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已知:y+2与3x成正比例,且当x=1时,y的值为4.(1)求y与x之间的函数关系式;(2)若点(m-1,a)、点(m+2,b)(m为常数)是该函数图象上的两点,试比较a、b的大小,并说明理由.
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已知:y=y1+y2y1与x成正比例y2与x2成正比例当x=1时y=6当x=3时y=8求y关于x的解
已知y﹣3与x成正比例且x=2时y=7则y与x的函数关系式为
y=2x+3
y=2x﹣3
y﹣3=2x+3
y=3x﹣3
y与x-1成正比例且x=2时y=4则y=2时x的值是
4
7/3
3/2
6/5
已知y与x成正比例且当x=1时y=2那么当x=-1时y=_______.
已知y+2与x﹣1成正比例且x=3时y=4.1求y与x之间的函数关系式2当y=1时求x的值.
已知y+3与x+2成正比例且当x=3时y=7.1写出y与x之间的函数关系式2当x=﹣1时求y的值.
已知y+3与x+2成正比例且当x=3时y=7.1写出y与x之间的函数关系式2当x=-1时求y的值3当
已知y=y1+y2其中y1与x成正比例y2与x-2成反比例.当x=1时y=-1x=3时y=51求y与
已知y+2与3x成正比例当x=1时y的值为4.1求y与x之间的函数关系式2若点-1a2b是该函数图象
已知y与x成正比例且当x=1时y=2那么当x=3时y=_______
已知函数y=y1-y2y1与x成反比例y2与x-2成正比例且当x=1时y=-1当x=3时y=5.①求
已知y-3与x+5成正比例且当x=2时y=17.求1y与x的函数关系2当x=5时y的值.
已知函数y=y1-y2y1与x成反比例y2与x-2成正比例且当x=1时y=-1当x=3时y=5.求当
已知y=y1+y2y1与x成正比例y2与x+2成反比例且当x=﹣1时y=3当x=3时y=7.求x=﹣
已知y与x成正比例且当x=1时y=2那么当x=3时y=.
已知y=y1+y2y1与x成正比例y2与x-1成正比例且x=3时y=4x=1时y=2求y与x之间的
已知y1与x成正比例y2与x+2成正比例且y=y1+y2当x=2时y=4;当x=-1时y=7求y与x
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已知y与z成正比例z与x成反比例.当x=﹣4时z=3y=﹣4.求1y关于x的函数解析式2当z=﹣1时
已知y+2与3x成正比例且当x=1时y的值为4.1求y与x之间的函数关系式2若点m−1a点m+2bm
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ThesedaysyoungpeopleinsomeEnglish﹣speakingcountriesarespeakingastrangelanguageespeciallywhencommunicatingonsocialmedia. LookatthesewordschosenbyTheWashingtonPostDavidBowiedyingistotestradgeandWhenCookiehuggedJamalitmademetotesemosh.OrthissentenceBAEletmeknowifyoustayintonight.Whatonearthdotheymean?Welltotesisashortformoftotally.Similarlytradgemeanstragicandemoshmeansemotional.Itseemsthatformillennials千禧一代typinginthisformisnotonlytime﹣savingbutfashionable. Asyoucanseemanymillennialslangsalsonamedase﹣slangsareformedbyso﹣calledtotesing﹣thesystematicabbreviation缩写ofwords.ThetrendmighthavestartedwithtotallybecomingtotesbutitnowhasspreadtomanyotherEnglishwords. Theoriginsofothermillennialslangsaremorecomplexthantotesing.BaeforexamplehasbeenwidelyusedbyAfrican﹣Americansforyears.Itcanbeanexpressionofclosenesswithone'sromanticpartnerorlikesweetheartforsomeonewithoutromanticconnection.AfterpopsingerPharrellusedthewordinhisworkbaebecamemainstream. SomepeoplemightthinkmillennialslangslowerthevalueoftheEnglishlanguagebutMelbourneUniversitylinguistRoseyBillingtondoesn'tagree.Shesayswhenpeopleareabletousealanguageinacreativewaytheyshowthattheyknowthelanguageruleswellenoughtousewordsdifferently.TwootherlinguistsLaurenSpradlinandTaylorJonessharethesameview.Thetwoanalyzedhundredsofexamplesoftotes﹣speakanddiscoveredtotesinghascomplexroots. Itisn'tsimplyanadultversionofbabytalknoracleverwaytominimizeyourwordcount.Ratheritisahighlyorganizedsystemthatreliesonaspeaker'smasteryofEnglishpronunciation.ItisaboutsoundsfollowssoundsystemofEnglishandhasstrictrules. 