首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
用因式分解法解下列方程：x2-x-2=0
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
用因式分解法解下列一元二次方程x2－3x＝0
用因式分解法解方程4x2x+1=32x+1
用因式分解法解方程2xx－3＋x－3＝0
用因式分解法解方程3xx－1＝2－2x时可把方程分解成______________.
用因式分解法解方程3x－52=25－x
用因式分解法解下列方程xx-1+3x-1=0
解下列方程①2x2－18＝0②9x2－12x－1＝0③3x2＋10x＋2＝0④25x－12＝25x－
①直接开平方法，②配方法，③公式法，④因式分解法
①直接开平方法，②公式法，③、④因式分解法
①因式分解法，②公式法，③配方法，④因式分解法
①直接开平方法，②、③公式法，④因式分解法
解下列方程3xx-2=2x-4用因式分解法
用因式分解法解下列一元二次方程2x－1＋xx－1＝0
用因式分解法解下列方程7x3-x=2x-3
用因式分解法解下列方程 4xx-1=3x-1
用因式分解法解下列方程x3x+2-63x+2=0
用因式分解法解下列方程．3x+2=2xx+2．
用因式分解法解下列方程xx-1+3x-1=0
用因式分解法解下列方程xx+1-5x=0
用因式分解法解下列一元二次方程4x2x－1＝32x－1
用因式分解法解下列方程 x-2=xx-2
阅读理解例如因为x2＋5x＋6＝x2＋2＋3x＋2×3所以x2＋5x＋6＝x＋2x＋3.所以方程x2
用因式分解法解下列方程xx+1-5x=0
用因式分解法解方程.13x－2＝5xx－2
热门试题
更多
如图直线y＝4﹣x与双曲线y＝交于AB两点过B作直线BC⊥y轴垂足为C则以OA为直径的圆与直线BC的交点坐标是．
分解因式x2+2x+1＝．
30分Two﹣year﹣oldNancyisdeaf.Howeverthathasn'tstoppedherfrombeingan1littlegirltryingtochattoanyoneshemeets.Assoonasshegoesoutintotownwithherparentsshestarts2inthehopethatthepersonsheistalkingto3signlanguagetoo. Normallyhearinglossisasocial4forthosewhodon'tknowhowtousesignlanguage.AnyoneNancytriedtotalkto5thisandfeltsosorrytheycouldn't6.Theywishedtheycould7herandsaysomethingbackbuttheyfoundthemselvescompletely8. Thensomethingamazinghappened.Insteadofcausinga9thisbarrierbroughtthecommunity社区together.Determinedto10signlanguagesothattheycouldtalktoNancyher11hiredaninstructorontheirownandnowtheyare12totakingclassestogether.Theteacher13thatthisisreallyremarkablebecausequiteofteneventheparentsofdeafchildrendon't14tolearnthelanguage.ButhereNancyhasafullcommunitythatissigningandcommunicatingwithheranditisa15story. TheteacheralsosaysthatthislevelofinclusionwillmakeahugedifferenceinNancy's16.Italmostcertainlyguaranteesthatshewillbeahappierandmore17individualinthefuture.Nancy'sparentsarealreadynoticinga18intheirdaughterandtheyhavenowordstoexpresshow19theyaretotheirneighbors. Withalittlegirlandalotoflovetheneighbors20maketheneighborhoodacommunity. 1A.independent B.helpful C.outgoing D.generous 2A.signing B.cheering C.waving D.smiling 3A.accepts B.appreciates C.recognizes D.knows 4A.mistake B.barrier C.conflict D.stress 5A.discussed B.ignored C.realized D.denied 6A.respond B.apologize C.return D.agree 7A.inspire B.protect C.trust D.understand 8A.atrisk B.insurprise C.ataloss D.inahurry 9A.debate B.separation C.complaint D.panic 10A.create B.learn C.translate D.improve 11A.classmates B.parents C.teachers D.neighbors 12A.devoted B.opposed C.accustomed D.addicted 13A.warns B.predicts C.admits D.regrets 14A.fail B.bother C.hesitate D.refuse 15A.relaxing B.popular C.satisfying D.beautiful 16A.plan B.hearing C.life D.opinion 17A.well﹣adjusted B.mature C.well﹣behaved D.considerate 18A.potential B.belief C.strength D.difference 19A.friendly B.grateful C.important D.familiar 20A.truly B.almost C.merely D.even
