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三数成等差数列，和为6，适当排列后，成等比数列，则此三数之积为 ．
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高二上学期数学《》真题及答案
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若抛物线 y 2 = 2 p x p > 0 上三个点的纵坐标的平方成等差数列那么这
成等差数列
既成等差数列又成等比数列
成等比数列
既不成等比数列也不成等差数列
某数列既成等差数列也成等比数列那么该数列一定是
公差为0的等差数列
公比为1的等比数列
常数数列1，1，1…
以上都不对
三个正数abc成等比数列则lgalgblgc是
等比数列
既是等差又是等比数列
等差数列
既不是等差又不是等比数列
有四个数前三个数成等比数列其和为19后三个数为等差数列其和为12求此四个数
下列说法①公差为0的等差数列是等比数列②b2＝ac则abc成等比数列③2b＝a＋c则abc成等差数列
0个
1个
2个
3个
已知数列的前n项和那么数列
是等差数列但不是等比数列
是等比数列但不是等差数列
既是等差数列又是等比数列
既不是等差数列也不是等比数列
设﹣6ab三数成等差数列ab54三数成等比数列求ab之值
不相等的三个正数abc成等差数列并且x是ab的等比中项y是bc的等比中项则x2b2y2三数
成等比数列而非等差数列
成等差数列而非等比数列
既成等差数列又成等比数列
既非等差数列又非等比数列
设2a=32b=62c=12则数列abc成
等差数列
等比数列
非等差也非等比数列
既等差也等比数列
数列中成等差数列;成等比数列的倒数成等差数列.则①成等差数列;②成等比数列;③的倒数成等差数列;④的
在3和一个未知数间填上一个数使三数成等差数列若中间项减去6则成等比数列此未知数是.
数列中成等差数列;成等比数列的倒数成等差数列.则①成等差数列;②成等比数列;③的倒数成等差数列;④的
设那么
既是等差数列，又是等比数列
既不是等差数列，也不是等比数列
是等比数列，但不是等差数列
是等差数列，但不是等比数列
公差为0的等差数列是等比数列公比为的等比数列一定是递减数列abc三数成等比数列的充要条件是b2=a
1个
2个
3个
4个
若抛物线y2＝2pxp>0上三个点的纵坐标的平方成等差数列那么这三个点到抛物线焦点F.的距离的关系是
成等差数列
既成等差数列又成等比数列
成等比数列
既不成等比数列也不成等差数列
若ab是函数fx=x2-px+qp>0q>0的两个不同的零点且ab-2这三个数可适当排序后成等差数列
互不相等的三个正数x1x2x3成等比数列且点P1logax1logby1P2logax2logby2
等差数列，但不成等比数列
等比数列而非等差数列
等比数列，也可能成等差数列
既不是等比数列，又不是等差数列
已知三个数成等差数列它们的和为15如果它们分别加上139就成等比数列求这三个数．
有四个数前三个数成等差数列后三个数成等比数列首末两项之和为37中间两项之和为36求这四个数
若数列{an}是等比数列则数列{an+an+1}
一定是等比数列
可能是等比数列，也可能是等差数列
一定是等差数列
一定不是等比数列
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Failureisprobablythemostexhaustingexperienceapersoneverhas.Thereisnothingmoretiringthannotsucceeding. Weexperiencethistirednessintwowaysasstart﹣upfatigue疲惫andperformancefatigue.Inthe formercasewekeepputtingoffataskbecauseithaseithertooboringortoodifficult.Andthelongerwedelayitthemoretiredwefeel. Suchstart﹣upfatigueisveryrealevenifnotactuallyphysicalnotsomethinginourmusclesandbones.Thesolutionisobviousthoughperhapsnoteasytoapplyalwayshandlethemostdifficultjobfirst. YearsagoIwasaskedtowrite102essaysonthegreatideasofsomefamousauthors.ApplyingmyownruleIdeterminedtowritetheminalphabeticalorderneverlettingmyselfleaveoutatoughidea.AndIalwaysstartedtheday'sworkwiththedifficulttaskofessay﹣writing.Experienceprovedthattheruleworks. Performancefatigueismoredifficulttohandle.Thoughwillingtogetstartedwecannotseemtodothejobright.Itsdifficultiesappearsogreatthathoweverhardweworkwefailagainandagain.InsuchasituationIworkashardasIcan﹣thenlettheunconscioustakeover. WhenplanningEncyclopediaBritannicaIhadtocreateatableofcontentsbasedonthetopicsofitsarticles.NothinglikethishadeverbeendonebeforeanddayafterdayIkeptcomingupwithsolutionsbutnoneofthemworked.Myfatiguebecamealmostunbearable. OnedaymentallyexhaustedIwrotedownallthereasonswhythisproblemcouldnotbesolved.Itriedtoconvincemyselfthatthetroublewaswiththeproblemitselfnotwithme.RelievedIsatbackinaneasychairandfellasleep. AnhourlaterIwokeupsuddenlywiththesolutionclearlyinmind.Intheweeksthatfollowedthesolutionwhichhadcomeupinmyunconsciousmindprovedcorrectateverystep.ThoughIworkedashardasbeforeIfeltnofatigue.Successwasnowasexcitingasfailurehadbeendepressing. HumanbeingsIbelievemusttrytosucceed.Successthenmeansneverfeelingtired. 