1.Whydoyoungpeoplelikeusinge﹣slangs? A.Becausetheyaretime﹣consuming. B.Becausetheyarecomplex. C.Becausetheyareinfashion. D.Becausetheyareinorder. 2.What'stheauthor'spurposeofmentioningBaeinParagraph4? A.Tosupportthattotesingisnobabytalk. B.Toexplainthecomplexoriginsofmillennialslangs. C.Toinformpeoplehowitbecamemainstream. D.Toanalyzetheusageofmillennialslangs. 3.WhichstatementmayRoseyBillingtonagreewith? A.Totes﹣speakrequiresagoodcommandofEnglish. B.MillennialslangslowerthevalueofEnglish. C.It'ssimplyacleverwaytoreducethewordcount. D.Totesingisalooselyorganizedsystem. 4.What'sthebesttitleofthepassage? A.EnglishHasGreatlyChanged B.LinguistsDisapproveofTotesing C.MillennialSlangsTaketheLead D.E﹣slangsCatchonAmongYouth
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某中学将100名高二文科生分成水平相同的甲乙两个“平行班”每班50人.陈老师采用AB两种不同的教学方式分别在甲乙两个班进行教改实验.为了了解教学效果期末考试后陈老师对甲乙两个班级的学生成绩进行统计分析画出频率分布直方图如图.记成绩不低于90分者为“成绩优秀”. Ⅰ根据频率分布直方图填写下面2×2列联表 Ⅱ判断能否在犯错误的概率不超过0.05的前提下认为“成绩优秀”与教学方式有关 附.
Itwasmanyyearsago.Iwasayoungdadsittingonthecouchreadingafairytaletomylittlegirl.ShesatnexttomewithherheadonmyarmasI1thetale.WhenitcametotheendI2withthosefamouswordsAndtheylivedhappilyever3.AsIlookedovertoherwithherwavybrownhairandbiginnocenteyesIcouldseethe4onherfaceandIneverwantedittoend.Itdawned渐渐明白onmethenthatthe5ofthebookwaswhatIwantedforher.Iwantedhertolivehappilyeverafter. Stilldeepinmy6Iknewthatthiscouldn'talwaysbeso.Iknewthattherewouldbe7whenherheartwasbroken.Iknewtherewouldbetimeswhenshecriedingrief悲痛andIcouldn't8her.Iknewtherewouldbetimeswhen9shefeltwasfearsadnesssorrowanddespair.AsItouchedherhairandsmiledatherIhopedthatthosetimeswouldbe10andthatshewouldhave11inherlifemoreoftenthannot.Livinghappilyeverafterthoughseemedoutofthe12. It13mealotofyearstorealizethatitis14tolivehappilyeverafter.Youjusthavetodoitonedayatatime.15youseeisn'tsomerewardthatyougetattheendofyourjourney.Happinessisn'tsomethingdependingonwhatlife16you.Happinessis17youcreateinyourlifechoicebychoiceanddaybyday. Thetruthishappiness18whenyoulove.LoveisagiftfromGod.Itislovethat19brokenhearts.Itislovethat20pain.Itislovethatgivesusjoy.Choosetolivehappilyeverafteronedayatatime. 