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函数y=2x-x2的图象大致是（ ）
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高二下学期数学《》真题及答案
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作出下列函数的大致图象1y＝x2－2|x|2y＝3y＝.
若实数abc满足a+b+c=0且a>b>c则一次函数y=2ax－3c的大致图象不经过第_______
正比例函数y=kxk≠0的图象在第二四象限则一次函数y=x+k的图象大致是
已知函数y=2x﹣46分1设点Aa2在这个函数图象上求a的值2画出图象观察图象直接写出当y＞0y=0
已知函数y＝fx的导函数f′x的图象如图所示试画出函数y＝fx的大致图象.
已知函数y＝的图象经过点23下列说法正确的是
y随x的增大而增大
函数的图象只在第一象限
当x<0时，y<0
点(－2，－3)不在此函数的图象上
将二次函数的图象向右平移1个单位再向上平移2个单位后所得图象的函数表达式是y=x2则原二次函数图象的
y=（x﹣1）
2
+2
y=（x+1）
2
+2
y=（x﹣1）
2
﹣2
y=（x+1）
2
﹣2
若实数abc满足a+b+c=0且a>b>c则一次函数y=2ax－3c的大致图象不经过第_______
已知函数fx＝2x－将y＝fx的图象向右平移两个单位得到y＝gx的图象.1求函数y＝gx的解析式2若
已知一次函数y=kx+b的图象经过点-1-5且与正比例函数y=x的图象相交于点2a．求1a的值2kb
函数y=e|lnx|-|x-2|的图象大致是
A
B
C
D
下列判断中唯一正确的是
函数y=ax
2
的图象开口向上,函数y=－ax
2
的图象开口向下
二次函数y=ax
2
,当x<0时,y随x的增大而增大
y=2x
2
与y=-2x
2
图象的顶点、对称轴、开口方向、开口大小完全相同
抛物线y=ax
2
与y= －ax
2
的图象关于x轴对称
已知二次函数y=x2﹣2x﹣8.1求函数图象的顶点坐标对称轴及与坐标轴交点的坐标2并画出函数的大致图
已知A.15和B.m－2是一次函数y＝kx＋b的图象与反比例函数y＝的图象的两个交点.1求m的值和函
函数y＝fx的图象如图所示试画出导函数f′x图象的大致形状.
已知一次函数y=kx+b的图象如图那么正比例函数y=kx和反比例函数y=在同一坐标系中的图象大致是
函数y＝fx的图象与y＝2x的图象关于直线y＝x对称则函数y＝f4x－x2的递增区间是.
已知反比例函数 y = − 2 x . 1画出该函数的大致图象. 2这个函数的大致图象位于哪些
抛物线y=ax2+bx+ca≠0的图象大致如图所示下列说法①2a+b=0;②当-1≤x≤3时y
已知正比例函数y=kxk≠0的函数值y随x的增大而减小则函数y=kx-k的图象大致是
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OurMuseumsGalleriesandZoo 19world﹣classmuseumsgalleriesandazoo TheSmithsonianofferselevenmuseumsandgalleriesontheNationalMallandsixothermuseumsandtheNationalZoointhegreaterNationalCapitalArea.InNewYorkCityweinviteyoutotourtwomuseumsinhistoricsettings. NotnearaSmithsonianmuseum?Lookforexhibitionsandmuseumsinyourcommunity.Herewehavelistedsomeplacestovisit Tips&Guidelines StopatanySmithsonianmuseuminformationdeskwherefriendlyandknowledgeablestaffandvolunteerscanassistyouinplanningyourvisit. ServiceanimalsarewelcomeatthemuseumsandtheNationalZoo.Petsarenotpermitted. Lunchesshouldbeproperlyclosedorstoredinlockersduringyourvisit. 1TheSmithsonianoffersalltheseEXCEPT. A.galleries B.concerts C.museums D.zoos 2Ifyouareinterestedinanimalsyoucan. A.goto1661PennsylvaniaAvenueNWWashingtonDC B.goto8thandFStreetsNWWashingtonDC C.visitthemuseum11a.m.onChristmas D.visitthezooatweekendsonJune25 3Toarrangeyourvisitbetteryoucan. A.havelunchduringyourvisit B.takeyourpetsalongwithyou C.askthestaffandvolunteersforhelp D.fillinanapplicationformbeforeyourvisit
