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双曲线的两个焦点为F1,F2,以F1F2为边作正方形F1F2MN,且此双曲线恰好经过边F1N和F2M的中点,则此双曲线的离心率为 .
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高三下学期数学《》真题及答案
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已知F.1F.2是双曲线的两个焦点过F.1作垂直于x轴的直线与双曲线相交一个交点为P.则|PF2|=
6
4
2
1
双曲线的渐近线为正方形OABC的边OAOC所在的直线点B为该双曲线的焦点若正方形OABC的边长为2
已知F.1F.2是双曲线C.:a>0b>0的左右两个焦点P.是C.上一点若│PF1│+│PF2│=6
双曲线-=1a>0b>0的渐近线为正方形OABC的边OAOC所在的直线点B.为该双曲线的焦点.若正方
F1F2为两个分力两者之间的夹角为F1与F2的合力为F则F=
A
B
C
D
一正方形截面梁分别受F1和F2作用且F1=F2如图所示则弯曲平面内的刚度关系为
(a)>(b)
(a)=(b)
(a)<(b)
不能确定
已知双曲线-=1a>0b>0的两个焦点为F.1F20点P.是第一象限内双曲线上的点且tan∠PF1F
已知F1F2是双曲线的两个焦点以线段F1F2为边作正方形MF1F2N若MN都在该双曲线上则该双曲线
已知两个力F1F2F1=300NF2=400N且F1与F2夹角为90°求合力R 的大小
已知F1F2是双曲线﹣=1a>0b>0的两个焦点以线段F1F2为边作正△MF1F2若边MF1的中点在
F1F2为两个分力两者之间的夹角为αF1与F2的合力为F则F=
本题共有2个小题第1小题满分6分第2小题满分8分 双曲线的左右焦点分别为F1F2直线l过F2且与双
已知椭圆+=1a>b>0的左右焦点分别为F1F2短轴的两个端点为A.B.且四边形F1AF2B是边长为
计算题已知两个力F1F2F1=300NF2=400N且F1与F2夹角为90°求合力R的大小
已知F.1F2是双曲线的两个焦点以线段F.1F2为边作正三角形MF1F2若边MF1的中点在此双曲线上
已知双曲线-=1b∈N*的左右两个焦点为F.1F.2P是双曲线上的一点且满足|PF1||PF2|=|
如图所示F1F2是双曲线a>0b>0的两个焦点以坐标原点O.为圆心|OF1|为半径的圆与该双曲线左支
,B,且ΔF2AB是等边三角形,则双曲线的离心率为 A.
( )
双曲线a>0b>0的两个焦点为F1F2若点P为其上一点且|PF1|=2|PF2|则双曲线离心率e的取
e
1<e<3
e
1<e≤3
e
e>3
e
e≥3
如图所示圆锥体重为G悬浮在水中时受到水对它向上的压力为F1向下的压力为F2这两个力之间的关系是:
F1> F2 ;
F1=F2;
F1 <F2;
无法判断.
双曲线 b∈N+的焦点是F1F2P是双曲线上的一点满足|OP|<5且|PF1||F1F2||PF2
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-5xy2的系数是次数是
的系数是次数是
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.
A是一个两位数已知十位数字为b则个位数字是.
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
研究电流与电压电阻的关系时实验分“保持电阻不变”和“保持电压不变”两步进行在“保持电阻不变”这一步实验时应该
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
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
计算-22003+-22002
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.
计算-1.25××8-9÷-12
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.
计算-16÷-22-22×-
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'.
求代数式的值4x2+3xy-9其中x=2y=-3.
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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