1.A.wrote B.told C.said D.heard 2.A.finished B.spoke C.cried D.started 3.A.then B.after C.before D.now 4.A.tears B.sadness C.smile D.sorrow 5.A.design B.ending C.name D.goal 6.A.heart B.book C.eyes D.story 7.A.years B.days C.moments D.times 8.A.join B.concern C.leave D.comfort 9.A.it B.which C.all D.that 10.A.extreme B.brief C.regular D.active 11.A.problem B.joy C.trouble D.difficulty 12.A.life B.door C.question D.mind 13.A.made B.kept C.took D.asked 14.A.necessary B.different C.important D.possible 15.A.Happiness B.Health C.Wealth D.Love 16.A.charges B.faces C.points D.hands 17.A.nothing B.something C.anything D.everything 18.A.comes B.flies C.moves D.runs 19.A.fills B.causes C.fixes D.fights 20.A.removes B.determines C.admits D.contains
设abc都为正数那么用反证法证明三个数abc至少有一个不小于2时正确的反设是这三个数
IhavereceivedmanyChristmasgiftsovertheyears.ThebestgiftIeverreceivedwaspresentedtomebyastranger.IneverevenknewhisnameandIonlyhadcontactwithhimforlessthan60seconds.HisChristmaspresenttomechangedthewayIthinkaboutpeopleandaboutChristmas. IhateBlackFridaysales.It'softenagatheringofpeoplewhoarethereformanydifferentreasons.Somearelookingforadealonthatoneitemfortheirlovedoneorperhapsthemselves.TheirpurposescompletelyhavenothingtodowiththefestivetimeofyearandcanjustbesummedupwithonewordCheap! ItwasseveralyearsagowhenmywifeaskedmetomeetheratthelocaldepartmentstoreonBlackFridaymorning.Theyhadadvertisedachild'sbikethatshewantedtopurchaseforourson.Westoodwithaverylargecrowdwaitingforthemanagertoblowthewhistle口哨.ItoldmywifethatifwegotabikefinebutifwedidnotIwasOKwiththattoo. AsthenumberofbikesbegantograduallydecreaseIsawmypoliteopportunitytoreachmyhandsaroundthecornerofoneoftheboxes.Ilifteditandsuddenlyfeltsomemildresistance阻力.IlookeduptoseeoneofthelargestgentlemenIhadeverseeninmylife.Frighteningwasnotthewordtodescribehisappearance.Hewaswearinglotsofstrapsofmetalspikedleather带有柳钉的皮带aroundbotharmsandevenhisneck.Stilltattoos纹身wereanobviousloveofhis. Istartedtoreturntheboxbuthegentlypusheditbackinmydirectionandbackintomyhands.Hethendirecteditintomyshoppingcart.HelookedatmesmiledandsaidMerryChristmas.AllthewayhomeIwasthinkingthatthismomentwasbyfarthebestChristmasgiftIhadeverreceived.Thekindnessofastrangerthatbrokeallprejudice偏见Imayhavehadofcertaintypesofpeople.Thesoftnessofahumanheartcanbeseeninasimpleact.Iwillneverforgetit. 1.Whatmaybethebesttitleofthepassage? A.TheBestChristmasGift. B.AChild'sBike. C.BlackFridaySales. D.AHandsomeStranger. 2.WhydomanypeoplegotoBlackFridaysales? A.Becausetheycanmakemoney. B.Becausetheyhopetofindabargain. C.Becauseit'sawaytocelebrateChristmas. D.Becauseit'saplacetogetthingsfreeofcharge. 3.WhatdoestheunderlinedwordpurchasemeaninParagraph3? A.devote B.solve C.buy D.save 4.Whatcanwelearnfromthepassage? A.AllroadsleadtoRome. B.It'snevertoooldtostudy. C.Youcannotclapwithonehand. D.Mencannotbejudgedbytheirappearances.
