若关于x的不等式ax﹣2>0的解集为x<﹣2则关于y的方程ay+2=0的解为.
分解因式3ax2﹣6axy+3ay2.
已知圆x2+y2+2ax-2ay+2a2-4a=00
已知流速场ux=axuy=-ayuz=0求流函数Ψ
无Ψ
Ψ=a(x
2
-y
2
)
Ψ=a(x
2
+y
2
)
Ψ=axy
已知直线l1ax+2y-1=0直线l28x+ay+2-a=0若l1∥l2则实数a的值为
±4
-4
4
±2
分解因式3ax2+6axy+3ay2=______
-3ax2+6axy-3ay2
已知直线l1ax+a+2y+1=0l2x+ay+2=0.若l1⊥l2则实数a的值是.
分解因式3ax2+6axy+3ay2;
若|x|=3|y|=4且ay<0求a+b+x+y的值.
下列结论正确的是
若A
2
=0,则A=0.
若A
2
=A,则A=E或A=0.
若AX=AY,且A≠0,则X=
Y.
若AB=0,则A,B不一定是零矩阵.
若直线x+ay=2a+2与直线ax+y=a+1平行则实数a的值为.
已知xy是实数且+y2-6y+9=0若ay+3xy=0求实数a的值
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WhenIwas14yearsoldmybestfriend1dragmetoanafter﹣schooldanceclass2IenjoyedsomuchthatIhavebeendancingeversince.AftereverydanceclasshoweverIalwayshavetostretchoutmylegsandback!Itfeelslikeasmuchexerciseas3gotothegym﹣butdancingisnot4wideconsideredtobeasport. Manydancerswouldarguethatdancingisasportasitrequiresstrongmusclesandimpressiveflexibility.Nomatterwhatstyleofdanceyouareparticipatinginyouwillalwaysbeusingallof5youmuscleswhiledancingandthiscanoftenbeforseveralhoursaday. On6otherhandmanypeoplearguethatdanceisanartform.Dancesoftenexhibitemotion情感tell7storyetc.Dancingtomusiciscreativeandvisuallyappealingtotheeyesandearsjustlikewatchingaplayoran8professionband.Theshiningcostumesthestagemake﹣upandthebighairstylesareartisticandimaginative. Howeverwhetheryouconsiderdancetobeanart9asporttheimportantthingistoenjoyit!Dancingisagreatway10makenewfriendsandexercise!
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LastOctoberwhiletendinghergardeninMoraSwedenLenaPahlssonpulledoutahandfulofsmall1carrotandwasabouttothrowthemaway.Butsomethingmadeherlookcloserandshenoticeda2shineobject.Yestherebeneaththeleafytopofonetinycarrotwasherlong﹣lostweddingring. Pahlssonscreamed3loudlythatherdaughtercamerunningfromthehouse.ShethoughtIhadhurt4IsaysPahlsson. Sixteenyears5earlyPahlssonhadremovedthediamondring6cookameal.Whenshewantedtoputtheringbackonlateritwasgone.Shesuspectedthatoneofherthreedaughters﹣thenteneightandsix﹣hadpickeditupbutthegirlssaidtheyhadn't.Pahlssonandherhusband7searchthekitchencheckingeverycornerbutturnedupnothing.Igaveuphopeoffindingmyringagainshesays.Sheneverreplacedit. Pahlssonandherhusbandnowthinktheringprobablygot8sweepintoapileofkitchenrubbishandwasspreadoverthegarden9itremaineduntilthecarrot'sleafytopaccidentallysprouted生长throughit.ForPahlssonitsreturnwas10wonder.
假设你是李华在你校就读的英国交换生Tom因脚部受伤住院你准备和同学们前去探望.请用英语给他写一封邮件内容包括: 1.表示关心;2.告知探望时间及参加人员;3.询问有何需求. 注意:1.词数100左右; 2.可以适当增加细节以使行文连贯. DearTom Yours LiHua
化学小组用如图所示装置研究酸碱盐的性质夹持仪器已省略. 1关闭K2打开K1和分液漏斗玻璃塞活塞向B装置中加入稀盐酸使其浸没大理石后关闭分液漏斗活塞.B中发生反应的化学方程式为. 2当B中的物质仍在反应时关闭K1打开K2.一段时间后C中的现象为充分反应后C中一定含有溶质NaCl的原因是. 3当实验结束后将装罝ABC上层淸液全部倒入同一烧杯中滴加无色酚酞溶液发现酚酞溶液无色请选用一种试剂确定溶质成分几种可能情况写出所加试剂预期现象和结论.