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ItwasMother'sDaybuttheyoungmotherwasalittleunhappybecauseshewas800milesawayfromherparents.Inthemorningshephonedhermother1wishherahappyMother'sDayandhermothertoldheraboutthebeautifullilacs丁香inthegarden.2latethatdaywhenshetoldherhusbandaboutthelilacshesaidIknowwherewecanfindallthatyouwant.Getthechildrenandcomeon.Sotheywent3drivedownthecountryroads. Thereonasmallhilltheysawalotof4beautypurplelilacs.Theyoungwomanranquicklytoenjoytheflowers.Carefullyshepickedafewhereandafewthere.Ontheirwayhometherewasasmile5herface.ziliaoqun700292070 Whentheywerepassinganursinghome养老院theyoungwomansaw6oldgrannysittinginachair.Shehadnochildrenwithher.They7stopthecarandtheyoungwomanwalkedtotheoldwomanputtheflowersinher8handandsmiledather.Theoldgrannythankedheragainandagain.Shesmiledhappilytoo. Whentheyoungmothercamebacktohercarherchildrenaskedher9isthatoldgranny?Whydidyougiveourflowerstoher? Idon'tknowher10theymothersaid.Butit'sMother'sDayandshehasnochildren.IhaveallofyouandIstillhavemymother.Justthinkhowmuchthoseflowersmeanttoher.
已知函数fx＝sinxcosx+cos2x． 1求y＝fx的最小正周期并求其单调递减区间 2△ABC的内角ABC所对的边分别为abc若fA＝且A为钝角a＝2求△ABC面积的最大值．
在数列{an}中a1＝2an+1＝an+n+1则a5＝．
AphotographthatonehastakenofoneselftypicallywithasmartphoneorwebcamanduploadedtoasocialmediawebsiteisthedefinitionofselfieintheOxfordEnglishDictionary.Infactitwasn'teveninthedictionaryuntilAugustoflastyear.Itearneditsplacetherebecausepeoplearenowsoobsessedwith对……痴迷selfies﹣wetakethemwhenwetryonanewhatplaywithourpetsorwhenwemeetafriendwhomwehaven'tseeninawhile. Butisthereanyscientificexplanationforthisobsession?WellyoushouldprobablyaskJamesKilneraneuroscientist神经系统科学家atUniversityCollegeLondon. Throughourlifetimewebecomeexpertsatrecognizingandinterpretingotherpeople'sfacesandfacialexpressions.IncontrastaccordingtoKilnerwehaveaverypoorunderstandingofourownfacessincewehavelittleexperienceoflookingatthem﹣wejustfeelthemmostofthetime. ThishasbeenprovedinpreviousstudiesaccordingtotheBB24C. Kilnerfoundthatmostpeoplechosethemoreattractivepicture.Thissuggeststhatwetendtothinkofourselvesasbetter﹣lookingthanweactuallyare.TofurthertesthowweactuallyperceiveourownfacesKilnercarriedoutanotherstudy.Heshowedpeopledifferentversionsoftheirownportrait﹣theoriginalonethathadbeeneditedtolooklessattractiveandonethatwasmademoreattractive﹣andaskedthemtopicktheversionwhichtheythoughtlookedmostlikethem.Theychosethemoreattractiveversion. Butwhatdoesitsayaboutsettles?Wellisn'tthatobvious?Selfiesgiveusthepowertocreateaphotograph﹣bytakingitfromvariousangleswithdifferentposesusingfilters滤色镜andsoon﹣thatbettermatchesourexpectationswithouractualfaces. Yousuddenlyhavecontrolinawaythatyoudon'thaveinnon﹣virtual非虚拟的interactionsKilnertoldtheCanada﹣basedCTVNews.Selfiesallowyoutokeeptakingpicturesuntilyoumanagetotakeoneyou'rehappywithheexplained. 