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作图题：在∠ABC内找一点P，使它到∠ABC的两边的距离相等， 并且到点A、C的距离也相等．（写出作法，保留作图痕迹）
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如图利用尺规在平面内确定一点O使得点O到△ABC的两边ABAC的距离相等并且点O到BC两点的距离也
作图题如图已知∠AOB和C.D.两点求作一点P.使PC=PD且P.到∠AOB两边的距离相等.尺规作图
如图已知△ABC求作一点P.使P.到∠A.的两边的距离相等且PA=PB.要求尺规作图并保留作图痕迹.
如图已知△ABC求作一点P.使P.到∠A.的两边的距离相等且PA=PB.要求尺规作图并保留作图痕迹.
如图在边长为1个单位长度的小正方形组成的网格中按要求作图.1利用尺规作图在AC边上找一点D.使点D.
尺规作图请按下面的要求作出符合条件的点保留作图痕迹不写作法1如图1E.F.分别是△ABC.的边ABA
尺规作图不写作法保留作图痕迹在△ABC的形内求作一点P.使得点P.到A.B.两点的距离相等到ABAC
如图在边长为1个单位长度的小正方形组成的网格中按要求作图.1利用尺规作图在AC边上找一点D.使点D.
如图已知△ABC求作一点P.使P.到∠A.的两边的距离相等且PA＝PB.要求尺规作图并保留作图痕迹.
如图已知△ABC中1只用直尺没有刻度和圆规求作一点P.使点P.同时满足下列两个条件到三角形各边的距离
求作一点P.使其到A.B.两点的距离相等且到∠MON两边的距离相等.只要保留作图痕迹说明所求作的点不
作图题已知△ABC如图求作一点P使点P到ABAC两边的距离相等并且点P到AB两点的距离也相等保留作
已知∠ACB=90°P为平面ABC外一点PC=2点P到∠ACB两边ACBC的距离均为那么P到平面A
如图在△ABC中点P是AC上一点连接BP求作一点M使得点M到AB和AC两边的距离相等并且到点B和点
如图已知△ABC中1只用直尺没有刻度和圆规求作一点P.使点P.同时满足下列两个条件保留作图痕迹不必写
作图题在∠ABC内找一点P使它到∠ABC的两边的距离相等 并且到点AC的距离也相等．写出作法保留
如图在△ABC中点P是AC上一点连接BP求作一点M使得点M到AB和AC两边的距离相等并且到点B和点
作图题在∠ABC内找一点P使它到∠ABC的两边的距离相等 并且到点AC的距离也相等．写出作法保留
1如图试用直尺与圆规在平面内确定一点O使得点O到Rt△ABC的两边ACBC的距离相等并且点O到AB两
△ABC中点O.是△ABC内一点且到△ABC三边的距离相等∠A.=40°则∠BOC=________
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Herattractivelipsseemedtospeakwordsofkindnesswhilehereyesappearedtoseek寻找outthegoodinpeople.Youhavetwohandsoneforhelpingyourselftheotherforhelpingothers.Sheusedtosay. ItwasforthisrarecharmandinnerbeautythatBritishmoviestarAudreyHepburn1929﹣1993wasnamedthemostnaturallybeautifulwomanofalltimeinJune2004. Herskinlooksfreshinallherfilmsandherwarmandlivelypersonalityreallyshinesthroughsaidonebeautyexpert. LifewasnevereasyforHepburn.Shortlyafterherparents'painfuldivorcewhenshewasnineshefoundherselfintheNetherlandsatthestartofWorldWarII.Hepburnwatchedhelplesslyasseveralofherrelativeswerekilled.Shesurvivedbyeatingtulipbulbsandcarriedsecretmessagesfortheresistanceinherballetshoes. Shedreamedofbecomingaballetdancerbutwastoldshewastootallandnottalentedenoughtobeasuccess. Hepburnthenturnedtomusicalsandspentmostofhertimeasachorusgirl舞女.ShehadsomesmallmovierolesbutitwasnotuntilRomanHoliday1953thatshebecameastar.WithhergoodmannersanddelicatefigureshewasperfectintheroleofaEuropeanprincess.ShetooktheBestActressOscarforherperformance. In1988Hepburnbeganhermostimportantrole﹣asaGoodwillAmbassador大使forUNICEFUnitedNationsChildren'sFund.Shetraveledtothepoorestplacesdoingherbesttoprovidecareandcreateawarenessofthedifficultsituationsinwhichsomechildrenlive. WhenHepburnpassedawayamessagedisplayedatherfuneralreadInlosingAudreytheworldnotonlylostamoviestarwelostaprincessanangelapersonwhoinspiredusallandwhoseselflessandlovingexamplesshallalwaysberemembered. 1WhenHepburnbegantoactasaGoodwillAmbassadorforUNICEFhowmanyyearshadpassedsinceherparents'divorce? A.50 B.52 C.38 D.46 2Whatisthepurposeofthelastparagraph? A.TotellreadersaboutAudreyHepburn'sdeath. B.TothinkhighlyofAudreyHepburn'swholelife. C.TotellreadersthemessagedisplayedatAudreyHepburn'sfuneral. D.TosaygoodbyetoAudreyHepburn. 3WhichofthefollowingbestdescribesAudreyHepburn'slife? A.Difficultandlucky. B.Miserableandsmooth. C.Hardandsuccessful. D.Easyandsmooth. 4Whatwouldbethebesttitleforthepassage? A.BeautyIsNotJustSkinDeep. B.BeautyIsJustSkinDeep. C.BeautyNeverStaysForever. D.AWorld﹣famousBeautyexpert