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如图所示在竖直面内A点固定有一带电的小球可视为点电荷.在带电小球形成的电场中有一带电粒子在水平面内绕O点做匀速圆周运动下列说法正确的是
下列说法正确的是
复数=
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AtlantawasaverybeautifulGreekprincessandcouldrun1fastthananymaninGreece.ButshewasnotallowedtorunandwingloryforherselfintheOlympicGames.Shewassoangrythatshesaidtoherfatherthatshewouldnotmarryanyone2couldnotrunasfastasher.HerfathersaidthatshemustmarrysoAtlantamade3bargainwithhim.Shesaidtohim.Thesearemyrules.WhenamansayshewantstomarrymeIwillrunagainsthim.Ifhecannotrunasfastasmehewillbekilled.Noonewillbepardoned. ManykingsandprinceswantedtomarryAtlantabutwhentheyheardofherrulestheyknewitwas4hope.Sosomeofthem5sadwenthomebutothersstayedtoruntherace.Therewasaman6callHippomeneswhowasamazed7Atlanta'srulesWhyarethesemensofoolish?hethought.Whywilltheyletthemselves8killbecausetheycannotrunasfastasthisprincess?9whenhesawAtlantacomeoutofherhousetorunHippomenes10changehismind.IwillmarryAtlanta﹣ordie!hesaid. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
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Somestudentspreferapart﹣timejobafterclasstoearnsomemoneyandimprovethemselves.Herearesomegoodcompanies IN﹣N﹣OutBurger ItisthebesthamburgershopinthewestofAmerica.Regardedasoneofthebestemployersitoffersflexiblehoursandthehighestpart﹣timesalaries薪水.Aboveallthecompanytreatsitsemployeesthewaytheywouldliketobetreatedlikefamily.Howeverthereisnodiscountofferedtoitsemployees. Positionsellingassistantexperiencerequired Websitewww.in﹣n﹣out.cm StarbucksCoffee Starbuckshasbeenattheforefront前沿oftheUnitedStates'coffeerevolution.Workinghoursareflexible.Fittwentyhoursofworkintoyourweek.Thereisalsoa30%discountandafreepoundofcoffeeorboxofteaeveryweek. Positionassistantcoffeetasterexperiencerequired Websitewww.Starbucks.Com WholeFoodsMarket WholeFoodsMarketistheworld'slargestnaturalandorganicfoodsellingcompany.WithitsfocusonorganicingredientsWholeFoodsMarketisallabouthealth.Workinghoursareflexible.Benefitsincludepaid﹣timeoffanda20%discountsoyoucaneatlikeakingoratleastlikeatopchefintraining.Therearealsotrainingcoursesonhealthandfoodeveryweek. Positionsecretary Websitewwww.wholefoodsmarket.com. Lands'End Lands'EndisaWisconsin﹣basedclothesstorethatfocusesoncasualcomfortandwarmthforthegreatoutdoors.Employeesevenpart﹣timeemployeeshavethechancetogotoacompany﹣ownedentertainmentcentreandgeta25%discountonthemeparksandmoviesandaninvitationtotheyearlycompanypicnic.Besidesforpart﹣timeemployeesworkinghoursareflexibleandtheycancometoworkanytimetheylikeaslongastheyworkfor4hoursaday. Positionsalesperson Websitewww.landsend.com 1.Whichcompanyoffersitsemployeesthebestdiscount? A.In﹣N﹣OutBurger. B.WholeFoodsMarket. C.StarbucksCoffee. D.Lands'End. 2.Whichwebsiteshouldyouvisitifyouareinterestedinsellingclothes? A.www.in﹣n﹣out.com B.www.landsend.com C.www.wholefoodsmarket.com D.www.starbucks.com 3.Whatdothefourcompanieshaveincommon? A.Trainingcoursesareoffered. B.Workinghoursareflexible. C.Relatedexperienceisrequired. D.Employeescangethighsalaries.
甲乙两人做定点投篮游戏已知甲每次投篮命中率均为p乙每次投篮命中的概率均为甲投篮3次均未命中的概率为甲乙每次投篮是否命中相互之间没有影响. 1若甲投篮3次求至少命中2次的概率 2若甲乙各投篮2次设两人命中的总次数为X求X的分布列和数学期望.
在产品质量检验时常从产品中抽出一部分进行检查.现从98件正品和2件次品共100件产品中任选3件检查恰有一件次品的抽法有种.
下列说法正确的是
一长木板置于粗糙水平地面上木板右端放置一小物块如图所示.木板与地面间的动摩擦因数μ1=0.1物块与木板间的动摩擦因数μ2=0.4t=0时刻开始小物块与木板一起以共同速度向墙壁运动当t=1s时木板以速度v1=4m/s与墙壁碰撞碰撞时间极短.碰撞前后木板速度大小不变方向相反.运动过程中小物块第一次减速为零时恰好从木板上掉下.已知木板的质量是小物块质量的15倍重力加速度大小g取10m/s2.求 1t=0时刻木板的速度 2木板的长度.
求证.