2019年“五一”假期期间我市共接待国内外游客140.42万人次实现旅游综合收入8.94亿元则“旅游综合收入”用科学记数法表示正确的是
8分Learninghowtofacesilenceinconversationisanimportantskillespeciallywhenworkingacrosscultures. Ininternationalnegotiationsexperiencednegotiator谈判者staysilentandimpassiveonpurposebecausethatwillmakeothersfeeluncomfortableandpossiblymakecompromiseswithouthavingtodoanything.Americansespeciallycan'tstandsilencesotheyoftenarethefirsttobreakthesilenceandsometimesmightbeatadisadvantageinnegotiations. Sowhat'sthebestresponse?Setyourjawandwaititout.Don'tofferacompromisejustbecausetheyarenotspeaking.IfyouhavetosaysomethingaskadirectquestionsuchasWhat'syourinitialreactiontothatoffer?Onceasilenceisgettinginto45secondsyoucouldsayLet'scomebacktothatinaminuteandgoonwiththenextpartofournegotiation. Inpresentationssilencecanbefarmoreeffectivethandramaticpassion热情.BeforestartinglookattheaudienceandbesilentforamomentbecausethatsaysI'mincontrol.IknowwhatI'mdoing.I'mconfident. AclassicexamplewaswhenAppleco﹣founderSteveJobslaunchedthefirstiPhone.Heintroducedwithmanypausessothatyoudidn'tmisshiskeypoints.Becausesilencemakesusnervousournaturalreactionisthatwe'dbetterpayattentionthere'ssomethinggoingonhere. Equallywhengivingaspeechtostaffortraineespausescount﹣especiallyiftherearenegatives.Ifyoukeeptalkingyou'respoonfeeding.Givepeopleamomentofsilencetogetbeyondtheemotionalresponseandtostartthinkingconsciouslyandprocessing. Silencecanbeaninward﹣focusedthoughtfulactivityoranoutwardstillnesswhereyougiveyourselfthetimetowatchandthinkandlistentotheworldaroundyou.HavingobservedtheuseofsilenceinFinlandandalsoamongtheBlackfeetNationaNorthAmericanIndiantribeinnorthernMontanaintheUSwecanseebenefitsfarbeyondwheelinganddealing. Silencecanbeaverypowerfulpointforunderstandingourselvesunderstandingothersfordevelopingbettercommonunderstandingandmoreproductiveoutcomesandthatappliestobusinesspoliticseducationlawmedicineeveryareaofhumanlife. 1WhatismostlikelytobeAmericansidea? A.Speakinglessgivestheupperhand. B.Theshortertalkinggapsarethebetter. C.Asilentmanisthebestonetolistento. D.Speakoutwhatyouhaveinyourmind. 2WhatisthepurposeoftheexampleofSteveJobs? A.ToshowthewisdomofSteveJobs. B.Toexplainsilencecanbemoreeffective. C.Tointroducehowtomakeapresentation. D.Toprovesilencecaneaseone'snervousness. 3WhatisthemeaningoftheunderlinedwordsspoonfeedinginParagraph6? A.Supportingsomepersonwithanyselflesshelp. B.Feedingsomebodypatientlywithasmallspoon. C.Givingotherssomenewideastothinkovercarefully. D.Usingawaythatdiscouragesindependentthought. 4Whatisthemainideaofthepassage? A.Silenceisthebestdefense. B.Silenceinnegotiationsisofgreathelp. C.Learningtheskillsaboutsilenceisimportant. D.Silencehasdifferentmeaningsindifficultculture.