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在平面直角坐标系中直线l的参数方程为其中t为参数．现以坐标原点为极点x轴的非负半轴为极轴建立极坐标系曲线C的极坐标方程为ρ=6cosθ． 1写出直线l的普通方程和曲线C的直角坐标方程 2若点P坐标为-10直线l交曲线C于AB两点求|PA|+|PB|的值．
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计算log43+1og83log32+log92=
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A.womanheldherphonetightlytoherheartthewayachurch﹣goermightholdaBible.Shewasanxioustotakeapictureofanimpressivebunchofflowersthatsatnotsofarawaybutfirstshehadtogetthroughacrowdofotherspushingtheirwaytodothesame.ThecauseofthiswasBouquetstoArtoneofthemostpopulareventsatthedeYoungMuseuminSanFrancisco. Flowersellerswereaskedtocreateflowerarrangementsthatrespondtopiecesofartondisplayfromancientcarvingstocontemporarysculptures.It'sextremelyattractiveandalsomemorabletothepointthatithasbecomeaproblem. InrecentyearsthedeYoungreceivedmorethanathousandcomplaintsfrompeoplewhofeltthatcellphoneshadspoiledtheirexperienceoftheexhibit.institutionsoffineartaroundtheworldfacesimilarproblemsasthedesiretotakephotographsbecomesahugeattractionformuseumsaswellassomethingthatupsetssomeoftheirpatrons资助人.SothedeYoungrespondedwithakindofcompromisecarvingoutphotofreehoursduringtheexhibition'ssix﹣dayrun. Onecommoncomplaintabouttheeffectofsocialmediaonmuseumcultureisthatpeopleseemtobemissingoutonexperiencesbecausetheyaresobusycollectingevidenceofthem.AstudyrecentlypublishedinthejournalPsychologicalSciencesuggeststhereissometruthtothis.Itfindsthatpeoplewhokeeptakingphotosofanexhibitandpostingthemonsocialmediaratherthansimplyobservingithaveahardtimerememberingwhattheysee.Buttheissueiscomplexfortheprofessionalsrunningmuseums.LindaButlerthedeYoung'sheadofmarketingandvisitorexperienceacknowledgesthatnoteveryonewantsamuseumtobeaphoto﹣takingplayland.Yetalotofpeopledo‑andshebelievesthatthedeYoungisinnopositiontojudgeonereasonforbuyinga＄28tickettobemorevalidthananother.Ifweremovedsocialmediaandphotographyshesayswewouldriskbecomingirrelevant. 1WhatwasthewomaneagertodoaccordingtoParagraph1? A.Togetherphone. B.Totakeaphoto. C.Toescapethecrowd. D.Topushahead. 2HowdidthedeYoungrespondtothedilemma? A.Bysettingperiodswithoutphoto﹣taking. B.Bymakingtheexhibitionfreeofcharge. C.Bycompromisingwiththegovernment. D.Byextendingthefreeexhibitionhours. 3Therecentstudyfindsthattheuseofsocialmediainmuseumsmay. A.uncoverthetruth B.playanegativerole C.accumulateevidence D.causemanycomplaints 4WhichofthefollowingmayLindaButlersupport? A.Cateringtovisitors. B.Reducingadmissionprices. C.Reservingjudgementinpublic. D.Banningsocialmediaandphotography.
