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0.7和0.70的大小相等,意义不同. .(判断对错)
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Whatmakesagoodstudent? InChinamostteacherssharethisopinionthatagoodstudentissomeonewhogetsgoodgradesinexams.Howeveroneteacher1callShenHonghasadifferentattitude.Shesays2hatestoseeherstudentsstudydayandnightunderthepressureofexams.Itisnotright3judgeastudentonlybyhisgrades.ShenHongthinksagoodstudentshouldhavethe4followqualities. Honestyandkindnessareamustforagoodstudent.Ifhe5dosomethingwrongheadmitshismistakeandthenwill6quickapologize.Agoodstudentisalwaysreadytohelphisfriends7theyareintrouble.Agoodstudentisonewho8focusonhisstudies.Hemakesfulluseofhistimetolearnbothinandoutofclass.9studyinghealsolikessportandtakespartinafterschool10activity.Inconclusionhedevelopsinanallroundmanner.
下面是某同学对多项式x2-4x+2x2-4x+6+4进行因式分解的过程.解设x2-4x=y原式=y+2y+6+4第一步=y2+8y+16 第二步=y+42 第三步=x2-4x+42 第四步请问1该同学第二步到第三步运用了因式分解的.A.提取公因式法 B.平方差公式C.两数和的完全平方公式 D.两数差的完全平方公式2该同学因式分解的结果是否彻底填彻底或不彻底.若不彻底请直接写出因式分解的最后结果.3请你模仿以上方法尝试对多项式x2-2xx2-2x+2+1进行因式分解.
TheMayanIndianslivedinMexicoforthousandsofyears.TheMayaweresobrightthattheyachievedalot.Theyhadfarmstemplesandcitieswithmanybuildings.Theyknewmuchaboutnatureandtheworldaroundthem.Thisknowledgehelpedthemtoliveabetterlifethanmostpeopleofthattime. InancientMexicothereweremanysmallclearingsintheforest.Ineachclearingwasavillagewithfieldsofcropsaroundit.TheMayaplantedseedsaftertheyclearedtheland.Afarmerwasabletogrowcropsthatproducedforseveralpeople.ButnoteveryMayahadtobeafarmer.Somewerebuildersorpriests祭司. TheMayabelievedinmanygods.Theybuiltlargetemplestohonorthem.Skillfulworkersbuiltcitiesaroundthesetemples.Itwasdifficultbecausetheyhadtocarryallofthebuildingmaterialsthemselves.TodaymanyoftheseancientMayancitiesandtemplesarestillstanding. AlthoughtheMayaworkedhardtobuildthebeautifulcitiesveryfewofthemlivedinthem.Usuallyonlythepriestslivedinthecities.Theotherpeoplelivedinsmallvillagesintheforests.Theirhousesweremuchsimpler.MostMayalivedasimplelifeclosetonature. Aroundtheyear800theMayalefttheirvillagesandbeautifulcitiesnevertoreturn.Nooneknowswhythishappened.Theymayhavediedfromadeadlydisease.Theymayhaveleftbecausethesoilcouldnolongergrowcrops.ThelostsecretsoftheMayaarestillbeyondthereachofmodernpeople.Theyarestilloneofourgreatestmysteries. 25.TheMayalivedbetterthanmostpeopleoftheirtimesbecause. A.theyhadskillfulworkers B.theybelievedinmanygods C.theyknewbetteraboutnature D.theycouldmeasuretimecorrectly 26.Itcanbeinferredfromthepassagethat. A.thepriestswerenothighlyrespectedbytheancientMaya B.theancientMayancitiesandtempleswerewellbuilt C.theancientMayanpeopleledahappylifeinthecities D.theancientMayanpeoplediedfromaseriousdisease 27.TheunderlinedwordTheyinthelastparagraphrefersto. A.theMayanpeople B.theMayanvillages C.theMayancities D.thelostsecretsoftheMaya 28.Whichofthefollowingwouldbethebesttitleforthispassage? A.TheCitiesoftheMaya B.TheBeliefoftheMaya C.TheMaya D.TheBuildingsoftheMaya.
因式分解2am2-8a=
如图从边长为a的大正方形中剪掉一个边长为b的小正方形再将剩下的阴影部分剪开拼成右边的长方形.根据图形的变化过程可以验证下列哪一个等式成立A.a-b²=a²-2ab+b² B.aa+b=a²+ab C.a+b²=a²+2ab+b² D.a-ba+b=a²-b²
已知a+=5则a²+的值是
计算-2100+-299的结果是A.2 B.-2 C.-299 D.299
Hewouldrathertoliveinthecountrythaninthecity..
