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已知点P是直线y=2x﹣4上的动点,点Q是曲线y=x+ex上的动点,则|PQ|的最小值为( )
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高三下学期数学《》真题及答案
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如图已知直线y=2x分别与双曲线y=y=x>0交于P.Q.两点且OP=2OQ点A.是双曲线y=上的动
P.为曲线y=lnx上的一动点Q.为直线y=x+1上的一动点则|PQ|的最小值是.
已知曲线y=2x2-7求1曲线上哪一点的切线平行于直线4x-y-2=0?2曲线过点P.39的切线方程
已知点P.在直线x+y+5=0上点Q.在抛物线y2=2x上则|PQ|的最小值等于.
已知函数fx=e﹣2x﹣axa为常数的图象与y轴交于点A曲线y=fx在点A处的切线垂直于直线x+2y
已知直线l13x+4y﹣2=0和l22x﹣5y+14=0的相交于点P..求1过点P.且平行于直线2x
设Pabb≠0是平面直角坐标系xOy中的点l是经过原点与点1b的直线记Q.是直线l与抛物线x2=2p
已知圆C1x2+y2=r2r>0与直线l0y=相切点A.为圆C1上一动点AN⊥x轴于点N.且动点M.
已知点P.是曲线y=x2-lnx上的一个动点则点P.到直线ly=x-2的距离的最小值为_______
若动点P.在y=2x2+1上则点P.与点Q0-1连线中点的轨迹方程是__________.
已知点A.-30B.30动点P.满足|PA|=2|PB|.1若点P.的轨迹为曲线C.求此曲线的方程2
设P是直线y=2x﹣4上的一个动点过点P作圆x2+y2=1的一条切线切点为Q则当|PQ|取最小值时P
已知点
(1,0),直线l:y=2x-4,点R.是直线l上的一点,若
,则点P.的轨迹方程为( ). A.y=-2x
y=2x
y=2x-8
y=2x+4
已知点P.在直线x+y+5=0上点Q.在抛物线y2=2x上则|PQ|的最小值等于________.
已知圆O.的方程为x2+y2=4过圆O.上一动点M.作平行于x轴的直线m设m与y轴的交点为N.若向量
已知点P.是直线2x-y+3=0上的一个动点定点M.-12Q.是线段PM延长线上的一点且|PM|=|
2x+y+1=0
2x-y-5=0
2x-y-1=0
2x-y+5=0
已知直线y=﹣x+4与x轴和y轴分别交与A.B.两点另一直线过点A.和点C.73.1求直线AC对应的
设点P.是曲线y=2x2上的一个动点曲线y=2x2在点P.处的切线为l过点P.且与直线l垂直的直线与
设圆C的圆心在直线3x+y﹣7=0上且圆经过原点和点3﹣1.1求圆C的方程2若点P是圆C上的动点点Q
若动点P.在曲线y=2x2+1上移动则点P.与点Q.0-1连线中点的轨迹方程是__________.
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Themanhasmanywhowanttokillhim.enemy
Inonehighschoolbiologyclassalmostfourinevery10low﹣incomestudentswouldfailthecourse.Butwithsomesimplepracticestoreducetestanxiety焦虑researcherscutthatnumberinhalf. ChristopherRozekisapsychologistatStanfordUniversity.Hestudieshowstressandotherthingscanaffectlearning.Reducingtestanxietyhadraisedtestscoresinseveralsmallstudies.SoRozekandhisteamdecidedtotestitonalargerscale.Rozek'sgroupwantedtoknowifshortstress﹣reliefactivitiesbeforeanexamwouldaffectastudent'sgrade.Theytested1175biologystudentsatalargepublichighschoolinIllinois.Atthisschoolalittlemorethanhalfoflow﹣incomestudentsfailtheirbiologyfinals.Only6percentofhigh﹣incomestudentsfail. Theydividethestudentsintofourgroups.Onegroupspent10minutesfree﹣writingabouttheirfears.Thiswasdesignedtoclearthekids'headssothattheycouldthenfocusontheexam.Anothergroupreadhowthebodyrespondstostressandhowthesecanactuallyhelpwithattention.Thentheyansweredreadingcomprehensionquestions.Studentsinathirdgroupdidbothofthesereadingandwritingactivities.Afourthgroupcalledtheactivecontrolgroupreadapassagethattoldthemtojustignoretheirworries. Afterwardthestudentsalltooktheirfinaltestinbiology.Atotalof205low﹣incomestudentsdidoneorbothstress﹣relievingactivities.Onaveragethesestudentsscoredhigherontheexamthantheirclassmatesinthecontrolgroup.Indeed82percentofthempassedtheclass.Only61percentofthelower﹣incomestudentsinthecontrolgrouppassed.Itdidn'tseemtomatterwhetherastudentreadorfree﹣wroteaboutmanagingstressorboth.Allmethodsworkedequallywellathelpingstudentspasstheirtests. Nearlyallthehigh﹣incomekidspassedtheclasswhethertheydidtheactivitiesornot.Thesestudentsmaybelessnervousbeforeexams.OrtheymayhavealreadylearnedwaystodealwiththestressRozeksays. 