1Peoplewithstart﹣upfatiguearemostlikelyto. A.acceptfailure B.workhard C.seekhelp D.delaytasks 2Whatdoestheauthorrecommenddoingtopreventstart﹣upfatigue? A.Doingthingsinstrictorder. B.Buildingupphysicalstrength. C.Leavingoutthetoughestideas. D.Dealingwiththehardesttaskfirst. 3Onwhatoccasiondoesapersonprobablysufferfromperformancefatigue? A.Beforestartingadifficulttask. B.Whenallthesolutionsfail. C.Ifthejobisratherboring. D.Afterfindingawayout. 4Whatcouldbethebesttitleforthepassage? A.SuccessIsBuiltuponFailure B.HowtoHandlePerformanceFatigue C.GettingoverFatigueAWaytoSuccess D.FatigueAnEarlySignofHealthProblems
Thewindwassuchstrongthatwecouldhardlyopenoureyes.
FiveyearsagowhenItaughtartataschoolinSeattleIusedTinkertoysasatestatthebeginningofatermtofindoutsomethingaboutmystudents.IputasmallsetofTinkertoysinfrontofeachstudentandsaidMakesomethingoutoftheTinkertoys.Youhave45minutestodayand45minuteseachdayfortherestoftheweek.Afewstudentshesitatedtostart.Theywaitedtoseetherestoftheclasswoulddo.Severalotherscheckedtheinstructionsandmadesomethingaccordingtooneofthemodelplansprovided.Anothergroupbuiltsomethingoutoftheirownimaginations. OnceIhadaboywhoworkedexperimentallywithTinkertoysinhisfreetime.Hisconstructionsfilledashelfintheartclassroomandagoodpartofhisbedroomathome.Iwasdelightedatthepresenceofsuchastudent.Herewasanexceptionallycreativemindatwork.HispresencemeantthatIhadanunexpectedteachingassistantinclasswhosecreativitywouldinfect感染otherstudents. Encouragingthiskindofthinkinghasadownside.Irantheriskoflosingthosestudentswhohadadifferentstyleofthinking.WithoutfailonewoulddeclareButI'mjustnotcreative. Doyoudreamatnightwhenyou'reasleep? Ohsure. Sotellmeoneofyourmostinterestingdreams.Thestudentwouldtellsomethingwildlyimaginative.Flyingintheskyorinatimemachineorgrowingthreeheads.That'sprettycreative.Whodoesthatforyou? Nobody.Idoit. Really﹣atnightwhenyou'reasleep? Sure. Trydoingitinthedaytimeinclassokay? 1TheteacherusedTinkertoysinclassinorderto. A.knowmoreaboutthestudents B.makethelessonsmoreexciting C.raisethestudents'interestinart D.teachthestudentsabouttoydesign 2WhatdoweknowabouttheboymentionedinParagraph3? A.Helikedtohelphisteacher. B.Hepreferredtostudyalone. C.Hewasactiveinclass. D.Hewasimaginative. 3WhatdoestheunderlinedworddownsideinParagraph4probablymean? A.Mistake. B.Disadvantage. C.Difficulty. D.Burden. 4Whydidtheteacheraskthestudentstotalkabouttheirdreams? A.Tohelpthemtoseetheircreativity. B.Tofindoutabouttheirsleepinghabits. C.Tohelpthemtoimprovetheirmemory. D.Tofindoutabouttheirwaysofthinking.