1Whatisthepassagemainlyabout? A.Thedefinitionandfunoftakingselfies. B.Theexplanationofwhypeoplelovetakingselfies. C.Howtakingselfiesinfluencespeople'sdailylives. D.Howtointerpretpeople'sfacialexpressionsintheirselfies. 2TheunderlinedwordperceiveinParagraph5canbereplacedby. A.interpret B.beautify C.choose D.destroy 3AccordingtoKilnerpeopleliketakingselfiesprobablybecausetheythink. A.itisagoodchancetolearnmoreabouttheiractualfaces B.itisawaytorespondtoothers'facialexpressionscorrectly C.itenablesthemtointeractwiththeirfriendsinsocialmedia D.itallowsthemtosatisfytheirexpectationswiththeirappearances
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TheSurprisinglyEasyTrickThatCanHelpYouUseYourPhoneaLittleBitLess ThefirstthingIdointhemorningsislookatmyphone.That'smainlybecausemyphoneismyalarmclockbutoncemyeyesareopenandthatscreenislitupinmyhandsit'sanawfullyshorttriptocheckingemailsandperusingheadlines.1Myemailsthatearlyinthemorningaremainlyjunkandtheheadlineswon'tchangemuchbeforeI'vebrushedmyteethandpouredacupofcoffeeright? MywifesaysI'maddictedtomyphone.2I'mnotterriblyactiveonsocialmediabutIdoenjoymesomeidlescrollingenjoyplayingthemobilephone.Andwowdothesetechcompaniesknowhowtokeepthosethumbsconstantlyswipingup. 3WhileIthinkwe'reprettygoodaboutlimitingherscreentimeitwouldseemthattechnologyhashaditshooksinmefromthestart.SoIdecidedtotrylooseningmyphone'sgrasponmyattentionbyswitchingthescreentoblackandwhite. Changingthedisplaytoblackandwhiteisveryeasy.InyouriPhone'ssettingschooseGeneralthenAccessibility.NextchooseDisplayAccommodationsthenColorFilters.Tapthetoggleonandalistoffiltersappears.4 ButnoonewantstogothroughallthiseverytimetheywanttoturncolorbackontocheckoutanInstagramstory.Clearlyyoudon'talwayswantyourscreentobeblackandwhite.Afteralltherewillunavoidablybephotostoviewandvideostoshare.5IntheAccessibilitymenutapAccessibilityShortcutandchooseColorFilters.Nowpressingthehomebuttonthreetimeswillswitchyourdisplaytocolorandthenbackwithanotherthree. A.There'snoreasonformetobedoingthis. B.We'vegotathree﹣year﹣oldchild. C.ChooseGrayscaleandyou'reallset. D.Itcanhelpyouuseyourphonealittlebitless E.IdisagreebutIcandefinitelystandtospendlesstimelookingatit. F.Herecomesasurprisinglyeasytrick. G.Thatiswhatmakessettingashortcutnecessary.