一位母亲根据儿子3～9岁身高的数据建立了身高ycm与年龄x岁的回归模型为=7.19x+73.93用这个模型预测这个孩子10岁时的身高则正确的叙述是
QianZhongshuwas1Chinesescholarandwriter2knowforhiswitanderudition博学. DespitefailinginMathematicsQianwasaccepted3theDepartmentofForeignLanguagesunderTsinghuaUniversityin1929becauseofhisexcellent4performinChineseandEnglishlanguages.InTsinghuaHemethiswifeYangJiangwhowas5becomeasuccessfulplaywrightandtranslatorand6marryherin1935.InthesameyearQianreceivedgovernmentsponsorshiptofurtherhisstudiesabroad.TogetherwithhiswifeQianheadedfortheUniversityofOxfordinBritain.After7spendtwoyearsatExeterCollegehereceivedabachelorofliterature.HethenstudiedforonemoreyearintheUniversityofParisinFrancebeforereturningtoChinain1938. QianlivedinShanghaifrom1941to1945whichwasthenunderJapanese8occupy.Manyofhisworkswerewrittenorpublishedduringthisperiodoftime.Acollectionofshort9essayWrittenintheMarginsofLife写在人生边上10publishin1941.HismostcelebratedworkFortressBesiegedappearedin1947.OntheArtofPoetrywritteninclassicalChinesewasissuedin1948.
Prettyinpinkadultwomendonotrememberbeingsoobsessedwiththecolouryetitiswidespreadinouryounggirls'lives.Itisnotthatpinkinherently内在地badbutitissuchatinysliceoftherainbowandthoughitmaycelebrategirlhoodinonewayitalsorepeatedlyandfirmlyblendsgirls'identitytoappearance.Thenitpresentsthatconnectionevenamongtwo﹣year﹣oldsbetweengirlsasnotonlyinnocentbutasevidenceofinnocence.LookingaroundIdespairedattheextremelackofimaginationaboutgirls'livesandinterests. Girls'attractiontopinkmayseemunavoidablesomehowencodedintheirDNAbutaccordingtoJoPaolettianassociateprofessorofAmericanStudiesit'snot.Childrenwerenotcolour﹣codedatalluntiltheearly20thcenturyintheerabeforedomesticwashingmachinesallbabiesworewhiteasapracticalmattersincetheonlywayofgettingclothescleanwastoboilthem.What'smorebothboysandgirlsworewhatwerethoughtofasgender﹣neutraldresses.Whennurserycolourswereintroducedpinkwasactuallyconsideredthemoremasculinecolouradelicateversionofredwhichwasassociatedwithstrength.Bluewithitsintimations暗示oftheVirginMary圣母玛利亚constancyandfaithfulnesssymbolisedfemininity女性化.Itwasnotuntilthemid﹣1980swhenenlargedageandsexdifferencesbecameadominantchildren'smarketingstrategythatpinkfullycameintoitsownwhenitbegantoseeminherentlyattractivetogirlspartofwhatdefinedthemasfemaleatleastforthefirstfewcriticalyears. Ihadnotrealisedhowprofoundlymarketingtrendsinfluencedourperceptionofwhatisnaturaltorelativesincludingourcorebeliefsabouttheirpsychologicaldevelopment.TakingthetoddlerasanexampleIassumedthatphasewassomethingexpertsdevelopedafteryearsofresearchintochildren'sbehaviourwrong.ItturnsoutaccordingtoDanielCookahistorianofchildhoodconsumerismitwaspopularizedasamarketinggimmickbyclothingmanufacturersinthe1930s. Tradepublicationscounseled劝告departmentstoresthatinordertoincreasesalestheyshouldcreateathirdsteppingstonebetweeninfantwearandolderkids'clothes.Itwasonlyaftertoddler学步的小孩becamecommonshoppers'termthatitevolvedintoabroadlyaccepteddevelopmentalstage.Splittingkidsoradultsintoever﹣tiniercategorieshasprovedasafewaytoboostprofits.Andoneoftheeasiestwaystocutupamarketistomagnifygenderdifferences﹣orinventthemwheretheydidnotpreviouslyexist. 