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.错误仅涉及一个单词的增加删除或修改.增加在缺词处加一个漏字符号∧并在其下面写出该加的词.删除把多余的词用斜线\划掉.修改在错的词下划一横线并在该词下面写出修改后的词.注意1.每处错误及其修改均限一词2.只允许修改10处多者从第11处起不计分. Dearfriends Howtimeflying!Thetwo﹣weekexchangeprogramhascometotheend.Lookingbackatthepastdayswearegladtosaywehavebeenbenefitedalotfromtheprogram. InthepasttwoweekswecommunicatedwitheachotherfacetofaceinEnglish.NotonlyhavewemadegreatprogressesinouroralEnglishbutwealsohavelearnedmoreaboutyourculture.Besideswewillneverforgetthefarewellpartythatweenjoyedyourpassionatesongsanddancesaswellasthedelicioustraditionallyfoodofyourcountry.Thetimewespenttogetheristoounforgettablethatwewillvaluethemforever. Wedohopetomeetyouagaininthenearfuture!
Incaseyoufeelnervousduringtheinterviewyoucanmakefullpreparations. A.inreturn B.intime C.incommon D.inadvance
Dozensof志愿者havecometohelpthosesufferingfromtheearthquakes.
假如你叫王平根据图表提示给你的加拿大网友Smith写一封信介绍你的寒假生活共20天可根据自己的实际情况添加细节. 注意1.词数100左右2.开头已经给出不计入总词数. DearSmith Howareyou?Howtimeflies!NowthewintervacationwasoverandIhavecomebacktoschoolagain. Yours WangPing
Asalawyerhemustbeabletoargue逻辑地.
HowtoLiveaHappyLife Happinessiswhatweneedmostwiththeincreaseofpressureinmodemlife.1Fortunatelythisisnotthecase.Everyonehastheabilitytohangontohappinesswithhisownefforts.Thefollowingmethodsmayleadyoutolong﹣lastinghappiness. •Takeexercise.Otherthanhealthbenefitsthataretoonumeroustomentionexercisemakesyousmarterhappierimprovessleepandmakesyoufeelbetteraboutyourbody.2Keepingintouchwithnaturecanhelpyoureducestressmakeyoumorecreativeimproveyourmemoryandmayevenmakeyouabetterperson. •3Relationshipsareworthmorethanyouthink.Notfeelingsociallyconnectedcanmakeyoustupiderandkillyou.Lonelinesscanleadtoheartattackstroke中风anddiabetes肥胖症.Ontheotherhandstudieshaveshownthatthelongestlivedpeopleontheplanetallplaceastrongemphasisonsocialengagement. •ChallengeYourself.4Musiclessonsincreaseintelligence.Challengingyourbeliefsstrengthensyourmind.Increasingwillpowerjusttakesalittleefforteachdayandit'smoreresponsibleforyoursuccessthanIQ.Notgettinganeducationortakingadvantageofopportunitiesaretwoofthethingspeoplelookbackontheirlivesandregretthemost. •Laugh.Laughterhassimilareffectstophysicalexercise.Itincreasesbloodpressuretheheartrateandtherateofbreathingitalsoworksseveralgroupsofmusclesinthefacethestomachandthefeet.Itcanevenreducetheeffectofpainonthebody.Humorisagoodwaytocauselaughter.5 A.Lifeisalwaysfullofhope. B.Spendtimewithfriendsandfamily. C.Howeversometimesitseemsfarawayfromus. D.Itwouldbebetterifyoutakeexerciseinnature. E.Dosomethingkindforthepeopleyoucareabout. F.Learninganotherlanguagecankeepyourmindsharp. G.Justthinkingaboutfunnymomentsorthingscanhelpalot.
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