在平面直角坐标系xOy中顶点为A的抛物线与x轴交于BC两点与y轴交于点D已知A14B30． 1求抛物线对应的二次函数表达式 2探究如图1连接OA作DE∥OA交BA的延长线于点E连接OE交AD于点FM是BE的中点则OM是否将四边形OBAD分成面积相等的两部分请说明理由 3应用如图2Pmn是抛物线在第四象限的图象上的点且m+n＝﹣1连接PAPC在线段PC上确定一点M使AN平分四边形ADCP的面积求点N的坐标． 提示若点AB的坐标分别为x1y1x2y2则线段AB的中点坐标为．
已知如图AB＝AEAB∥DE∠ECB＝70°∠D＝110°求证△ABC≌△EAD．
15分Everyonewhohaslivedorworkedoverseasunderstandsthattravelisanenrichingandlife﹣changingexperience1Thatfrustrationoftenstemsfromcultureshockbutbeingabletoidentifythesymptomscanhelpyoueasethediscomfortandanxietyoflivinginanewplace.Therearefourmainstagesofcultureshockwhilestudyingabroadthatoccuratdifferenttimesforeachperson. TheHoneymoonStage.Thisiswheneverythingisnewandfascinatingaboutyourhostcountry.It'satthisstagethatyoumayfallinlovewithItalianpizzaortheIrishaccent.2You'refascinatedbysimilaritiesanddifferencesbetweenthehostcountryandyourhome. TheCrisis危机Stage.Thisiswhenthedifferencesbetweenyourhomecultureandthehostcountrybecomeapparentandfeelingsoffrustration沮丧oranxietyoccurs.Youreallywantajellysandwichtoremindyouofhomebutyourealizeyourhostcountrydoesn'thaveitanywhere.Theydon'tknowyoursenseofhumor.3 4Atthisstageyoubecomefamiliarwithyoursurroundingsanddeveloparoutine.Thesameconcernswilloccurbutyouwillbebetterequippedtohandlethem.Youhavemorefriendsincreasedsocialskillsandyou'veevenbecomeanexploreroftheculture.You'veregainedyourconfidencebecomemoreindependentcompetentandculturallysensitive.TheMasteryStage.Congratulations!You'veadjustedtothehostculture.You'vetakenaninwardandoutwardjourneythathasledtoimmeasurablepersonalgrowth.You'renowabletoliveandworktoyourmaximumpotential. 5YoucanconfidentlyspeakandunderstandmostcolloquialEnglish.You'vedevelopedmeaningfulfriendships.You'vesettled.Youbelong. A.TheDepressionStage B.TheAdjustmentStage C.Nobodyknowstherealyou D.butitcanalsobefrustrating E.butitmaybecostlytoliveinanewculture F.You'renolongerdistressedbyculturaldifferences G.You'rethrilledbynewsightssoundssmellsandevents
下列说法正确的是
反比例函数y＝的图象上有一点P2n将点P向右平移1个单位再向下平移1个单位得到点Q若点Q也在该函数的图象上则k＝．
10分Whetheryou'reflyingtoanislandparadiseortravelingforbusinessthesepackingtipswillhelpyouminimizetimeandmaximizespace. Startwiththeright﹣sizedsuitcase 1.Butifyoucan'ttravellightit'sbesttochooseabagthatcaneasilyaccommodateeverythingyouneed.Tryingtoforceafullsuitcasetoshutisawasteoftimeandenergyespeciallysinceyoumayreturnwithevenmorestuffifyouliketobuysouvenirs. Layeverythingoutbeforestarting Layeverythingyou'retakingoutonthebedsoyoucanseeexactlywhatyouneedtopackandspotanymissingitemspromptly.2.Forfoldeditemsputtinglayersoftissuebetweeneachitemwillcutdownonwrinkles. 3Beginbyputtingrolleditemsinalayeratthebottomofyoursuitcase.Cushionfragileitemslikeperfumebottlesinthemiddle.Plantoputitemsyouneedonarrivalatthetopendofthecase.4 Finishwithalargetoplayer Lastlylayalargeitemlikeatoweloverthetopsandtuckitinaroundthesides.5.It'smucheasiertoclosethezipperifyoudon'thaveitemslikebeltsorlaces. A.Packyoursuitcaseinlayers B.Thenfoldorrolleachitemofclothing C.Takeamomenttoassessyourneedsforthistrip D.Sothey'llbeeasytofindwhenyouneedthem E.Forashorttripasmallcarry﹣onbagisideal F.Geteverythingreadybeforeyoustarttheactualpacking G.Thiswillstopitemsfromslidingaroundduringthejourney
使代数式有意义的x取值范围是．
﹣2的绝对值为
JustasJohnLubbocksaidwemaysitinalibraryandyetbeinallquartersoftheearth.Herearesomeofthecoolestlibrariesoftheworld. StuttgartCityLibrary Despiteaclassicwhite﹣on﹣whitecolorStuttgartCityLibraryisoneofthemostvisuallyappealingmodernlibraries.TheamazingmodemandsimplelookistheproductoftheKoreanarchitectYiEun﹣young.TheGermanlibraryopenedin2011andcostnearly80millioneurostoconstruct. KanazawaUmimiraiLibrary ArchitectsfromtheCoelacanthK&HArchitectsstudiodesignedtheKanazawaUmimiraiLibrarylocreatethebestreadingenvironment.Healedfloorsanoutpouringofnaturallightandotherfeatureswerespecificallyincludedloachievethisgoal.Thewallwhichconsistsofthousandsoftinyopeningsallowsnaturallightingintothebuildingimprovingtheoverallfeelofthespace.ThisJapaneselibrarywasopenedin2011andreflectstheappearanceofmanymodemandsimplespaces. LibraryofCongress