Morethangreatdrinksgreatrewards EnjoyallthebenefitsandmorewithyourmembershiptoourLoyaltyProgram! Wheneveryoupaywithyourmembershipaccountyou'llearnaStar. CollectmoreStarsearnmorerewards. Threewaystojoinus BuyaStarbucksCardhandytocreateanaccount. TrackyourStarsonlineorthroughthemobileappandwe'llsendanemailwhenyou'veearnedareward. Youcanalsojoinfromyourphone. DownloadtheStarbucks®App. OneofthemostexcitingbenefitsofbeingamemberisusingourmobileapptopayforpurchasesviewyourStarsandrewardsaccessiTunes®PickoftheWeekseecurrentoffers. Oryoucanjoinwithspeciallymarkedcoffeepurchasedatthegrocerystore. EnteryourStarcodelimit2perday. LookfortheStarcodesymbolonspeciallymarkedStarbucks®productswhereyoubuygroceries. Threelevelswithincreasinglygreaterrewards ToreacheachlevelinourLoyaltyProgramyouneedtocollectmoreStars.RemembertoearnaStaryoumustpaywitharegisteredStarbucksCard. Welcomelevel ToearnyourfirstrewardsjustregisteraStarbucksCard. Birthdaydrinkortreatonusbirthdaycoupon优惠券for15%offapurchaseatStarbucksStore.com. Greenlevel Collect5Starswithin12monthsandyou'llbeintheGreenlevel. WhatisincludedintheWelcomelevelplus ★Freein﹣storerefillsonhotoricedbrewedcoffeeortea Goldlevel Collect30Starswithin12monthsandyou'reattheGoldlevel. WhatisincludedintheGreenlevelplus ★Afreefoodordrinkitemafteranother12Starsearned ★PersonalizedGoldCard 21.Whichofthefollowingisawayyoucanapplyformembership? A.ToupdatetheStarbucks®Appfromtheofficialwebsite. B.TobuyaStarbucksCardoverthephone. C.ToenteraStarcodefromspeciallymarkedStarbucks®products. D.TobuyadrinkataStarbucksonweekends. 22.Ifyoucollect40starswithin12monthsyoucangetthefollowingrewardsexcept. A.YouwillhavethePersonalizedGoldCard B.Freein﹣storerefillsonhottea C.birthdaycouponfor15%offapurchaseonitswebsite D.afreefood 23.What'stheauthor'sintentiontowritethepassage? A.tointroducethewaystojoinStarbucks B.toinformpeopleofthewaystocollectmoreStars C.totellpeopletherewardsofbeingamemberofStarbucks D.toencouragepeopletobeamemberofStarbucksandcollectStars.
简便计算20192-2019×4036+20182
已知xa=3xb=5则x3a-2b=
因式分解-3x³y²+6x²y³-3xy4
请根据上下文内容将文中划线部分译成汉语或者英语并将答案转写到答题卡上. TheChineselanguagediffersfromWesternlanguages.61inthatinsteadofanalphabetitusescharacterswhichstandforideasobjectsordeeds.Chinesewordsareformedbyputtingtogetherdifferentcharacters.Inmanycasesasinglecharactercanalsomakeupaword.ThehistoryoftheChineselanguagecanbeexaminedbylookingat62这些汉字是如何发展的. Chinesewritingbeganthousandsofyearsago.AccordingtoanancientstoryamannamedCangJieinventedChinesewriting.Afterseeingthetracksofanimalsinthesnowandobservingthattheappearanceofeachonewasdifferent63hehadtheideathathecouldusedifferentshapestorepresentdifferentobjects.ThefirstChinesecharactersweredrawingsofphysicalobjects.Somecharactershavebeensimplifiedandothershavebeenmademoredifficultovertime.Howeverasawholethecharactershavedevelopedfromdrawingsintostandardforms.64并非所有的汉字都从物体的图画演变而来.65Sometimestoexpressideassomecharactersweremadebycombiningtwoormorecharacterstogether.
Ifyoucanbuyaperson'sfriendshipit'snotworthhave..