1Thecontrolgroupinthestudyreferstothestudentswho. A.didthefree﹣writingabouttheirfears B.werenotaffectedbytheirexamstress C.werecontrolledtobeactiveinexams D.receivednostress﹣relievingtraining 2Wecanlearnfromthestudythat. A.allthestress﹣relievingactivitieshadapositiveeffectonthelow﹣incomestudents B.thehigh﹣incomestudentsperformedaswellasthelow﹣incomestudents C.allthelow﹣incomestudentswhodidstress﹣relievingactivitiespassedtheexam D.Fewlow﹣incomestudentswhodidnotdostress﹣relievingactivitiespassedtheexam 3Whydidthestress﹣relievingactivitiesmakenodifferenceforthehigh﹣incomestudents? A.Becausetheywereveryrich. B.Becausetheyhadpossiblybeentrained. C.Becausetheywerenotnervous. D.Becausetheyhadstudiedthesubjectwell. 4Whatistheauthor'spurposeinwritingthetext? A.Topresenttheresultofaresearch. B.Todrawteachers'attentiontoexamstress. C.TointroduceapsychologistatStanfordUniversity. D.Toencouragestudentstodostress﹣relievingactivities.
如图所示是电路元件甲乙的电流与电压变化规律图象.当甲乙两元件串联后接在某电路中时测得通过它们的电流为0.3A那么电源电压是V当甲乙两元件并联后接在某电路中若测得甲乙两元件的干路电流为0.5A则乙元件两端电压为V.
如图在6×6的方格纸上有△ABC和△DEF它们的顶点都在格点上AG和DH分别是它们的高则AGDH等于A.12 B.23 C.13 D.34
R1和R2两只电阻串联.已知R1R2=51那么通过它们的电流之比I1I2=两只电阻两端各自的电压之比U1U2=这两电阻两端的总电压跟R2两端电压之比U总U2=
如图所示电路中R1R2串联电源电压为4VR2=12Ω.S闭合时电流表的读数为0.25A.求1R1两端电压2R1的阻值.
学了电路后小明设计了四个体重计原理图你认为可行的是
填表直线与圆的位置关系相交相切相离公共点个数圆心到直线的距离d与半径r的关系
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如图边长为a的大正方形剪去一个边长为b的小正方形后将剩余部分通过割补拼成新的图形.根据图形能验证的等式为
计算-110×22+-23÷2
Jimmyanengineerlosthisjobafewmonthsago.Buthealways1applyingforanewjob. Onedayhegatheredupallhiscouragetoattendajobinterview.Hisappointmentwasat10amanditwasalready830.2waitingforabustotheofficewherehewouldbeinterviewedhesawanelderlyman3kickingthetyreofhiscar.4therewassomethingwrongwiththecar.Jimmywentuptoofferhelp.WhenJimmy5workingonthecartheoldmanaskedhimhowmuchheshouldpayforthe6.Jimmysaidtherewasnoneedtopayhimhejusthelpedsomeone7andhehadto8foraninterview.ThentheoldmansaidWellIcouldtakeyoutotheoffice.It'sthe9Icoulddo.PleaseIinsist.Jimmyagreed. UponarrivalJimmyfoundalonglineofapplicantswaitingtobeinterviewed.Jimmystillhadsome10onhimafterthecarrepairbuthedidnothavemuchtimetowashitoff.Onebyonetheapplicantslefttheofficeloweringtheirheadswith11lookontheirfaces.Finallyhis12came.Theinterviewerwassittingonalargechair13theofficewindow.14thechairbackandforthheaskedDoyoureallyneedtobeinterviewed?Jimmy'sheart15.WiththewayIlooknowhowcouldIpossiblypassthisinterview?he16tohimself. ThentheinterviewerturnedthechairandtoJimmy's17itwastheoldmanhehelpedearlierinthemorning. SorryIhadtokeepyou18butIwasprettysureyouwouldbepartofourworkforcebeforeyou19steppedintotheoffice.Ijustknowyou'dbea20worker.Congratulations! 