In1800CongresssetuptheLibraryofCongressinWashingtonD.C..FifteenyearslaterThomasJeffersonofferedhispersonallibrarytoreplacebooksthatwerelostwhentheBritishsetthebuildingonfirein1814.Hisbookswhichtooknearly50yearstocollectvariedfromtextsonscienceliteratureandphilosophytobooksinavarietyofforeignlanguages.ThesedaystheLibraryofCongressoffersmorethan155millionitemsandthelargestrarebookcollectioninNorthAmerica. StateLibraryofVictoria TheSlateLibraryofVictorialocatedinMelbourneAustraliaisoneofthelargestexhibitinglibrariesintheworld.Thoughitopenedin1856majorrepairstookplacebetween1990and2004.TheLaTrobeReadingRoomisoneofthelibrary'smainattractionsduetoitsvisuallyamazingarchitecture.Thelawnatthelibrary'sfrontattractshundredsofcityfolkeachdaywhogatherforlunchortoenjoythestatuesthere.Thelibrarycurrentlycontainsovertwomillionbooksaswellasarmor盔甲ofNedKellyafolkheroagainsttherulingclass. 1Whichlibraryhasthelongesthistory? A.StuttgartCityLibrary. B.KanazawaUmimiraiLibrary. C.LibraryofCongress. D.StateLibraryofVictoria. 2What'sspecialaboutStaleLibraryofVictoria? A.Ithasgreatarchitecture. B.Ithasafolkhero'sstatueinit. C.Itistheworld'slargestexhibitinglibrary. D.Itservesasameetingplaceforthecitizens. 3Whatdoesthefirsttwolibrarieshaveincommon? A.Theyareconstructedinthemodernstyle. B.Theycostalargeamountofmoney. C.TheyaredesignedbyKoreanarchitects. D.Theyfeatureprovidingreaderswithnaturallight.
12分UniversityofNewSouthWaleshaslauncheditsnew12﹣monthWomeninMaths&ScienceChampionsProgramdesignedtogivewomentheskillsandconfidencetobuildtheirpublicrecognitionandsetupaconnectednetworkofwomeninmathsandscience.Thefirstgroupof30femalePhDstudentsstartedinAugustthisyearandthesecondgroupof19early﹣careerresearcherswasformallyannouncedyesterday. Overthe12monthsthechampionscompleteatleast20hoursofrelatedactivitiesaspartofacommunityofrepresentativeswhowillinfluenceandinspirewomentopursueacareerinmathsandscience.Theactivitiesarevariedrangingfromvisitingschoolsandconductingsciencepresentationstoattendingconferencesandcreatingcontentforsocialmedia.AttheendoftheprogramPhDchampionshavethechancetoapplyeverythingthey'velearnedtothePostgraduateResearchCompetition.Aboveallparticipatingisarequirementforprogramcompletion. RoseO'DeaamemberofthefirstgroupisaPhDcandidateattheSchoolofBiologicalEarthandEnvironmentalSciences.ShesaidI'mexcitedabouttheopportunitytoworkwithschoolchildren.Ihopetoinspiresomegirlssotheyseenotallscientistsareoldermeninlabcoalsandthatscienceisquitediverseandmeansdifferentthingsdependingonwhoyouare. Dr.MarianaMayerPintoisanearly﹣careerresearcherattheSchoolofBiologicalEarthandEnvironmentalScienceswhereshemainlyworkswithmarine海洋的ecologists.SheisoriginallyfromBrazilandsaidthatbeingawomanfromadevelopingcountrymeantsheknewthestrugglesthatlackofrolemodelscancreate.Youcan'tbewhatyoucan'tsee!IalwayshavethehopethatIcanchangetheworldbitbybitandifonelittlegirlsaysshecanbecomeascientistbecauseItalkedtothemthat'dbeawesomeandthatwouldmakeeverythingworthit. 1Whatistheprogramintendedtodo? A.TestfemalePhD'slearningresults. B.Promotetheequalityofmenandwomen. C.Setupanorganizationforwomenscientists. D.Improvewomen'sparticipationinmathandscience. 2Whatisrequiredifaparticipantwanttocompletetheprogram? A.Topersuadeasleastonefemaletotakeupscience. B.Toparticipateinatleast20hoursofrelatedactivities. C.Toapplywhattheyhavelearnttotheirgraduationpaper. D.Toworkasarepresentativetogivepresentations. 3WhatdoesRoseO'Deathinkaboutscience? A.Varied. B.Inspiring. C.Unchangeable. D.Exciting. 4What'sthepurposeofthelastparagraph? A.Tosharehowfamilybackgroundmatters. B.Toshowtheoverallresultsofthisprogram. C.Toaddanexampleofhowaparticipantfeels. D.Totellofrolemodelstoencouragefemalestudents.