已知如图在△ABC中∠C=90°AD是∠BAC的平分线DE⊥AB交AB于EF在AC上BD=DF.若AF=3EB=2则AB=
Worldrecordscanbesetevenifyouareover100yearsold. RobertMarchandwasbornin1911innorthernFrance.Heenjoysridingabicycleandstartedcyclingseriouslywhenhewasinhis60s.Marchandisnow105yearsold. OnWednesdayacrowdgatheredattheVelodromeNationalabout30kilometersoutsideofParis.Theyweretheretoseehowfarhecouldtravelinonehour. TherecordforonehourisheldbyBritain'sBradleyWigginsaformerTourdeFrancewinner.Wigginscovered54.5kilometersin2015.EvelynStevensoftheUnitedStatesholdsthewomen'srecord.Shewentalmost48kilometersinanhourlastyear. In2012Marchandsetarecordforridersover100yearsoldwhenhetraveledalmost27kilometersinanhour.SothequestionmanypeopleaskedthisweekwasCouldhebreakhisownrecord?Marchandsetoffonhisrecordattemptassportsloverscheeredandphotographerswatched.Hemovedslowlybutsteadilyaroundthecyclingtrack. Marchandisrelativelysmall.Heisonly1.52meterstallandweighs52kilograms.Whenthehourendedhecompleted92timesaroundthetrack.Thatisjustover22.5kilometers. AftertheeventMarchandsaidhecouldhavedonebetter.Hedidnotseehistrainerstellinghimheonlyhad10minutesremaining.Iwouldhavegonefaster.Iwouldhavepostedabettertimehesaid. Butthenewswasstillgoodashedidsetanewrecordforriders105﹣years﹣oldorolder.I'mnowwaitingforarival对手hesaid. 21.Themainpurposeofthefirstparagraphistotellreaders. A.anunbelievablefact B.bringinthetopicofthetext C.anypersoncansetaworldrecord D.settingaworldrecordisnotsodifficultaspeoplethink 22.WhichwordcanbestdescribethefeelingofMarchandjustaftertheevent? A.TiredB.ProudC.RegretfulD.Depressed 23.WhichofthefollowingstatementsisNOTtrue? A.BradleyWigginssetthecyclingrecordin2015 B.RobertMarchandistherecordholderofcyclingover100yearsold C.Thewomen'srecordofcyclingrecordwassetbyEvelynStevensin2016 D.ThoughMarchanddidn'tperformaswellasbeforehestillsetarecordofcyclingthisyear. 24.Whichofthefollowingwell﹣knownsayingsbestexpressesthemessageofthetext? A.Experienceisthebestteacher. B.Youcan'tteachanolddognewtricks. C.Abirdinthehandisworthtwointhebush. D.Oldpeoplemaystillcherishhighaspirations.
Tipsforhealthyskin http://www.mayoclinic.org/healthy﹣lifestyle/adult﹣health/in﹣depth/skin﹣care/art﹣20048237 Goodskincareandhealthylifestylechoicescanhelpdelaythenaturalagingprocessandpreventvariousskinproblems.Getstartedwiththesefourtips.36 ◆Don'tsmoke Smokingmakesyourskinlookolderandcontributestowrinkles.Smokingnarrowsthetinybloodvesselsintheoutermostlayersofskinwhichdecreasesbloodflow.37Smokingalsodamagesthefibersthatgiveyourskinstrengthandelasticity.Besidestherepetitivefacialexpressionsyoumakewhensmokingcancontributetowrinkles. ◆Managestress Uncontrolledstresscanmakeyourskinmoresensitiveandcauseotherskinproblems.Toencouragehealthyskinandahealthystateofmindtakestepstomanageyourstress.Setreasonablelimitscutdownonyourto﹣dolistandmaketimetodothethingsyouenjoy.38 ◆Haveahealthydiet Ahealthydietcanhelpyoulookandfeelyourbest.39Theassociationbetweendietandacneisn'tclearbutsomeresearchsuggeststhatadietrichinvitaminCandlowinunhealthyfatsandprocessedorrefinedcarbohydratesmightpromoteyounger﹣lookingskin. ◆40 Oneofthemostimportantwaystotakecareofyourskinistoprotectitfromthesun.Alifetimeofsunexposurecancausewrinklesagespotsandotherskinproblemsaswellasincreasetheriskofskincancer. A.Getstartedwiththesefourtips. B.Protectyourselffromthesun C.Trytostayindoorsasoftenaspossible. D.Don'teatanythingthatcontainsfatoroil E.Theresultsmightbemoredramaticthanyouexpect. F.Eatplentyoffruitsvegetableswholegrainsandleanproteins. G.Thisdepletestheskinofoxygenandnutrientsthatareimportanttoskinhealth.
阅读下面的题目及分析过程并按要求进行证明.已知如图E是BC的中点点A在DE上且∠BAE=∠D.求证AB=DC.分析证明两条线段相等常用的方法是应用全等三角形或等腰三角形的判定和性质观察本题中要证明的两条线段它们不在同一个三角形中且它们分别所在的两个三角形也不全等.因此要证AB=DC必须添加适当的辅助线构造全等三角形或等腰三角形.现给出如下三种添加辅助线的方法你选择哪种方法并对原题进行证明.