1A.enjoyed B.expected C.dreamed D.feared 2A.Since B.While C.Until D.Before 3A.wildly B.rapidly C.gradually D.regularly 4A.Unfortunately B.Unlikely C.Undoubtedly D.Unusually 5A.admitted B.finished C.avoided D.appreciated 6A.service B.attitude C.change D.rescue 7A.indanger B.inorder C.inhonor D.inneed 8A.return B.rush C.beg D.fight 9A.best B.most C.least D.smallest 10A.steam B.ink C.rubbish D.oil 11A.amazed B.disappointed C.frightened D.confident 12A.turn B.name C.progress D.strength 13A.hiding B.examining C.facing D.rubbing 14A.Repairing B.Rocking C.Pushing D.Drawing 15A.beat B.rose C.settled D.sank 16A.thought B.agreed C.responded D.shouted 17A.terror B.anger C.concern D.surprise 18A.waiting B.working C.planning D.moving 19A.still B.just C.even D.seldom 20A.generous B.reliable C.independent D.polite
从边长为a的大正方形纸板挖去一个边长为b的小正方形纸板后将其裁成四个相同的等腰梯形如图甲然后拼成一个平行四边形如图乙那么通过计算两个图形阴影部分的面积可以验证成立的公式为
在探究“通过导体的电流与电阻的关系”的实验中小芳同学连接的电路如图1所示已知电源电压恒为6.0V滑动变阻器R2规格为“30Ω0.5A” 1请将图1中的实物电路连接完整要求滑动变阻器的滑片向右滑动时电路中的电流变大且导线不允许交叉. 2正确连接电路后调节两变阻器的阻值至最大并闭合开关发现两电表示数均为零则电路故障可能为 A.R1短路 B.R1断路 C.R2短路 D.R2断路 3故障排除重新连接后小芳先用10Ω的定值电阻进行实验闭合开关后移动滑动变阻器的滑片此时电流表的示数如图2所示记下此时电阻的阻值和对应的电流值.小芳断开开关将10Ω的定值电阻换成了15Ω的定值电阻然后准备闭合开关再向选填“左”或“右”移动滑片直至电压表示数与上一次电压表示数相同.但同组同学立即制止了她的做法认为在实验操作上须更加规范即接下来的操作应该是 4小芳可供选择的定值电阻的阻值为5Ω10Ω15Ω20Ω30Ω40Ω和50Ω.该同学想尽量多测几组数据但她不能选用的定值电阻是
如图所示的四个电路中电源电压保持不变R0为已知阻值的定值电阻不能测出未知电阻Rx阻值的电路是
不等式组的最小整数解为A.-1 B.0 C.1 D.2
ItwasatleasttwomonthsbeforeChristmaswhennine﹣year﹣oldAlmieRosetoldherfatherandmethatshewantedanewbicycle.AsChristmasdrewnearerherdesireforabicycleseemedtodieorsowethought.Weboughtsomelovelydollsandadollhouse.ThenmuchtooursurpriseonDecember23rdshesaidthatshereallywantedabikemorethananythingelse. ItwasjusttoolatewithallthedetailsofpreparingChristmasdinnerandbuyinglastminutegiftstotakethetimetoselecttherightbikeforourlittlegirl.ItwasChristmasEvearound900pm.Almieandhersix﹣year﹣oldbrotherDylanlaycomfortablyintheirbeds.Nowwecouldonlythinkofthebicycleandthedisappointmentofourchild.WhatifImakealittlebicycleoutofclay黏土andwriteanotethatshecouldtradetheclaymodelforarealbike?herdadasked.Thisisanexpensiveitemandsheis‘suchabiggirl'itwouldbemuchbetterforhertopickitout.Sohespentthenextfourhourspainstakingly尽心地workingwithclaytomakeatinybike. OnChristmasmorningwewereexcitedforAlmietoopenthelittleheart﹣shapedpackagewiththebeautifulredandwhiteclaybikeandthenote.Finallysheopeneditandreadthenotealoud.DoesthismeanthatItradethisbikethatDaddymademeforarealone?BeamingIsaidYes.AlmiehadtearsinhereyeswhensherepliedIcouldnevertradeinthisbeautifulbicyclethatDaddymademe.I'dratherkeepthisthangetarealbike.Atthatmomentwewouldhavemovedheavenandearthtobuyhereverybicycleontheplanet! 1IntheendAlmie'sparentsfailedtobuyheranewbicycleasaChristmasgiftbecause. A.herdesireforabicycledisappearedgradually B.theythoughtdollsweremoresuitableforherthanabike C.shepreferredthebikemadeofclay D.herparentshadnotimetoselectarightbikeforher 2Whatcanbeinferredfromthelastsentenceofthetext? A.Theparentswerehappyandencouraged. B.Theparentsfeltcomfortableandrelaxed. C.Theparentsweremovedandfeltproudofthegirl. D.Theparentsfeltdisappointedandsorryforthegirl. 3Whatisthebesttitleforthetext? A.ALovelyLittleGirl. B.AGreatandConsiderateFather. C.AClayBike. D.AnUnforgettableChristmasEve.
