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已知函数f(x)=-x3+2x-ex+e-x,若f(a2)+f(a-2)≥0,则实数a的取值范围是
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高二下学期数学《》真题及答案
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已知函数fx=若函数gx=x﹣a其中a∈R若函数y=fx﹣gx恰有3个零点则实数a的取值范围是
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已知函数fx=sinx+cosxf′x是fx的导函数.若fx=2f′x则=.
已知函数fx=x2+alnxa为实常数1若a=﹣2求证函数fx在1+∞上是增函数2求函数fx在[1e
已知函数fx=x3-ax2-3x.1若函数fx在区间[2+∞上是增函数求实数a的取值范围2若x=3是
已知函数fx为R.上的奇函数当x≥0时fx=xx+1.若fa=-2则实数a=________.
已知函数fx=是奇函数.1求实数m的值2若函数fx在区间[-1a-2]上单调递增求实数a的取值范围.
已知函数fx=alnx﹣xa>0.Ⅰ求函数fx的最大值Ⅱ若x∈0a证明fa+x>fa﹣xⅢ若αβ∈0
已知函数fx=lgx+1 1若02若gx是以2为周期的偶函数且当0≤x≤1时有gx=fx求函数y=
已知函数fx是定义在R.上的可导函数其导函数为f′x若对任意实数x有fx>f′x且y=fx﹣1的图象
已知函数fx是-∞+∞上的偶函数若对于x≥0都有fx+2=-fx且当x∈[02时fx=log2x+1
.已知函数fx=ax+lnxa<01若当x∈[1e]时函数fx的最大值为﹣3求a的值2设gx=fx+
已知函数fx=lgx+1.1若0<f1-2x-fx<1求x的取值范围2若gx是以2为周期的偶函数且当
已知函数fx=sinx+cosxf’x是f’x的导函数. 若fx=2f’x求的值.
已知函数fx=x2+4ax+2a+6.1若函数fx的值域为[0+∞求a的值2若函数fx的函数值均为非
已知函数fx=x2+alnxa∈R.1若函数fx在x=1处的切线垂直y轴求a的值2若函数fx在区间1
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已知函数fx=alnx+a∈R.1当a=1时求函数fx在[1+∞上的最小值2若fx存在单调递减区间求
已知函数fx=下列命题正确的是
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(x)是减函数
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对下列现象的微观解释不正确的是
已知ABCDE是教案备课库中常见的不同类别的物质.他们之间的关系如图所示“﹣”表示相邻的两物质可以发生反应“→”表示物质的转化关系部分反应物和生成物已省略.A是使用最广泛的金属C是常用的食品干燥剂E是配制波尔多液的主要成分之一其溶液为蓝色F也是教案备课库中常见的化合物且由三种元素组成.请回答下列问题 1C的俗名为. 2由B转化为E的化学方程式为. 3请写出物质D的一种用途. 4若EF反应能生成蓝色沉淀且F中的阳离子是K+则F的化学式为. 5上述反应中没有包含的基本反应类型是.
某化学兴趣小组获得两包制作“跳跳糖”的添加剂一包是柠檬酸晶体另一包是标注为钠盐的白色粉末.将少量柠檬酸和这种白色粉末溶于水混合后产生了使澄清石灰水变浑浊的气体为确定白色粉末的化学成分进行了以下探究 【提出猜想】猜想1.碳酸钠猜想2.碳酸氢钠猜想3.碳酸钠和碳酸氢钠. 【查阅资料】①碳酸钠溶液碳酸氢钠溶液均呈碱性 ②碳酸氢钠受热分解生成碳酸钠水和二氧化碳碳酸钠受热不分解. 【实验探究1】小亮小刚分别对有关猜想设计方案并进行实验 【实验质疑】 1小红认为小亮的实验结论不正确理由是.用文字叙述 2小明认为小刚的实验并不能得出猜想2成立理由是.用文字叙述 【实验探究2】为了进一步确定白色粉末的化学成分小戚称取10g白色粉末与足量稀盐酸反应充分反应后生成二氧化碳的质量为mg通过计算并分析实验数据确定猜想3成立则m的取谊范围为计算结果用分数表示. 【结论分析】探究后他们查到该白色粉末的成分为碳酸氢钠那么你认为白色粉末中的碳酸钠是如何产生的写出产生碳酸钠的化学方程式.