1Bysayingitis…therainbowline3Para1theauthormeanspink. A.shouldnotbethesolerepresentationofgirlhood B.shouldnotbeassociatedwithgirls'innocence C.cannotexplaingirls'lackofimagination D.cannotinfluencegirls'livesandinterests 2WhatdoesthewordencodeinPara.2referto? A.discovered B.programmed C.marked D.sealed 3Theauthorsuggeststhatourperceptionofchildren'spsychologicaldevelopmentwasmuchinfluencedby. A.themarketingofproductsforchildren B.theobservationofchildren'snature C.researchesintochildren'sbehavior D.studiesofchildhoodconsumption 4WemaylearnfromParagraph4thatdepartmentstoreswereadvisedto. A.focusoninfantwearandolderkids'clothes B.attachequalimportancetodifferentgenders C.classifyconsumersintosmallergroups D.createsomecommonshoppers'terms 5Itcanbeconcludedthatgirls'attractiontopinkseemstobe. A.clearlyexplainedbytheirinborntendency B.fullyunderstoodbyclothingmanufacturers C.mainlyimposedbyprofit﹣drivenbusinessmen D.wellinterpretedbypsychologicalexperts
Therehavealwaysbeenalotofcommonlybelievedbutfalseideasaboutbeingfatanddoingexercise.Somepeoplebelievethattheycan'thelpputtingonweightastheygetolderwhileothersholdthatiftheystopexercisingtheirmuscleswillturnintofat.Herearesomemoremyths I'llneverloseweight﹣Icomefromafatfamily Wrong!Whilewecan'tchangethebodytypewearebornwithwecan'tblameourgenesformakingusfat.There'splentyofevidencethatfatnessrunsinfamiliesandthemainreasonisthattheysharethesamehabitsofeatingtoomuchandexercisingtoolittle. IamfatbecauseIburncaloriesslowly Wrong!Fatnessisnotcausedbyaslowmetabolism新陈代谢.Infactalthoughfatpeopleconsumemoreenergythanslimpeopletheyalsofailtorealizehowmuchtheyeat!Keepingadiarycanhelpyouworkoutyourdailyfoodintakemoreaccurately. Exerciseisboring Wrong!Anythingwillbecomeboringifyoudoitrepetitively.Thekeyistodevelopabalancedandvariedprogrammethat'sfunaswellasprogressive.IfyouenjoyaSundaywalktakeadifferentroute.Ifyoudoyogatryataichiclass.Ifyoulikeswimmingsetyourselfadistanceortimechallenge. Nopainnogain Wrong!Exerciseisnotmeanttohurt.Indeedpainisyourbodytellingyousomething'swrongandcontinuingtoexercisecouldleadtoseriousinjury.Youmayexperiencemilddiscomfortasyoubegintoexerciseregularlybutthisisyourbodyadaptingtothepositivechangesinyourlifestyleandtheachesshoulddisappearrelativelyquickly.Iftheydon'trestandseekmedicaladvice. 1Whatdoestheauthorthinkaboutbeingfat? A.Itisthefamilygenesthatmakepeoplefat. B.Peoplearefatbecausetheyconsumetoolittleenergy. C.Adiaryofexercisecanpreventpeoplefrombecomingfat. D.Itistheconsequenceofpeople'sunbalancedlifestyle. 2Accordingtotheauthorhowcanwemakeexercisemoreinteresting? A.Bytakingvariedexercise. B.Bychoosingsimpleexercise. C.Bydoingregularexercise. D.Bystickingtooutdoorexercise. 3Whatisthepurposeofthepassage? A.Todeclaretheimportanceofkeepingfit. B.Toclarifysomemisconceptionsaboutfatnessandexercise. C.Toconfirmwhathaslongbeenbelievedaboutkeepingfit. D.Toexplainsomemedicalfactsaboutbeingfatanddoingexercise.