Everyanimalsleepsbutthereasonforthishasremainedfoggy.Whenlabratsarenotallowedtosleeptheydiewithinamonth.1. Oneideaisthatsleephelpsusstrengthennewmemories.2Weknowthatwhileawakefreshmemoriesarerecordedbyreinforcing加强connectionsbetweenbraincellsbutthememoryprocessesthattakeplacewhilewesleephavebeenunclear. Supportisgrowingforatheorythatsleepevolvedsothatconnectionsbetweenneurons神经元inthebraincanbeweakenedovernightmakingroomforfreshmemoriestoformthenextday.3. Nowwehavethemostdirectevidenceyetthatheisright.4Thesynapsesinthemicetakenattheendofaperiodofsleepwere18percentsmallerthanthosetakenbeforesleepshowingthattheconnectionsbetweenneuronsweakenwhilesleeping. IfTononi'stheoryisrightitwouldexplainwhywhenwemissanight′swefinditharderthenextdaytoconcentrateandlearnnewinformation﹣ourbrainsmayhavesmallerroomfornewexperiences. Theirresearchalsosuggestshowwemaybuildlastingmemoriesovertimeeventhoughthesynapsesbecomethinner.Theteamdiscoveredthatsomesynapsesseemtobeprotectedandstayedthesamesize.5YoukeepwhatmattersTononisays. A.Weshouldalsotrytosleepwellthenightbefore. B.It'sasifthebrainispreservingitsmostimportantmemories. C.Similarlywhenpeoplegoforafewdayswithoutsleepingtheygetsick. D.Theprocessestakeplacetostopourbrainsbecomingloadedwithmemories. E.That'swhystudentsdobetterintestsiftheygetachancetosleepafterlearning. F.SleepisthepricewepayforlearningsaysGiulioTononiwhodevelopedtheidea. G.Tononi'steammeasuredthesizeoftheseconnectionsorsynapsesinthebrainsof12mice.
Formanyparentsraisingateenagerislikefightingalongwarbutyearsgobywithoutanyclearwinner.Likeaborderconflict冲突betweenneighboringcountriestheparent﹣teenwarisaboutboundaries:WhereisthelinebetweenwhatIcontrolandwhatyoudo? Bothsideswantpeacebutneitherfeelsithasanypowertostoptheconflict.Inpartthisisbecauseneitheriswillingtoadmitanyresponsibilityforstartingit.Fromtheparents'pointofviewtheonlycauseoftheirfightistheiradolescents'completeunreasonableness不理性.Andofcoursetheteensseeitinexactlythesamewayexceptoppositely.Bothfeeltrapped. InthisarticleI'lldescribethreeno﹣winsituationsthatcommonlyarisebetweenteensandparentsandthensuggestsomewaysoutofthetrap.Thefirstno﹣winsituationisquarrelsoverunimportantthings.Examplesincludethecoloroftheteen'shairthecleanlinessofthebedroomthepreferredstyleofclothingthechild'sfailuretoeatagoodbreakfastbeforeschoolorhistendencytosleepuntilnoonontheweekends.Secondblaming.Thegoalofablamingbattleistomaketheotheradmitthathisbadattitudeisthereasonwhyeverythinggoeswrong.Thirdneedingtoberight.Itdoesn'tmatterwhetherthetopicispoliticsthelawsofphysicsortheproperwaytobreakanegg;thepointoftheseargumentsistoprovethatyouarerightandtheotherpersoniswrongforbothwishtobeconsideredanauthority﹣﹣someonewhoactuallyknowssomething﹣andthereforetocommandrespect.Unfortunatelyaslongasparentsandteenscontinuetoassumethattheyknowmorethantheotherthey'llcontinuetofightthesebattlesforeverandnevermakeanyrealprogress. 1Whydoestheauthorcomparetheparent﹣teenwartoaborderconflict? A.Bothcancontinueforgenerations. B.Bothareaboutwheretodrawtheline. C.Neitherhasanyclearwinner. D.Neithercanbeputtoanend. 2WhatdoestheunderlinedpartinParagraph2mean? A.Theteensthinkitistheirparentswhostarttheconflict. B.Theteensagreewiththeirparentsonthecauseoftheconflict. C.Theteenscausetheirparentsofmisleadingthem. D.Theteenstendtohaveafullunderstandingoftheirparents. 3Parentsandteenswanttoberightbecausetheywantto. A.giveorderstotheother B.knowmorethantheother C.gainrespectfromtheother D.gettheothertobehaveproperly 4Whatwilltheauthormostprobablydiscussintheparagraphthatfollows? A.Causesfortheparent﹣teenconflicts. B.Examplesoftheparent﹣teenwar. C.Solutionsfortheparent﹣teenproblems. D.Futureoftheparent﹣teenrelationship.
