问题详情：已知函数f(x)＝x2＋2ax＋3，x∈[－4,6]．(1)当a＝－2时，求f(x)的最值；(2)求实数a的取值范围，使y＝f(x)在区间[－4,6]上是单调函数；(3)当a＝1时，求f(|x|)的单调区间．【回答】解:解 (1)当a＝－2时，f(x)＝x2－4x＋3＝(x－2)2－1，由于x∈[－4,6]，∴f(x)在[－4,2]上单调递减，在[2,6]上单调递增，∴f(x)的最小值是f(2)＝－1，又f(－4)...
2020-10-17
问题详情：46.Stand-upisakindofcomedywhoisdoneonastagebyacomedian.47.Peoplearoundtheworldenjoywatchcomedies.48.SangLanhasadaptedhernewlifesuccessfully.49.Laughterisgoodforourhealthy.50.Well,it’stimeforItogo.【回答】46.Stand-upisakindofcomedywhoisdoneon...
2021-04-24
问题详情：当x＝－1时，2ax3－3bx＋8的值为18，则12b－8a＋2的值为（ ）A．40 B．42 C．46 D．56【回答】B 分析：把x＝－1代入2ax3－3bx＋8得2a×（－1）3—36×（－1）＋8＝－2a＋3b＋8．因为此式的值为18，所以－2a＋3b＋8＝18，所以3b－2a＝10，所以12b－8a＝40，所以12b－8a＋2＝40＋2＝42．知识点：整式的加减题型：选择题...
2020-06-30
问题详情：46.Theteachersarestrict________theirpupils.47.Wethink_________necessarytomasteraforeignlanguage.48.Therearetimes__________weneedquietandpeace.49.BeijingwasthefirstcityinChina__________(hold)theOlympicGames.50.Howmuch________(popular)youlookwi...
2021-10-31
问题详情：46.Wecanstarttheworknextweek___________________(如果必要的话).47. _________________________________________________(就我而言),thingsaregoingsmoothly.48. Whenyou___________________________(回忆，回顾)yourownpasttolongago,you are more li...
2019-02-06
问题详情：46.Sheaskedmeto_________(陪伴)hertotheairport.isgenerallyacceptedthatweshouldraiseour________(意识)ofprotectingtheenvironment.r_________(建议)readingthebookbeforeseeingthemovie.49.O_______(忙于)indoinghomework,hehadnotimetoreflectonwhathehadl...
2020-04-06
问题详情：46.IntheUSA,ColumbusDayinmemoryofthe________________(到达)ofChristopherColumbusintheNewWord.47.Themostenergeticandimportantfestivalsaretheonesthat________________(盼望)theendofwinterandtothecomingofspring.48.____________(好奇)droveWangPengins...
2021-02-08
问题详情：46.Post1isaimedatpeoplewhowantto_______. A.maketheirmomshappy B.enjoyeatinghamburgers C.havecheapmealsoutside D.eatchickenseafood47.Theunderlinedword“REWARD”inPost2mostprobablymeans______. A.招聘 ...
2019-06-09
问题详情：It’snormaltowakebrieflyduringthenight. 46 Butifyou’rewakingupduringthenightandhavingtroublefallingbackasleep,thefollowingtipsmayhelp.Stayoutofyourhead.Thekeytogettingbacktosleepiscontinuingtoprepareyourbodyforsleep,soremaininbedinarelaxed...
2021-03-09
问题详情： （46） Youprobablythinkyouwillneverbeatopstudent；Thisisnotnecessarilyso.however,Anyonecanbecomea betterstudent ifheorshewantstoHere'show. PlanyourtimecarefullyWhenplanningyourwork,youshouldmakealistof thingsthatyouhavetodo.Af...
2021-09-24
问题详情：46. Childrenincitiescanreceivehigher___________(educate).47. A___________(smell)gascameoutofthewell.48. ThetrafficruleinEnglandaredifferetfromthoseoftheother_______(Europe)countries.49. Weshouldavoidmakingunfair________________(judge)ofot...
2020-12-06
问题详情：Everycountrysharesthings 46 common:wevaluefamilyandlaughter,cherishfoodandhealth,andcelebratelarge 47 (festival)andtraditions.Yetwithinthesimilarthingsweshare,thereareuniquepartsofeachcountry.OneofcharacteristicsthatarefamousofBri...
2019-08-26
问题详情：Oncetherelivedarichman 46 wantedtodosomethingforthepeopleofhistown. 47 firsthewantedtofindoutwhethertheydeservedhishelp. Inthecentreofthemainroadintothetown,heplaced 48 verylargestone.Thenhe 49 (hi...