某同学组装完成的简易多用电表的电路图如图甲所示.该多用电表有个电阳档红表笔接选填A或B该同学选择多用电表的×1Ω挡测量一电阻R2的阻值正确操作后得到如图乙所示的指针情况则电阻Rx的阻值约为Ω.
Chinesenetizensareknownforcomingupwithstrangeandcreativeterms术语forpeopleandthingsmakingthenewsandtheyspreadlikewildfire. Fromskinnybluemushroomstomelon﹣eatingmassestheBBCtakesalookatwhathascaughttheirimaginationsthisyear. SichuanTrump USPresident﹣electDonaldTrumpisknownaschuanpubymainstreammediaoutlets. Buttheconspiracytheory阴谋论spreadonsocialnetworksWeiboandWeChatisthatTrumpwasbornin1946inSichuanwhenhisfathersetupabusinessinChina. It'snonsenseofcoursebutthathasn'tstoppedsomelocalsfromviewinghimastheprideofSichuan﹣thoughhisrecentspeechattacksagainstChina. Prehistoricpowers NationalswimmerFuYuanhuinotonlywonabronzemedalattheRioOlympicGamesbutalsoscoredawinwithviewersinChinainaTVinterview. WhentoldshecouldfightforthefinalFupulledafunnyfaceandsaidIhaveusedallmyprehistoricpowerstoswim! ‘Prehistoricpowers'orhonghuangzhiliwassoonusedasatermforanunstoppableforcewhileFubecameaninternetdarling. Skinnybluemushroom Oneman'smisfortuneinloveturnedouttobeagoldminefornetizenswhenamanfromGuangxiprovinceuploadedavideoofhimselftalkingabouthislonelinesswhilehisgirlfriendwasaway. UnbearableIwanttocryhemoaned﹣butthankstohisheavyaccentitendedupsoundingmorelikeskinnybluemushroom. LanshouxiangguwasthensharedmorewidelyandtookoffasamememostlyasawaytomakefunofthesouthernGuangxiaccent. Melon﹣eatingmasses Thefullestexpressionofthistermisthemelon﹣eatingmasseswhodon'tknowwhat'sreallygoingon. Itsoriginisunclearbutnetizensoftenusethis﹣sometimesderogatorily带贬义地﹣todescribeapassivegroupofbystandersatamajorincidentorevent. 1.Thepassageismainlytalkingabout. A.Chinesenetizens'life B.theimaginationsofBBC'snews C.BBC'snewtermsinitsvocabulary D.strangewordscreatedbyChinesenetizens 2.Whatcanbeusedtoreplacetheunderlinedwordnonsense? A.unreal B.certain C.logical D.universal 3.canbeusedtodescribesomeonewhohasnoideawhat'sgoingon. A.SichuanTrump B.Prehistoricpowers C.Skinnybluemushroom D.Melon﹣eatingmasses
Successinhighschoolisoftenasteppingstonetoabiggersuccessinlife.1However inadditiontohardworkthereareanumberoftime﹣testedwaysyoucanemploytodobetterinhighschool. Findsuccessfulfriends.Studentswhomakefriendswiththosewhodowellinschoolwillimprovetheirgradestoo.2Inadditionsuchstudentscanalsocooperatebysharingnotesandhelpingeachotherunderstandstudymaterial. 3Evenifyouknowthematerialitisalwaysbettertotakenotesjustincaseyoumayforgetsomething.Inadditiontakingnotesmakesyourattentionfocusedduringclasstime.Alsorewriteandorganizeyournotesthesamedaytohelpyourememberthematerial. Reducestress.Stresscausesyoutobecometired.Furthermorestresscanalsoaffectyouroverallhealth.Bylearningtodealwithstressinhighschoolyouwillacquirealife﹣longhabitofkeepingyourstresslevellow.Stressreductionactivitiesmayincludedanceswalkingandrelaxation.4 Manageyourtime.5Makesureyouuseitwell.Focusonwhat'sreallyimportant﹣yourstudyandsomeexerciseforyourbody.Havingahobbyisfineaslongasitdoesn'ttakeuptoomuchofyourtime.Agoodtooltousetomanageyourtimebetterisaschedule.Trytoplanyourdayinadvanceandsticktothisplan. A.Sportsmusicandperformingartsalsoworkformanypeople. B.Thiswillhappenasaresultofgreatercompetitionbetweenthem. C.Besidestrytomakefulluseofyoursparetimetoreachyourgoal. D.Forminggoodhabitsisveryimportantforeachhighschoolstudent. E.Takingnotesisanotherwaythatcanhelpyousucceedinhighschool. F.Timeisthemostimportantresourcepeoplehave. G.Ifyouwanttoentercollegeoruniversityitisnecessarythatyoustudyhard. 1. 2. 3. 4. 5.