已知2a-b=2那么代数式4a²-b²-4b的值是A.6 B.4 C.2 D.0
计算3a+2b²-3a-2b3a+2b
如图1是一个长为4a宽为b的长方形沿图中虚线用剪刀平均分成四块小长方形然后用四块小长方形拼成一个回形正方形如图2.1图2中的阴影部分的面积为2观察图2请你写出a+b²a-b²ab之间的等量关系是3根据2中的结论若x+y=7xy=12则x-y=4实际上通过计算图形的面积可以探求相应的等式.根据图3写出一个因式分解的等式
Theuniquecoloration自然花纹ofthegiantpandathatislovedbymanypeoplehaslongbeenamysterytoscientists.Butnowajointresearchteambelievestheyhavesolvedthemysteryonceandforall. Theblackandwhitepatchesonthegiantpandamainlyhavetwofunctions﹣camouflage伪装andcommunicationthejointresearchteamfromUniversityofCaliforniaDavisandCaliforniaStateUniversityLongBeachexplains. Thegiantpanda'swhitefacethebackofearthebackoftonguebellyandrump臀部areadaptedforcrypsis隐蔽againstasnowybackgroundwhereasitsblackshouldersandlegsareadaptedforcrypsisinshadeaccordingtothestudythatthejointresearchteampublishedinthejournalofBehavioralEcologyonFeb.28. Howeverdarkmarkingsontheheadarenotusedincrypsisbutincommunicationdarkearsmaybeinvolvedwithsignalingintentionaboutaggressivebehaviorwhiledarkeyemarksmayserveinindividualrecognitionaccordingtothestudy. Thereisnostrongevidencefortheirfurcolorbeinginvolvedintemperatureregulationdisruptingtheanimal'soutlineorinreducingeyeglarethestudyexplains. Understandingwhythegiantpandahassuchstrikingcolorationhasbeenalong﹣standing存在已久的probleminbiologythathasbeendifficulttotacklebecauseactuallynoothermammalhasthisappearancemakinganalogiesdifficultsaidDr.TimKaroaprofessorfromtheUniversityofCaliforniaandtheleadresearcher. 1Whichofthefollowingbodypartsofpandasserveasintentionofviolence? A.Darkears. B.Whiteface. C.Whitebelly. D.Thedarkmarkingsonthehead. 2Theunderlinedwordtackleinthelastparagraphisclosestinmeaningto. A.analyze B.solve C.discover D.face 3WhichofthefollowingstatementsisFALSE? A.Thewhitelegsareusedfordisguiseinshade. B.Thedarkeyemarksmayactasindividualrecognition. C.Thefurcolorofapandaisinvolvedintemperatureregulation. D.Thewhiterumpofthepandaisusedfordisguiseagainstasnowybackground. 4Wherewouldyoubemostlikelytofindthetext? A.asciencefiction B.Children'sliterature C.anofficialdocument D.asciencereport
计算-2a2bc3的结果是A.-2a6b3c3 B.8a6b3c3 C.-8a6b3c3 D.8a6b3c
假如你是李华.最近你在网上看到了你的英国好友Mike给你发来的帖子诉说自己在考试前总是感到很紧张身心健康也受到了影响为此很苦恼.请你给他回帖提出一些建议. 内容要点 1.心态良好睡眠充足 2.均衡饮食积极运动 3.其它建议至少两条. 注意 1.字数110左右 2.可以适当增加细节以使行文连贯. 3.信的开头和结尾己给出不计入总词数. DearMike Asiswell﹣knowntoallphysicalandmentalhealthisofgreatsignificancetosuccessinexams. Bestwishesandstayhealthy. Yours LiHua.
