46.最值的精选

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...

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____________makingthe...

问题详情：46.Wecanstarttheworknextweek___________________(如果必要的话).47.  _________________________________________________(就我而言),thingsaregoingsmoothly.48.  Whenyou__________________________...

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...

问题详情：46.Haveyoumadean_______tohimforbreakinghiswindow?47.Hebeggedfor_____(forgive)forwhathehaddone.48.Reachingthetopofthetower,hewasoutof_______.49.ItissaidYogaisofgreat______tohumanhealth.50.Thepa...

问题详情：46.ThoughIhavefailedacoupleoftimes,Iwon’tgive______.47.Hardlyhadwesatdowninthetheater______theperformancebegan.48.Lackofmoney,theclubhastoput_______theiractivitytonextmonth.49.Shemeans_______...

问题详情： 46.Ihavemadealotofgoodfriends        Icametothisschool.47.Lindausedtobetooshytospeakin        ,butnowsheisoutgoing.Themanasked        ,“Couldyoupleasetellmewheretheb...

问题详情：46.Itisrequiredthatthefirmr__________(改革)itsunfairsalarystructure.47.  Thevicepresidentindicatedthatalla_________forthepostshouldhaveamaster’sdegree.48.  Thereisagreatdriveway_________o...

问题详情：Oncetherelivedarichman   46   wantedtodosomethingforthepeopleofhistown.   47   firsthewantedtofindoutwhethertheydeservedhishelp.    Inthecentreofthemainroadintothetown,heplaced...

问题详情：    （46）  Youprobablythinkyouwillneverbeatopstudent；Thisisnotnecessarilyso.however,Anyonecanbecomea betterstudent ifheorshewantstoHere'show.    PlanyourtimecarefullyWhenplanningyourw...

问题详情：46.Stand-upisakindofcomedywhoisdoneonastagebyacomedian.47.Peoplearoundtheworldenjoywatchcomedies.48.SangLanhasadaptedhernewlifesuccessfully.49.Laughterisgoodforourhealthy.50.Well,it’stimeforI...

问题详情：46.Sheaskedmeto_________(陪伴)hertotheairport.isgenerallyacceptedthatweshouldraiseour________(意识)ofprotectingtheenvironment.r_________(建议)readingthebookbeforeseeingthemovie.49.O_______(忙...

问题详情：youdevelopAIDS,yourchancesof__________(survive)areverysmall.Iwasyoung,Ididn’tknowmuchabouttheharmful_______(affect)ofsmoking.eadvicemighthelpyoutostopand___________(strong)yourdetermination.i...

问题详情：It’snormaltowakebrieflyduringthenight. 46 Butifyou’rewakingupduringthenightandhavingtroublefallingbackasleep,thefollowingtipsmayhelp.Stayoutofyourhead.Thekeytogettingbacktosleepiscontinuin...

问题详情：      Thetruth 46 treesarevitaltoourlifeisnotasecret.Theyprovideuswithfood,woodandmost47 (important),oxygen.Nowthereisonemorethingwecanaddtothislist—blockingoutharmfulbacteriafromwat...

问题详情：46.Post1isaimedatpeoplewhowantto_______.  A.maketheirmomshappy       B.enjoyeatinghamburgers   C.havecheapmealsoutside      D.eatchickenseafood47.Theunderlinedword“REWARD”i...

问题详情：46．Therewassuchalongqueuewaitingfortheticketsande_______________wegaveup．47．Thebadweatherisreportedtohavecontributedtothepassengerplane__________（坠毁）．48．Afterwhatseemedalongtime,theyfinallyarriveda...

Thechylehaddisappeared46dayspostoperatively.Thecorporatetaxratealsofellto34%from46%.Eachcellofourbodiescontains46chromosomes.Bohrat46wasthegrandoldman.Note:foraccessoriesassembling,refertodiagraminpag...

问题详情：46.Theteachersarestrict________theirpupils.47.Wethink_________necessarytomasteraforeignlanguage.48.Therearetimes__________weneedquietandpeace.49.BeijingwasthefirstcityinChina__________(hold)th...

问题详情：46.IntheUSA,ColumbusDayinmemoryofthe________________(到达)ofChristopherColumbusintheNewWord.47.Themostenergeticandimportantfestivalsaretheonesthat________________(盼望)theendofwinterandtotheco...

问题详情：46.LiMingis_______(optimism)abouthisfuture.47._______(exhaust),Islidintoandfellfastasleep.48.Hekeptme________(inform)ofthechangesinourschool.49.Believeitornot,itmakesno________(different)tomew...

问题详情：   ParisisthecapitalandlargestcityofFrance,  46   (situate)ontheRiverSeine.TheEiffelTower,  47   famoussymbolofParis,isthemostpopularplacefortourists.TheLouvreislocatedinParisaswe...

问题详情：Everycountrysharesthings  46  common:wevaluefamilyandlaughter,cherishfoodandhealth,andcelebratelarge  47  (festival)andtraditions.Yetwithinthesimilarthingsweshare,thereareuniquepartsof...

问题详情：46．Becauseofthecomputer,nowwecan____________（交流）withotherpeopleontheInternet.47．Ourworkmatehasbeenindanger.We’reall___________（关心）abouthishealth.48．ThoughIhaven’tmethimformanyyears,Icould______...

问题详情：46. Childrenincitiescanreceivehigher___________(educate).47. A___________(smell)gascameoutofthewell.48. ThetrafficruleinEnglandaredifferetfromthoseoftheother_______(Europe)countries.49. We...