若3x﹣n展开式中各项系数之和为32则该展开式中含x3的项的系数为
如图甲所示两个弹性球A和B放在光滑的水平面上处于静止状态质量分别为m1和m2其中m1=1kg.现给A球一个水平向右的瞬时冲量使AB球发生弹性碰撞以此时刻为计时起点两球的速度随时间变化的规律如图乙所示从图示信息可知
HowmanytimesdoyoucheckyourMomentsorFacebookpageinadaytoseewhetheryourlatestposthasgotanotherlikeorthumbsup? Althoughyoumightbeembarrassedtoadmithowmanytimesyoudothisdon'tworry.Psychologicalfindingshaveshownit'scompletelynormal.Infactthepleasurewederivefromgettingalikeisequaltothatofeatingchocolateorwinningmoneyandwecan'thelpwantingmore. AccordingtothefindingsoftheUCLABrainMappingCenterwhichobserved32teensagedbetween13and18thefeedbackcircuit反馈回路intheteens'brainswereparticularlysensitiveandthesocialandvisualpartsoftheirbrainswereactivewhentheyreceivedlikesonasocialnetwork.Theresearchalsoshowedthatthoughthethumbsupmightcomefromcompletestrangersthegoodtheyderivefromitworkedequally.Howeverdoesitmeanweshouldtryourbesttowinasmanythumbsupaspossible?Notnecessarilysoifweknowthereasonsbehindourdesireforattention.InWhydopeopledesireattentionbyM.FaroukRadwanheexplainedseveralcasesinwhichpeoplenaturallylongedforattention.Radwansaidpeoplewhowereanonlychildusedtobeingthecenterofattentionintheirhousemaytrytoreproducetheseconditions.Feelingoverlookedandunappreciatedmightalsoleadyoutobeeagerforattention.Othertimesthestateofbeingjealousorwantingtocoveryourmistakesmayalsocontributetosuchlongings. Infacttoomuchdesireforattentioncancreateanxietyandinturnruinyourhappinessevenwhenyougetit.Sowhatcanwedoaboutit?Theanswerisquitesimple.Ifpeoplecouldadoptgoalsnotfocusedontheirownself﹣respectbutonsomethinglargerthantheirselfsuchaswhattheycancreateorcontributetootherstheywouldbelesssensitivetosomeofthenegativeeffectsofpursuingself﹣respectwrotepsychologyprofessorJenniferCrockerintheJournalofSocialIssues.Soperhapstheanswertoouraddictiontolikesissimplytofocusonsomethinglargerthanourselves﹣ahardbutaworthyone. 1.WhichofthefollowingcanreplacetheunderlinedwordderiveinParagraph2? A.Deliver. B.Get. C.Drive. D.Prevent. 2.AccordingtopassagewhichofthefollowingstatementsisTRUE? A.Partsofthebrainbecomeclevererwhenreceivinglikes. B.Thosewholacksocialrecognitionmayexpectattention. C.Thumbsupfromstrangerscanhelpyougetmoreattention. D.Beingeagerforattentionshowsthatyouareanonlychild. 3.What'stheauthor'sattitudetowardspeople'saddictiontogettingthumbsup? A.Critical. B.Favorable. C.Unconcerned. D.Supportive. 4.Wecanknowfromthelastparagraphthat. A.focusingonone'sself﹣respectisquitenecessaryandnatural B.pursuingself﹣respectiscompletelyharmfultoone'sgoals C.itishelpfultosetgoalsconcerningmakingcontributions D.checkingyourMomentsorFacebookpageisawasteoftime
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