Althoughtherearemanydifferenttypesofgenerouspeopletherearesomecommoncharacteristicsthatthemostgenerouspeopleshare.Whethertheygivetheirtimeortheirmoneythesequalitiesarelargelysharedbypeoplemostdevotedtogivingbacktotheircommunitiesandfamilies. Unselfishness Firstandforemostgenerouspeopleareunselfish.1Personalgainmayoccurbutitisnotaninspiringfactorforthemostgenerouspeople. Optimism Generouspeopleareoptimistic.Theyhaveacertainideaofthewaytheworldshouldbeandstruggletoachievethatend.2Asoptimiststheyseetheworldinadifferentlight.Theytrulybelievethattheworldalthoughnotperfectcanbemadeintoamuchbetterplace. Trust Trustisamajorqualityamongthemostgenerouspeople.Theytrustcompletelythattheircauseisaworthyone.3Forthosewhogivethismeansatrustthattheothersassociatedwiththecausewillbeusingtheirtimeandresourceappropriately. Energy Whenyouthinkofpeoplebeinggenerousenergyisoneofthefirstthingsthatcometomind.Thesepeopledevotetheirenergytothegoodthattheywanttodo.4Whenthemostgenerouspeoplespendtheirtimeworkingonagoaltheyareenergizedtodoevenmoregood. 5Ifyouareconcernedwithincreasingyourownlevelofgenerositythesefactorswillgetyoustartedintherightdirection. A.Theyalsogainenergyfromtheircause. B.Reliablepeopleareverypopularinthecommunity. C.Theygivewithouthopesofgainingfortheirgooddeeds. D.Buttheybelievedthattheycanhelpmorepeopledogooddeeds. E.Themostgenerouspeoplesharethesequalitiestodifferentdegrees. F.Theyalsotrustthatthepeopleinvolvedwiththatcausewilldotheirbesttohelpachievethegoal. G.Althoughtheworldisnotaperfectplacethesepeopledonotstopgivingtheirtimeenergyormoney.
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ItwasacoldMarchdayinHighPointNorthCarolina.ThegirlsontheWesleyanAcademysoftballwerewaitingfortheirnextturnsatbatduringpracticestampingtheirfeettostaywarm.Eighth﹣graderTaylorBisbeeshivered发抖alittleasshewatchedherteammateParisWhiteplay.Thetwodidn'tknoweachotherwell﹣Taylorhadjustmovedtotownamonthorsobefore. SuddenlyParisfelltothegroundParis'seyerolledbackTaylorsays.Shestartedshaking.Iknewitwasanemergency. ItcertainlywasParishadsufferedasuddenheartfailure.WithoutimmediatemedicalcarePariswoulddie.Atfirstnoonemoved.Thegirlswereinshock.ThenthesoftballcoachshoutedoutDoesanyoneknowCPR? CPRisalife﹣savingtechnique.TodoCPRyoupressonthesickperson'schestsothatbloodmovesthroughthebodyandtakesoxygentoorgans.Withoutoxygenthebrainisdamagedquickly. AmazinglyTaylorhadjusttakenaCPRcoursethedaybefore.Stillshehesitated.Shedidn'tthinksheknewitwellenough.ButwhennooneelsecameforwardTaylorrantoParisandbegandoingCPRItwasscary.IknewitwasthedifferencebetweenlifeanddeathsaysTaylor. Taylor'sswiftactionhelpedherteammatescalmdown.Onegirlcalled911.Twomorerantogettheschoolnursewhobroughtadefibrillatoranelectronicdevices器械thatcanshocktheheartbackintowork.Luckstayedwiththem:Paris'heartbeatreturned. IknowIwasreallyluckyParissaysnow.Mostpeopledon'tsurvivethis.Myteamsavedmylife ExpertssayParisisright.ForasuddenheartfailurethesinglebestchanceforsurvivalishavingsomeonenearbystepinanddoCPRquickly. TodayParisisbackonthesoftballteam.Taylorwillapplytocollegesoon.Shewantstobeanurse.IfeelmoreconfidentinmyactionsnowTaylorsays.IknowIcanactunderpressureinascarysituation. 1WhathappenedtoParisonaMarchday? A.Shecaughtabadcold. B.Shehadasuddenheartproblem. C.Shewasknockeddownbyaball. D.Sheshiveredterriblyduringpractice. 2WhydoesParissayshewaslucky? A.Shemadeaworthyfriend. B.Sherecoveredfromshock. C.ShereceivedimmediateCPR. D.Shecamebackonthesoftballteam. 3WhichofthefollowingwordscanbestdescribeTaylor? A.Creativeandkind. B.Courageousandcalm. C.Warm﹣heartedandgenerous. D.Intelligentandprofessional.
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我们需要合理开发利用石油资源. 1石油是一种粘稠状液体属于资源选填“可再生”“不可再生”它主要含有两种元素填元素符号. 2石油经炼制得到的等产品可作为机动车燃料. 3以石油产品为原料可进一步生产合成纤维合成橡胶等合成材料.
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