如图所示传送带的右边平滑对接倾角为30°的光滑固定的斜面左边对接固定的挡板传送带ab的长度l=2.0m它始终以v=3.0m/s的速度顺时针转动.现将一个可视为质点的小物体由c点静止释放bc距离L=1.4m小物体与传送带表面的动摩擦因数取g=10m/s2.求 1小物体运动到传送带的下端a点时的速率 2若小物体与挡板相撞时无机械能损失试通过计算说明小物体能否与挡板发生第二次相撞.
以下说法正确的是
Thetermtoextendanolive橄榄branchmeanstomakeanofferofpeaceorreconciliation和好.ThistermhasBiblicalshèng jīng 的originscomingfromthesectionoftheOldTestamentthatdealswiththefloodthesignthatthefloodisoverisanolivebranchbroughtbacktotheark方舟byadove.OlivebrancheswerealsosymbolsofpeaceinAncientGreeceandRomeandtheycontinuetobeusedinvariousworksofartthataremeanttosuggestpeace. Somepeoplehavesuggestedthattheolivewasaverydeliberateandwell﹣consideredchoiceasametaphor比喻forpeacebecauseolivetreesfamouslytakeyearstomature.Waristypicallyveryhardonthetreesbecausepeoplecannottakethetimetonurturethemandplantnewones.Thereforetheofferofanolivebranchwouldsuggestthatsomeoneistiredofwarwhetheritisanactualwarorafallingoutbetweenfriends. InAncientGreekandRomantimespeoplewouldofferactualolivebranches.InRomeforexampledefeatedarmiestraditionallycarriedolivebranchestoindicatethattheyweregivinginandtheGreeksusedthemintoweddingsandotherceremonies.Inthemodernerathebranchisusuallymetaphoricalratherthanactualnotleastbecausetheplantscanbeabitdifficulttoobtain. Manypeopleagreethatpeacenegotiationsatalllevelsofsocietyareagoodidea.Betweennationsobviouslyitisimportanttoextendanolivebranchtoensuremutualsafetyandtohelptheworldrunmoresmoothly.Thisactcanalsobeimportantonapersonallevelasresolvingconflictandlearningtogetalongwithothersisviewedasanimportantlifeskillinmanycultures. Atsomepointintheirlivesmanypeoplewillbeadvisedtoextendanolivebranchtosettleadisputeorresolveanissue.Somepeoplebelievethatittakesanimmenseamountofcouragetotakethisactionasitoftencomeswithanadmissionofwrongdoingandregret. 32.AccordingtotheBible. A.anolivebranchsuggestsfloodiscoming B.thearkismadeofolivetreewood C.anolivebranchmeansfloodisover D.adovelovestosettleontheolivebranch 33.TheoliveisconsideredagoodchoiceasametaphorforpeaceforthefollowingreasonsEXCEPT. A.olivetreesfamouslytakeyearstomature B.olivebranchesmakepeopletiredofwar C.waristypicallyveryhardonthetrees D.peoplecannottakethetimetonurturethemwhileatwar 34.Whyareactualolivebranchesseldomusedinmoderntimes? A.Olivetreesarebeingprotectednow. B.Olivetreesareplantedonlyincertaincountries. C.Olivetreescanbefartoseek. D.Thereisnoneedtouserealolivebranches. 35.Itcanbelearnedfromthetextthattoextendanolivebranch. A.isnotimportantonapersonallevel B.isonlyimportantbetweennations C.takesalotofcourage D.isanimportantlifeskillinmanycultures.