2021-03-03
问题详情：youdevelopAIDS,yourchancesof__________(survive)areverysmall.Iwasyoung,Ididn’tknowmuchabouttheharmful_______(affect)ofsmoking.eadvicemighthelpyoutostopand___________(strong)yourdetermination.isthreeyears_______ournewschoolwasbuiltup.paidfamou...
2020-08-05
问题详情：46．Becauseofthecomputer,nowwecan____________（交流）withotherpeopleontheInternet.47．Ourworkmatehasbeenindanger.We’reall___________（关心）abouthishealth.48．ThoughIhaven’tmethimformanyyears,Icould_________（认出）himimmediatelywhenIsawhiminthecrowd.49．Manys...
2021-10-26
Thechylehaddisappeared46dayspostoperatively.Thecorporatetaxratealsofellto34%from46%.Eachcellofourbodiescontains46chromosomes.Bohrat46wasthegrandoldman.Note:foraccessoriesassembling,refertodiagraminpage46.Therewasadouble-pagespreadofadinnerfor46people...
2018-07-18
问题详情：46．Therewassuchalongqueuewaitingfortheticketsande_______________wegaveup．47．Thebadweatherisreportedtohavecontributedtothepassengerplane__________（坠毁）．48．Afterwhatseemedalongtime,theyfinallyarrivedatthed______________．49．Ihavetriedveryhardtofindas___...
2020-12-08
问题详情：46.Itisrequiredthatthefirmr__________(改革)itsunfairsalarystructure.47. Thevicepresidentindicatedthatalla_________forthepostshouldhaveamaster’sdegree.48. Thereisagreatdriveway_________out（标出）fortourists.49. Your__________(分析)ofthe...
2021-06-24
问题详情：46.Suddenlyit_______mehowdifficult_______wasforawomanto______________ herresearchintochimpsintheforest.我突然想起，一个女子继续在森林研究猩猩是多么难。47.JaneGoodallhasbeen____________makingtheworldunderstandandshow___________thelifeofthechimp...
2021-01-21
问题详情： ParisisthecapitalandlargestcityofFrance, 46 (situate)ontheRiverSeine.TheEiffelTower, 47 famoussymbolofParis,isthemostpopularplacefortourists.TheLouvreislocatedinParisaswell.Thecityisalsofamousforitsrestaurants,cafésandt...
2020-06-25
问题详情： Thetruth 46 treesarevitaltoourlifeisnotasecret.Theyprovideuswithfood,woodandmost47 (important),oxygen.Nowthereisonemorethingwecanaddtothislist—blockingoutharmfulbacteriafromwater.111] Thediscovery48 (make)byateamconsisti...
2020-06-24
问题详情：46.ThoughIhavefailedacoupleoftimes,Iwon’tgive______.47.Hardlyhadwesatdowninthetheater______theperformancebegan.48.Lackofmoney,theclubhastoput_______theiractivitytonextmonth.49.Shemeans_______muchtomethatI’dliketotrymybesttogiveallIhavetoher...
2020-03-12
问题详情： 46.Ihavemadealotofgoodfriends Icametothisschool.47.Lindausedtobetooshytospeakin ,butnowsheisoutgoing.Themanasked ,“Couldyoupleasetellmewherethebankis?”49.Ifyouwanttogettherequickly,youshouldavo...
2019-12-26
问题详情：46.LiMingis_______(optimism)abouthisfuture.47._______(exhaust),Islidintoandfellfastasleep.48.Hekeptme________(inform)ofthechangesinourschool.49.Believeitornot,itmakesno________(different)tomewhatyousay.50.Ittookmeafewweekstogetusedtomynew____...
2020-06-22
问题详情：46.Haveyoumadean_______tohimforbreakinghiswindow?47.Hebeggedfor_____(forgive)forwhathehaddone.48.Reachingthetopofthetower,hewasoutof_______.49.ItissaidYogaisofgreat______tohumanhealth.50.Thepartywillbeheldinthegarden,weather_______(permit).51...
2020-05-08
中文谷![已知函数f(x)＝x2＋2ax＋3，x∈[－4,6]．(1)当a＝－2时，求f(x)的最值；(2)求实数a的取...](https://i3.zhongwengu.com/3405cd9449c51ec465/3515c68f/3e57c4/675497d21f950bc3771e-s.gif "已知函数f(x)＝x2＋2ax＋3，x∈[－4,6]．(1)当a＝－2时，求f(x)的最值；(2)求实数a的取...")