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Ifyouaskmostpeoplewhatwatertasteslikethey'llprobablytellyouthatwaterhasnotasteandtheymaygiveyouafunnylook.Butifyouwereafruitflyaskinganotherfruitflythatquestionmighthaveadifferentanswer. Toafruitflywaterhasataste.Scientistswanttoknowhowthefruitflyknowswaterbecausethisinformationmayhelpinlearninghowotheranimalsmanagetousewaterintherightway.Waterisveryimportanttolifebuttoomuchortoolittlecanbedeadlytoalivingcreature.Sobyunderstandinghowthefruitflytasteswaterresearchersmaylearnmoreaboutotherlivingthings. AccordingtothenewstudyaproteincalledPPK28makesitpossibleforaflytotastewater.Proteinsbuildcellsandtissuesfightdiseaseandcarrymessagesbetweencells.It'snotsurprisingthataproteinisresponsibleforthefruitfly'sabilitytotastewater. ThePPK28proteinispartofalargerfamilyofsimilarproteins.Oneoftheserelatedproteinsisusedbymammalsincludinghumanstotastesalt.Scientistshavenotfoundaproteinthatenableshumanstotastewater.IntheexperimentCameronandhisteamcomparednormalfruitflieswithfruitflieswhosetastecellshadhadbeendisabled.ThefruitfliesweregivenaspecialchemicalthatwouldglowwhentheflyusedthePPK28protein.Thenthescientistsledthefliestowater.WhenthenormalfliestastedthewaterthePPK28proteinlitup﹣showingthatitwasinuse.Thefruitflyinparticularissointerestingthatsomescientistsarehardatworkcreatingacompletemapofthefruitflybrain.Thismapwillshowallofafly'sneuronsandhelpscientistsunderstandhowtheneuronsworktogether. 1Howdomostpeoplefeelwhenaskedthetasteofwater? A.Disappointed B.Frightened. C.Amused D.Disgusted. 2Whydoscientistswanttounderstandhowthefruitflyknowswater? A.Todecreasethenumberofthefruitfly. B.Toknowmoreaboutothercreatures. C.Tomanagetousewatercorrectly. D.Todescribethetasteofwater. 3WhatdoweknowaboutthePPk28protein? A.Itcanmakehumanstastesalt. B.Itenablesthefruitflytotastewater. C.Thefruitflycan'tlivewithoutit. D.Thefruitflyusesittoavoidillnesses. 4Whatwillthescientistscontinuetoworkat? A.MakingthePPk28protein. B.Tellingmoreinformationaboutcells. C.Creatingmapsofhumanbrains. D.Studyingthefruitfly'sneuronsystems.
假设你是红星中学高三学生李华请根据以下四幅图的先后顺序写一篇英文周记记录上周你和同学参与国家博物馆庆祝改革开放四十周年大型展览Celebrating40thAnniversaryofReformandOpening﹣up志愿者活动的全过程. 注意词数不少于60提示词国家博物馆theNationalMuseumofChina
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有一款手机每部购买费用是5000元每年网络费和电话费共需1000元每部手机第一年不需锥修第二年推修费用为100元以后每一年的维修费用均比上一年增加100元．设该款手机每部使用x年共需维修费用fx元总费用gx元总费用一购买费用+网络费和电话费十维修费用 1求函数fxgx的表达式 2这款手机每部使用多少年时它的年平均费用最少
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It'sasadandfamiliarvoicethatweoftenhearinbigcitiesCanyousparesomechange? Usuallywhenfacedwiththatparticular1IhavefeelingsofguiltifIpassby2givingacoinortwo. Ihadthatfeeling3inVenicewhileonatourofItaly'sfamoussitesin2006.Ihadtakenrefugefromthe4inaquietcafé.Outsidetherewasanoldwomankneelingonthehardancientpavingstones5. Steady6oftouristswerewalkingpasther.Ayoungbackpackerstoodawayfromthecrowd7drinkinginthescenerybutInoticedtheyoungtravelerwasalso8theoldwoman. Atouristgroupwalkedalongthestreet9thewomanandwalkedon.10groupoftouristsarrivedandwalkedpasttheoldlady.Thebackpackerwatched11everybodyelsewentontheirwayfocusedonthe12aroundthem.ThenIwaspreparingtoleavewhenIcaughtsightofthebackpackersteppingforwardand13somemoneyinthewoman'scup.Hedidthissomewhat14justbeforethearrivalofanothertouristgroup.AsI15theleaderofthegroupstoppedandputsomemoneyinthecup.Havingbeenshownthewayothertouristsfollowedsuitand16somemorecoinstothecup. Hisworkdonetheyoungmanwalkedovertotheoldbeggar﹣womanpattedherontheshoulderandsaidIhopethat17alittle. Idon'tknowifthewomanunderstoodhisEnglishor18whathadjusthappenedbutIdid. Iplacedsomemoneyinthewoman'scupandcontinuedmytravels19afterwitnessingsuchan20actofkindness. 