Somepigstendtobeoptimisticwhileothersaremorepessimisticaccordingtoanewresearchthatismeaningfultoanimalwelfare.ThestudypublishedinthejournalBiologyLettersisthefirsttoshowthatmoodandpersonalityinteractinananimalinfluencingjudgment. AsheraresearcherattheUniversityofNewcastle'sInstituteofNeuroscienceandherteamhousedgroupsofpigsintwotypesofenvironment.Onereflectedstandardcommercialconditionsandtheotherwascushierwithmorespaceandplentyofsoftdeepstraw.Afterthepigsgotaccustomedtothesenewhomesoverafewweekstheresearcherspicked18pigsfromeachtypetotrainandtesttheirjudgment. Todothiswetrainedeachpigthatinonecornerofatrainingroomtherewouldbeabowlwithchocolatesweets﹣pigslovethem﹣andattheoppositesideoftheroomtherewouldbeabowlcontainingcoffeebeanswhichpigsfindbitter﹣tastingaresearchersaid. Overanumberoftrainingtrialspigslearnedtogotothebowlreliablywhenitwasinthecornerwheretheyhadfiguredouttoexpectchocolatesweets.Onthecontrarytheyquicklylearnedtoavoidthebowlwhenitwasinthecornerwheretheywouldexpecttofindthecoffeebeans. Theresearchersnextplacedanunfamiliarbowlindifferentlocationstoseehowthepigswouldreact.Somegailydashedtothebowlnomatterwhatshowingoptimismthatitwouldcontaintheirfavoritesweets.Othershoweverbehavedasthoughtheyexpectedittocontaincoffeebeansdisplayingpessimism. Thefindingssuggestthataone﹣size﹣fits﹣allanswertoanimalwelfareissuesdoesnotexist.Evenifpigsarejustequaltobaconorothermeatforsomepeoplethereisstillcauseforconcern.Studieshavesuggestedthathowananimalistreatedduringitslifetimecandirectlyaffectmeatqualityandtaste. 1Whatwasthestudytryingtofigureout? A.Howtomakepigshappier. B.Thesimilaritiesbetweenhumansandpigs. C.Howlivingenvironmentaffectedpigs'mood. D.Howpigs'moodandpersonalityaffectedtheirjudgment. 2WhatdoestheunderlinedwordcushierinParagraph2mean? A.Simple. B.Morecomfortable. C.Unpractical. D.Lessfree. 3Whichbowlcantestwhetherapigisoptimisticorpessimistic? A.Thebowlwithchocolatesweets. B.Thebowlcontainingcoffeebeans. C.Thebowlfullofbothsweetsandbeans. D.Thebowlunfamiliartotwotypesofpigs. 4Whatdothefindingsofthenewresearchimply? A.Peopleshouldtreatpigsequally. B.People'shealthreliesonmeatquality. C.Peopleshouldmeetpigs'variousneeds. D.People'sattitudetowardpigsistotallywrong.
函数fx=的定义域为
MykidsandIwereheadingintothesupermarketovertheweekend.Onthewaywespottedamanholdingapieceofpaperthatsaid1myjob.FamilytoFeed. Atthisstorea2likethisisnotnormal.My10﹣year﹣oldnoticedhimandmakea3onhowbaditmustbetohavetostand4inthecoldwind. InthestoreIaskedeachofmykidsto5somethingtheythoughtourfriendtherewould6.Theygotapplesasandwichandabottleofjuice.Thenmy17﹣year﹣oldsuggestedgivinghima7.Ithoughtaboutit.Wewere8oncashourselvesbut…wellsometimes9fromourneedinsteadofourabundanceis10whatweneedtodo!Allthekids11somethingtheycoulddoawaywithfortheweek. Whenwehandedhimthebagof12helitupandthankeduswith13eyes.WhenIhandedhimthegiftcardsayinghecoulduseitfor14hisfamilymightneedheburstintotears. Thishasbeenawonderful15forourfamily.Fordaysthekidshavebeenlookingforotherswecan16!Thingswouldhaveplayedoutso17ifIhadsimplysaidNowereallydon'thave18togivemore.Steppingoutnotonlyhelpedabrotherin19italsogavemykidsthe20tasteofhelpingothers.It'llgoalongwaywiththem. 