人类的活动离不开能源人类的生存离不开水资源. 1目前人们使用的主要能源是煤天然气.近年来科学家陆续发现海底埋藏着大量的将来可能会代替化石燃料的新能源这种新能源是. 2我国部分地区的饮用水来自河水河水在净化处理时加入明矾的作用是.在日常生活中若要鉴别净化后的水是硬水还是软水最简单的方法是加入进行检验.
假定你是李华是你校读书俱乐部的负责人计划在下个月组织英语读书节. 请给你的美国笔友Tony写信介绍本次活动并请他为本次读书节推荐阅读书目. 注意 1.词数100左右 2.可以适当增加细节以使行文连贯 3.信的开头和结尾已给出不计入总词数. DearTony Lookingforwardtoyourearlyreply! Yours LiHua.
设想在深太空探测中一个探测器到达深太空中的一颗外星球不考虑自传开始探测实验.首先测出在外星球近地环绕的周期为T着陆后竖直上抛一个小球用速度传感器测出上抛的初速度v用秒表测出落回抛出点的时间t则根据上述测量的量不能算出的物理量是
在竖直向上的匀强电场中有两个质量相等带异种电荷的小球AB均可视为质点处在同一水平面上现将两球以相同的水平速度v0向右抛出最后落在水平地面上运动轨迹如图所示两球之间的静电力和空气阻力均不考虑则
小明同学对所学的部分化学知识归纳如下其中的错误的是
下列叙述不正确的是
小亮用固体氯化钠配制80g溶质质量分数为10%的氯化钠溶液有关他的实验操作下列说法正确的是
如图是教案备课库中常见物质间的相互关系.其中ABCDE是五种不同类别的物质EF的类别相同CM的组成元素相同C呈固态时俗称“干冰”.图中“﹣”表示两端的物质间能发生反应“→”表示物质间存在转化关系反应条件部分反应物和生成物已略去. 1写出M的一种用途. 2写出B的化学式. 3写出F→D的化学方程式. 4写出E→D的实验现象. 5图示相互关系中没有涉及到的基本反应类型是.
根据下列图示回答相关问题 1氟的相对原子质量为氟元素的化学性质与图2中填字母序号化学性质相似. 2图3是某化学反应微观示意图.在点燃条件下A和B反应生成C和D. ①1个B分子中含有个原子.②A中氮元素和氢元素的质量比为. ③在该反应中生成C和D的质量比为.计算结果用最简整数比表示
如图所示电路中a点电势为3Vb点接地电阻R1R2=15电容器电容C为3pF开始时ap相接电路处于稳定状态.现在断开ap连接bp直至电路重新稳定则在这一过程中
MobilephonesandiPadsarenowwonderfultoolsforlearningandteachingEnglish.Withthehelpofthethousandsofeducationandlanguageappsavailableonlinestudentscanmakeeffectiveuseofthemtolearninaninteractiveenvironment.GivenbelowisalistofsomeofthebestappsforlearningandteachingEnglish. GrammarUp GrammaristheheartofanylanguageandthustheGrammarUpappisoneofthemosthighlyrecommendedappsforEnglishlearners.Thisappisspecificallydesignedforpeoplewhowanttoimprovetheirgrammarvocabularyandwordselection.Itconsistsofmorethan1800multiple﹣choicequestionsgroupedundertwentydifferentgrammarcategories. iFPoems iFPoemsisafantasticappforpoetrylovers.Thisappconsistsofagreatcollectionofpoemsfromfamouspoetsaroundtheworld.Italsoallowsuserstosavetheirfavoritesalongwithrecordingtheirownreadingsofthepoems. iBooks iBooksisacompletebooklibraryfortheiPadusers.ItincludestheiBookstoreandallowsuserstodownloadandreadbooks.Theappfeaturesabeautifulbookshelfonwhichyoucanbrowsevariousbooksorevenaddnotestoyourfavoriteparagraphsinthebook.Youcanalsocreateyourowntextsanduploadthemintotheapp. SpeakingPal RecommendedasoneofthebestappsforEnglisheducatorsandlearnersSpeakingPalallowsyoutorecordyourspeechandcompareitwithanativeEnglishspeaker.ThisamazingappcombinesvideowithautomaticspeechrecognitionsoftwarethattestsyourEnglishspeakingskills.YoujusthavetospeakwithavideocharacterandgetimmediateresponseonhowwellyouspeakEnglish. 21.Whatdotheseappshaveincommon? A.Theycanbefoundonline. B.Theyarefreeofcharge. C.Theyimproveusers'grammar. D.They'redesignedbyteachers. 22.WhatcanwedowithiBooks? A.Downloadbooksforfree. B.Writenotesonitwithpens. C.Savenotesandtexts. D.Createabookstore. 23.WhatisspecialaboutSpeakingPal? A.Itoffersvideocallservice. B.Itevaluatesusers'speech. C.Itofferstalkswithanativespeaker. D.ItincludesEnglishspeakingcontests.