Excusedfromrecyclingbecauseyouliveinahighrisewitharubbishchute垃圾滑槽Youwon'tbelong.Miami'sMarkShantzishasmadeitsimpleforthoselivingintallbuildingstousethechuteandrecycletoo. InShantzis'sHi﹣RiseRecyclingSystemachuteleadstoapie﹣shapedcontainerwithsixboxesthatcanturnaroundwhenoperated.Thesystemwhichfitsinthesamespaceasthechuteandcontainernowinuseenablesglassplasticpapermetalandotherrubbishtogointoseparateboxes. Thesystemiscontrolledfromaboardfixednexttothechutedoor.Theboardhasabuttonforeachclassofrecyclingmaterialsaswellasforunrecyclables.Atthepressofabuttonamicrocomputerlocksallotherchutedoorsandsetstherecyclingcontainerturninguntiltherightboxcomesunderthechute.Thecomputeralsocountstheloadsandgivesasignalbyphonewhentheboxisfull.Andaparticularpieceofequipmentbreaksupthenon﹣recyclables. Sortingrecyclablesbeforetheyarecollectedsavestheuseofexpensivematerialsrecoveryequipmentwhichotherwisehastodothesorting.Suchequipmentoftenmakesrecycledmaterialsveryexpensivesoexpensivethattonsofrecyclablesremainwasted.Shantzisbelieveshissystemcouldhelprecycledmaterialsbecomemorecost﹣effective. 28.Thepurposeinwritingthistextis. A.tointroducearecyclingsystemforhighrises B.toencouragepeopletorecycletheirrubbish C.todescribetheuseofcomputertechnologyinrecycling D.toexplaintheneedforrubbishcollectioninhighrises 29.WhenhesaysYouwon'tbelong.thewritermeansthat. A.you'llsoonbelivinginacleanerbuilding B.rubbishchuteswillbecomeoutofdatebeforelong C.itwon'tbelongbeforeyouhavetorecycleyourrubbish D.youwon'twaitlongforyourturntorecyclerubbish 30.Beforedroppingrubbishintothechuteyouhaveto. A.locktheotherfloors'chutedoors B.pressthecorrectbutton C.checkifthecontainerisfull D.breakuptherubbish 31.Thebiggestadvantageofthisnewsystemisthat. A.itmakesbetteruseoftheexistingrecoveryequipment B.itreducesthecostofrecycling C.itsavestimeandspace D.itsavesmoneyforpeoplelivinginhighrises.
计算322+124+128+1232+1+1=
AGapYearisaperiodoftimewhenastudenttakesabreakbeforegoingtouniversity.Itisoftenspenttravelingorworking.Itcangiveyoungpeopleusefullearningexperiencesandnewskills.It'sverypopularinforeigncountries. 33 Althoughyoudon'thavetogoabroadtoexperiencegapyearsmostgapyearstudentscatchthechancetotravelabroad.Youareabletoworkoutwhoyouareandwhatyouarefor.Theexperiencesofdifferentculturesofferyouinterestinglessons.Youcanlearnmoreabouttheworldandgettoknowyourselfbetter. 34 Agapyearisnotonlyatimetotakeavacationbutalsoatimeofchallenges.Gapyearstudentsusuallyworkvolunteerortakeserviceprojects.Youhavetolearnhowtogetalongintherealworld.Thisprocessisn'talwayseasybutitisanimportantpartofgrowingup.Onlyinthiswaycanyouenjoylifeandhavefun. 35 There'sacommonthoughtthatgapyearsareonlyforrichstudentsbutit'snottrue.Actuallytakingagapyearcansaveyoualotofmoney.Gapyearstudentsoftentakeaparttimejob.Besidesattheendofagapyearstudentsaremuchmorelikelytoknowwhattostudyincollege.Clearlearninggoalscankeepthestudentsworkinghardinsteadofwastingtimeandmoney. A.Learnabouttheworldandyourself. B.Savemoney. C.Findaparttimejob. D.Facechallengesandhavefun.
计算[4y2x-y-2x2x-y]÷y-2x
因式分解x2+12-4xx2+1+4x2.
TristandaCunhaa38﹣square﹣mileislandisthe61farinhabitedislandintheworldaccordingtotheGuinnessBookofRecords.Itis1510milessouthwestof62itnearestneighborSt.Helenaand1950mileswestofAfrica.DiscoveredbythePortugueseadmiral葡萄牙海军将ofthesamenamein1506theislandbelongstoGreatBritainandhas63populationofafewhundred. Cominginaclosesecond﹣andoften64wrongmentionedasthemostdistantland﹣isEasterIsland65lies1260mileseastofitsnearestneighborPitcaimIslandand2300mileswestofSouthAmerica. Themountainous64﹣square﹣mileisland66settlearoundthe5thcenturysupposedly据说bypeoplewhowerelostatsea.Theyhadno67connectwiththeoutsideworldformorethanathousandyearsgivingthemplentyoftime68buildmorethan1000hugestonefigures69callmoaiforwhichtheislandismostfamous. OnEasterSunday1722howeversettlersfromHollandmovedinandgavetheislanditsname.Today2000peopleliveontheChileanterritory智利领土?Theyshareonestreetasmallairport70afewhoursoftelevisionperday.
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