AD是△ABC的中线E是AD上一点AEED=13BE的延长线交AC于FAFFC=A.13 B.14 C.15 D.16
I'mMartha.Mymiddleschoolhadatraditioncarriedouteveryyearduringtheeighth﹣gradegraduationabeautifulgoldandgreenjacketwasgivenasaprizetothestudentwhohadkeptthehighestgradesforeightyears.Iwasfourteenandintheeighthgrade.IhadbeenastraightAstudent全优生sincethefirstgradeandthislastyearIhadlookedforwardverymuchtoowningthatjacket.OneafternoonwhenIwasonmywaytothegymIsuddenlyrememberedmyP.E.shortswereleftinthebagundermydesk.SoIwentbackandgetthem.IwasalmostbackatmyclassroomdoorwhenIheardvoicesraisedinangerasifinsomesortofargument.IrecognizedthevoicesMr.SmithmyhistoryteacherandMr.Brownmymathteacher.Theyseemedtobearguingaboutme.'Irefusetodoit!Idon'tcarewhoherfatherishergradesdon'tevenbegintocomparetoMartha's!'ThatwasMr.Smithandhesoundedveryangry.Mr.Brown'svoicesoundedcalmandquiet.'Look.Joann'sfatherisnotonlyontheBoard董事会heownstheonlystoreintown'Thepoundinginmyearskeptouttherestofthewordsonlyawordhereandtheregotthrough.'MarthaisMexicanimpossiblewon'tdoit'TothisdayIdon'trememberifIgotintroubleinP.E.forbeinglateorhowImadeitthroughtherestoftheafternoon.ThenextdayIwastoldbytheheadmasterthattherehadbeenachangeinpolicythisyearthatwhoeverwasawardedthejacketwouldbechargedfifteendollarsandiftheprizewinnerwasunabletopaythemoneyitwouldbegiventothenextoneinline.Thatwasunfair!IcriedallthewayhomesobythetimeIgothomemyeyeswereredandpuffy肿大的.IwenttoDadwhowasworkinginthebeanfield.Hesawmyshadowandlookedup.注意1.所续写短文的词数应为150左右2.至少使用5个短文中标有下划线的关键词语3.续写部分分为两段每段的开头语已为你写好4.续写完成后请用下划线标出你所使用的关键词语.Paragraph1Hewaitedformetospeak.﹣﹣﹣﹣Paragraph2Itwasaverysadandupsetgirlwhodraggedintotheheadmaster'sofficethenextday.﹣﹣﹣﹣
如图在△ABC中AB=AC=5BC=6AD为BC边上的高过点A作AE∥BC过点D作DE∥ACAE与DE交于点EAB与DE交于点F连结BE.求四边形AEBD的面积.
如果⊙O的直径为12cm直线l和圆只有一个公共点那么圆心到直线的距离为.
如图当闭合开关S后滑动变阻器的滑动片P向右移动时
某同学设计了一个电子身高测量仪如左下图所示R是定值电阻R'是滑动变阻器电源电压不变滑片会随身高上下平移.为了能够实现身高越高电压表示数越大请你帮助他将电压表接入电路.
如图BC平分∠ABDAB=9BD=25当BC=时△ABC∽△CBD.
如图所示有三种卡片其中边长为a的正方形1张边长为ab的矩形卡片4张边长为b的正方形4张用这9张卡片刚好能拼成一个正方形则这个正方形的面积为
如图所示物体AB上的B点在平面镜里所成的像点为B'在图中画出平面镜的位置和物体AB在平面镜中的像A'B'.
先化简再求值其中a=3b=2
在如图18-K-2所示的伏安法测电阻实验中闭合开关S小明发现电流表有示数但示数较小小灯泡不亮.接下来应进行的操作是
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