InformationOverload Inmodernsocietyifwe'retryingtomakeadecisionweoftenhavesomuchinformationthatwegetconfusedandwedon'tknowwhattodo.Thisstateisknownasinformationoverload.36Itcancausestressfrustrationandreducedproductivity.Butwhatcanwedointhefaceofinformationoverload? •Planforonlyonetimeeachdaytochecke﹣mailsocialmessagingsiteschatroomsetc.Don'tallowyourselftocheckmultipletimesunlessyoutrulyarewaitingforanimportante﹣mail.37Andthateatsupyourvaluabletimebeforegettingaway. •Ifyouaresufferingfromtoomanyelectronicinterruptionsduringtheweekdayaskpeopletocallortextyouduringworkhoursonlyifit'sreallyanemergency.38 •Remindyourselfthatit'sokaytonotknoweverything.Infactit'simpossibletokeepupwiththepaceoftheinformationsuperhighway.Thesooneryouacceptthatthehappieryou'llbe.39Itisgoodtofallbehindontheinformationthatreallyisn'tworthyourattention. •40Setasidearegulartimeeachweekwhereyouandotherfamilymembersdonotuseanykindofelectronicmediatechnologiesincludingtelevision.Itcouldbesomethingyoudoeveryweekendorperhapsanhourortwoeveryevening. A.Justcatchupwiththehappiestmoment. B.Knowwhat'sworthknowingandwhatisn't. C.Almosteveryonesuffersfromittosomedegree. D.Spendtimewithyourfamilyfreefromelectronicproducts. E.Weneedtofindsomeeffectivewaystoprocesstheinformation. F.Eachtimeyougoonlineyouruntheriskofbeingaddictedtoit. G.Otherwisetheyandyouendupstealingtimefromyouremployer.
下列过程中一定发生化学变化的是
Abalanceddietmeansthenutritionofthreemealsinadayshouldbebalancedandbreakfastisveryimportanttoachievethatgoal.Skippingbreakfast61causedamagetohealthapartfromreducingworkperformance.62studyhaveshowedthatifapersondoesnoteatbreakfast63regularheorshewillbe64ahigherriskofvariousdiseases. Howevermanypeopledonoteatbreakfast.Arecentsurveyshowsthat8.6percentofpeopledonoteatbreakfasteveryday.Thesituationiseven65badinpoverty﹣strickenareas. Whilemostpeopleareusedto66eatbreakfastthequalityoftheirmealisinquestion.About25percentofpeopledonoteatahomemadebreakfast67morethan80percentofpeopledonotconsumeahealthybreakfast. Childrenwomenandpeoplelivinginpoverty﹣strickenareasaremostlikelytobeaffected68itcomestoeatingunhealthybreakfasts.Howeveroldpeople69ageabove60tendtohavehealthybreakfastbecausethisgroupmostlyretiredhavetimeand70patienttocookbreakfastthemselves.
请用化学用语填空. 13个镁离子 2氦气 3标出NH4NO3中加点元素的化合价.