1A.sound B.question C.excuse D.command 2A.beyond B.after C.without D.before 3A.manytimes B.sometimes C.onlyonce D.onceagain 4A.crowds B.families C.streets D.signs 5A.singing B.crying C.begging D.trembling 6A.streams B.packs C.masses D.groups 7A.simply B.seemingly C.similarly D.specially 8A.showing B.following C.checking D.observing 9A.glancedat B.laughedat C.rushedat D.staredat 10A.One B.More C.Another D.Other 11A.if B.since C.because D.as 12A.stones B.sights C.signs D.tourists 13A.lending B.borrowing C.placing D.taking 14A.accidentally B.successfully C.deliberately D.cheerfully 15A.watched B.shown C.understood D.walked 16A.changed B.charged C.found D.added 17A.measures B.helps C.explains D.matters 18A.recognized B.caught C.realized D.figured 19A.pleasant B.annoyed C.disappointed D.delighted 20A.beautiful B.admirable C.pure D.accurate
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BothEnglishandFrenchareolanguagesinCanada.
Tobehalotofpeopleattachgreatimportancetobecomingrichandfamous.
Althoughitisoftencalledthekoalabearthislovelyanimalisnotactuallyabearatall.Itisamarsupial有袋目哺乳动物andlikekangaroosafemalekoalacarriesherbabyinherpouch育儿袋foraboutsixmonths. KoalasliveinfourstatesonlyineasternAustraliawheretheeucalyptustrees桉树theylovearemostplentiful.Infacttheyrarelyleavethesetreestheirsharpclawseasilykeepingthemhighupintheair. Duringthedaytheysleepforupto18hours.Whennotasleeptheyfeedoneucalyptusleavesespeciallyatnight.Koalasdonotdrinkmuchwaterandtheygetmostoftheirwaterfromtheseleaves.Eachanimaleatsalargeamountforitssize﹣abouttwoandahalfpoundsofleavesadayevenstoringsnacksofleavesinpouches. Thekoalabearswerewidelyhuntedduringthe1920sand1930sandtheirpopulationsdecreasedsuddenly.Helpedbyreintroductiontheyhavereappearedovermuchoftheirformerrangebuttheirpopulationsaresmaller.Koalasneedalotofspace﹣aboutahundredtreesperanimal﹣whichisapressingproblemasAustralia'swoodlandscontinuetogetsmallerbecausethetreestheyliveonarebeingcutdowntomakefarms.Alsoforestfirescausedbyheatwavesaredestroyingtheforeststhekoalaslivein. Ithasbeenestimated估算thatthereareonly100000koalasleftinthewildwiththelowestestimatesbeingnomorethan43000.ThekoalacanonlyeateucalyptusleavesandlivesnowhereelseexceptAustraliasoinordertosurvivehumaneffectonitslimitedenvironmentmustbecontrolledorthisattractivecreaturefacescertainextinction. 1Whyarekoalasindangerofdyingoutaccordingtothetext? A.Manyofthemdiedintheforestfire. B.Theycan'tbeusedtotheglobalwarming. C.Theirlivingenvironmentisgraduallybeingworsened. D.Farmersareburningtheeucalyptustreesthatkoalasliveon. 2Whathappenedduringthe1920sand1930s? A.Koalasfacedgreatdanger. B.Koalagotwellprotected. C.Koalas'populationfellslowly. D.Koalahadenoughspacetolivein. 3Whatwilltheauthormostprobablytalkaboutnext? A.Howtoincreasekoalas'population. B.Howtomakethebestofthelimitedenvironment. C.Howtohelpkoalasgetusedtothenewlivingenvironment. D.Howtoreducehumaneffectonkoalas'livingenvironment.
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