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已知9m=3,9n=4,则92m-n等于( )
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若Am+1n﹣13B2mnm﹣2nCm+3n﹣39三点共线则m+n=.
已知m=+1n=则m和n的大小关系为
m=n
mn=1
m=﹣n
mn=﹣1
计算-8m4n+12m3n2-4m2n3÷-4m2n的结果等于
2m
2
n-3mn+n
2
2n
2
-3mn
2
+n
2
2m
2
-3mn+n
2
2m
2
-3mn+n
已知mn是一元二次方程x2-3x-5=0的两个实数根则代数式mn+m-nm+n-3的值等于_____
已知实数mn满足m﹣n2=2则代数式m2+2n2+4m﹣3的最小值等于
9
6
﹣8
﹣16
已知m﹣n=4mn=﹣1求﹣2mn+2m+3n﹣3mn+2n﹣2m﹣m+4n+mn的值.
若mn是正整数则m+n>mn成立的充要条件是
m,n都等于1
m,n都不等于2
m,n都大于1
m,n至少有一个等于1
如图水平地面上堆放着原木关于原木P.在支撑点M.N.处受力的方向下列说法正确的是
M.处受到的支持力竖直向上
N.处受到的支持力竖直向上
M.处受到的摩擦力沿MN方向
N.处受到的摩擦力沿MN方向
已知实数mn满足m﹣n2=2则代数式m2+2n2+4m﹣3的最小值等于
9
6
﹣8
﹣16
若Am+1n﹣13B2mnm﹣2nCm+3n﹣39三点共线则m+n=.
已知和两种离子的电子层结构相同则a等于
b+m+n
b+m-n
b-m+n
b-m-n
如果am•bn•b3=a9b15那么mn的值等于
m=9,n=﹣4
m=3,n=4
m=4,n=3
m=9,n=6
先阅读下面的内容再解决问题例题若m2+2mn+2n2-6n+9=0求m和n的值.解∵m2+2mn+2
已知mn是方程x2+3x﹣2=0的两个实数根则m2+4m+n+2mn的值为
1
3
﹣5
﹣9
已知n<<m且mn是两个连续整数则mn=.
已知m﹣n=5mn=﹣2则代数式4mn•m﹣n2=__________.
从建筑声学设计角度考虑体育馆内每座容积控制在范围合适
3~4m3/座
4.5~5.5m3/座
6~9m3/座
9m3/座以上
已知正比例函数与反比例函数的图象交于点M.a1MN⊥x轴于点N.若△OMN的面积等于2则的值是___
计算-8m4n+12m3n2-4m2n3÷-4m2n的结果等于.
2m
2
n-3mn+n
2
2m
2
-3mn
2
+n
2
2m
2
-3mn+n
2
2m
2
-3mn+n
已知U=234567M=3457N=2456则 A.M∩N=46 B.M∪N=U
A
B
C
D
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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.
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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.
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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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