Inagrarian农业的pre﹣industrialEuropeyou'dwanttowakeupearlystartworkingwiththesunrisehaveabreaktohavethelargestmealandthenyou'dgobacktoworksaysKenAlbalaaprofessorofhistoryattheUniversityofthePacific.Laterat5or6you'dhaveasmallersupper. Thiscomfortablecycleinwhichtherhythmsofthedayhelpedshapetherhythmsofthemealsgaverisetothecustomofthelargemiddaymealeatenwiththeextendedfamily.MealsarethefoundationofthefamilysaysCaroleCounibanaprofessoratMillersvilleUniversityinPennsylvaniasotherewasaveryimportantinterconnectionbetweeneatingtogetherandstrengtheningfamilyties. Sinceindustrializationmaintainingsuchaslowculturalmetabolismhasbeenmuchharderwiththelongmiddaymealshrinkingtowhatevercouldbestuffedintoalunchbucketorboughtatafoodstand.Certainlytherewerebenefits.Moderntechniquesforproducingandshippingfoodledtogreatervarietyandquantityincludingatremendousincreaseintheamountofanimalproteinanddairyproductsavailablemakingusmoreenergeticthanourancestors. Yetplentyhasbeenlosttooeveninculturesthatstilllivetoeat.TakeItaly.It'snosecretthattheMediterraneandietishealthybutitwasalsoajoytoprepareandeat.ItalianssaysCounihantraditionallybeganthedaywithasmallmeal.Thebigmealcameataround1p.m.Inbetweenthemiddaymealandalatesmallerdinnercameasmallsnack.Todaywhentimezoneshavelessandlessmeaningthereislittletoleranceforoffices'closingforlunchandworseningtrafficincitiesmeansworkerscan'tmakeithomeandbackfastenoughanyway.Sotheformerlysmallsupperaftersundownbecomesthebigmealofthedaytheonlyoneatwhichthefamilyhasachancetogettogether.TheeveningmealcarriesthefullburdenthatusedtobespreadovertwomealssaysCounihan. 24.WhatdoesProfessorCaroleCounihansayaboutpre﹣industrialEuropeanfamilieseatingmealstogether? A.Itwashelpfultomaintaininganation'stradition. B.Itbroughtfamilymembersclosertoeachother. C.Itwascharacteristicoftheagrarianculture. D.Itenabledfamiliestosavealotofmoney. 25.WhatdoesculturalmetabolismLine1Para.3referto? A.Evolutionaryadaptation. B.Changesinlifestyle. C.Socialprogress. D.Paceoflife. 26.Whatdoestheauthorthinkofthefoodpeopleeattoday? A.Itsqualityisusuallyguaranteed. B.Itisvariedabundantandnutritious. C.Itismorecostlythanwhatourancestorsate. D.Itsproductiondependstoomuchontechnology. 27.WhatdoestheauthorsayaboutItaliansoftheolddays? A.Theyenjoyedcookingaswellaseating. B.Theyateabigdinnerlateintheevening. C.Theyatethreemealsregularlyeveryday. D.Theywereexpertatcookingmeals.