1A.Quit B.Changed C.Lost D.Finished 2A.condition B.place C.sight D.show 3A.suggestion B.comment C.decision D.call 4A.by B.proudly C.outside D.angrily 5A.draw B.say C.arrange D.pick 6A.appreciate B.supply C.order D.discover 7A.dollar B.job C.hotmeal D.giftcard 8A.easy B.low C.soft D.loose 9A.giving B.saving C.spending D.begging 10A.yet B.even C.still D.just 11A.declared B.shared C.ignored D.expected 12A.food B.medicine C.toys D.clothes 13A.sleepy B.watery C.curious D.sharp 14A.whoever B.whatever C.whichever D.whenever 15A.message B.example C.experience D.adventure 16A.relyon B.respect C.learnfrom D.help 17A.suddenly B.vividly C.differently D.perfectly 18A.time B.power C.patience D.money 19A.need B.love C.fear D.memory 20A.strong B.sweet C.strange D.simple
DidTheEarthMoveForYou? Eleven﹣year﹣oldAngelasufferedfromadiseaseinvolvinghernervoussystem.Shewasunableto1andhermovementwasrestrictedinotherwaysaswell.Thedoctorsdidnotholdoutmuch2ofhereverrecoveringfromthisillness.They3she'dspendtherestofherlifeinawheelchair.Theysaidthat4ifanywereabletocomebacktonormalaftercatchingthisdisease.Butthelittlegirlwasbraveandconfident.Therelyinginherhospitalbedshewould5toanyonewho‟dlistenthatshewasdefinitelygoingtobewalkingagainsomeday. ShewasthensenttoaspecializedrehabilitationhospitalintheSanFranciscoBayarea. Whatevertherapies治疗方法couldbe6tohercasewereused.Thingsdidn'tworkasthetherapistsexpected.Stilltheywerecharmedbyher7spirit.Theytaughtherabout 8﹣aboutseeingherselfwalking.Ifitwoulddonothingelseitwould9giveherhopeandsomething10todointhelongwakinghoursinherbed. Angelawouldworkashardaspossibleinphysicaltherapyinwhirlpoolsandinexercisesessions.Andsheworkedjustashardlyingthere11doingherimagingvisualizingherselfmovingmovingmoving! Onedayasshewastwistingwithallher12toimagineherlegsmovingagainitseemedasthougha13thinghappenedThebedmoved!Itbegantomovearoundtheroom!She14outLookwhatI'mdoing!Look!Look!I15it!Imoved! Ofcourseatthisverymomenteveryoneelseinthehospitalwasscreamingtooandrunningfor16.Peoplewerescreamingequipmentwas17andglasswasbreaking.YouseeitwastherecentSanFranciscoearthquake.Butdon‟ttellthattoAngela. She's18thatshedidit.Andnowonlyafewyearslatershe'sbackinschool. 19herowntwolegs.Nocrutches拐杖nowheelchair.YouseeanyonewhocanshaketheearthbetweenSanFranciscoandOaklandcanconqueralittledisease.Youneverknowwhat‟saroundthecorneruntilyoutakea20step. 1A.hear B.speak C.walk D.see 2A.pride B.hope C.regret D.pity 3A.predicted B.forgot C.denied D.promised 4A.some B.few C.many D.all 5A.apologize B.appeal C.refer D.swear 6A.applied B.appointed C.compared D.explained 7A.competitive B.independent C.sensitive D.undefeatable 8A.concentrating B.summarizing C.picturing D.sorting 9A.inadvance B.forsomereason C.onthecontrary D.atleast 10A.positive B.attractive C.familiar D.boring 11A.gratefully B.faithfully C.hopelessly D.royally 12A.might B.interest C.fame D.need 13A.normal B.magical C.funny D.simple 14A.found B.screamed C.turned D.counted 15A.understood B.refused C.made D.decided 16A.cover B.comfort C.freedom D.office 17A.exploding B.working C.self﹣repairing D.falling 18A.persuaded B.ashamed C.convinced D.worried 19A.By B.With C.On D.For 20A.cautious B.reasonable C.final D.further
欧拉公式eix=cosx+isinxi为虚数单位是由瑞士著名数学家欧拉发明的它将指数函数的定义域扩大到复数建立了三角函数和指数函数的关系它在复变函数论里占有非常重要的地位被誉为“数学中的天桥”根据欧拉公式可知e2i表示的复数在复平面中位于
执行如图程序框图若输入的x的值为1则输出的n的值为．
在各项均为正数的数列{an}中a1=a且an+1=． 1当a3=2时求a的值 2求证当n≥2时an+1≤an
下列函数是奇函数的是
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