图1是元素周期表的部分信息请根据下表回答有关问题 1具有相似化学性质的一组元素是. A.NaClB.CBeC.FClD.ClAr 2由第7号元素和第12号元素的原子形成化合物的化学式为. 3某粒子的结构示意图如图2当x﹣y=8时该粒子的符号为. 4钠氯氧三种元素可形成原子个数比为114的化合物则此化合物中氯元素的化合价为. 5具有相同原子数和电子数的分子或离子叫等电子体.下列各组粒子中属于等电子体的是. A.NO和O2B.CO和N2C.SO2和CO2D.NH4+和H2O
用如图所示的装置可验证机械能守恒定律直径为d的摆球A拴在长为L的不可伸长的轻绳一端L>>d绳的另一端固定在O点O点正下方摆球重心经过的位置固定光电门B.现将摆球拉起使绳偏离竖直方向θ角时由静止开始释放摆球当其通过最低位置时光电门B记录的遮光时间为t. 1摆球通过最低点的速度v=用题中字母表示 2写出满足机械能守恒的表达式用题中字母表示
Longschoolholidayshelpstudentscleartheirheadsrelaxalittleandstretchtheirbrainsindifferentways. Traditionallyschoolingscheduleshavelongbeenbasedmoreontheneedsofsocietythanonefficienteducationstrategies.ForinstanceinIcelanditwastraditionallyarrangedtoallowchildrentohelpoutwithharvest.Othercountrieshavelongsummervacationsbecauseitissimplytoohottostudy.Inotherareaswherereligionplaysanimportantroleintheholidayseasonthereligioncalendarthencallsforthebreaksothatstudentscanhaveampletimetoparticipateinthereligiousceremoniesandtraditionsofseasonalholidays. Therearesomeobviousadvantagestoavacationthatlastslonger.Familieswholivealongdistancefromrelativesareabletotraveltogethersometimesacrosstheoceaninordertoconnectwiththeirlovedones.Evenifthereisnovisitingfamilyfarawayalongholidayisagreatopportunityforkidstointeractwiththecommunity.Fromaneducationalpointofviewachildthatisabletoexperienceanotherculturecangainvaluablelanguagehistoryandsocialskills. Longschoolholidaysarealsoneededinschoolsthathavebecomeoverlyacademicandtooexam﹣focusedinrecentyearswhichrequiresaconsiderablylongerholidaybreakfromsuchamarathonpumping灌输ofknowledgeanditmakesgreatsense! GreatpsychologistslikeFreudandPiagethavestressedplay'scentralroleintheformationoffully﹣rounded全面发展的individualssothelongholidayachievesthisbyallowingstudentstoexploretheworldoutsideschool.Thestudentsgettoparticipateinactivitiesthatwouldbedifficulttododuringaregularschoolterm. Asaconsequencelongschoolholidaycanbequiteconstructivetoourstudents! 28.Whattraditionallydeterminesthearrangementofschoolholidays? A.Localneeds. B.Culturalactivities. C.Religiouscustoms. D.Academicperformance. 29.Whichisoneoftheadvantagesoflongholidays? A.Studentsrunawayfromexams. B.Childrencanlearnscienceandhistory. C.Fewercoursesarerequiredatschool. D.Familybondsarestrengthened. 30.FreudandPiagetmayprobablyagreethat. A.schoolsneedlongerholidays B.holidayactivitiesarenecessary C.playismoreimportantthanlearning D.studentsshouldtravelaroundtheworld 31.Whatisthebesttitleofthepassage? A.TraditionalSchoolHolidays B.ActivitiesforLongHolidays C.BenefitsofLongHolidays D.AdvicefromPsychologists.
一列波沿x轴正向传播t=0时刻的波形如图所示其中EF两点相对平衡位置的位移相同从该时刻起E质点回到平衡位置的最短时间为0.05s.F质点回到平衡位置的最短时间为0.15s质点的振幅为A=10cm则下列说法正确的是
按照氢原子的能级图下列说法正确的是
某兴趣小组利用下列仪器进行气体的制取实验请分析回答下列问题 1仪器B的名称是. 2用高锰酸钾制取一瓶较纯净的O2应选用图中的仪器是填字母序号反应的化学方程式为. 3实验室用仪器ABCEF组合还可以制取的另一种气体是检验该气体的化学方程式为.
如图是磁流体发电机的示意图在间距为d的平行金属板AC间存在磁感应强度为B方向垂直纸面向外的匀强磁场两金属板通过导线与滑动变阻器相连变阻器接入电路的电阻为R.等离子体连续以速度v平行于两金属板垂直射入磁场理想电流表A的读数为I发电机内阻为r则
取碳酸钠样品含少量氯化钠杂质加入烧杯中滴加一定质量的稀盐酸至恰好完全反应时得到4.4g二氧化碳气体和100g溶质质量分数为14.1%的氯化钠溶液.请计算 1稀盐酸中溶质的质量. 2原混合物中碳酸钠的质量分数.结果精确到0.1%
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