25分假定你是李华你的美国朋友Lily所在学校的汉语俱乐部要举办诵经典学汉语ReadClassics&learnChinese活动她给你发邮件征询建议.请你回复邮件内容包括 1.推荐诵读内容 2.推荐理由 3.活动建议. 注意 1.词数100左右 2.可以适当増加细节.以使行文连贯.
计算4sin60°+﹣20190﹣﹣1+|﹣2|．
如图在Rt△ABC中M是斜边AB的中点以CM为直径作圆O交AC于点N延长MN至D使ND＝MN连接ADCDCD交圆O于点E． 1判断四边形AMCD的形状并说明理由 2求证ND＝NE 3若DE＝2EC＝3求BC的长．
计算﹣12019+×sin60°﹣﹣3．
如图已知⊙O是△ABC的外接圆且BC为⊙O的直径在劣弧上取一点D使＝将△ADC沿AD对折得到△ADE连接CE． 1求证CE是⊙O的切线 2若CE＝CD劣弧的弧长为π求⊙O的半径．
某公司有如图所示的甲乙丙丁四个生产基地．现决定在其中一个基地修建总仓库以方便公司对各基地生产的产品进行集中存储．已知甲乙丙丁各基地的产量之比等于4542各基地之间的距离之比abcde＝23433因条件限制只有图示中的五条运输渠道当产品的运输数量和运输路程均相等时所需的运费相等．若要使总运费最低则修建总仓库的最佳位置为
下列运算正确的是
15分ChineseresearchershaveplannedtobuildanairportinAntarcticainNovember.TheChinese1benotveryusedtoflyingtothesouthernmostcontinentbecausethecountrysfirstpolarplanetheSnowEagle6012putintouseonlythreeyearsago. BeforetheSnowEagle601Chineseresearcherstraveledtotheice﹣coveredlandbyshipwhichtooksignificantly3longthanflying.Therearecurrentlymorethan20airportsinAntarcticabutnoneofthembelongtoChina.TheSnowEagle601hastorelyonRussianairports4takeoffandland.That's5theChineseresearchersdecidedtobuildtheirown.BuildinganairportinAntarcticaisverydifferentfrombuildingoneelsewhere.Thecontinentiscoveredbya6constantmovinglayeroficesothebuildersmustfindsomewherethatmovesattheslowestpossiblepaceandina7fixdirection. Thebuildersmanagedtofindaspotbackinearly2017following8toughmeasuringprocessthattookplaceinthestorm﹣likepolarwinds.Thenextproblemisthesnow.Thesoftnatureofsnowmakes9abadmaterialforarunway.Sothebuildersmustuseroadroller﹣like10machinetopressthesnowwhichcanbeverytime﹣consuminginextremecoldness.
8分Almostnoneofushavethetimetoreadeverythingwe'dliketoread.Yetwelosecountlesshourstodailyactivitiesthatbringuslittlejoyliketakingbusesandwaitinginline.Whatifwecouldturntheselittleblocksofunoccupiedtimeintopreciousandrewardingmomentsforlearningandreflection? Foundedin2012iReaderamicro﹣learningapponmobilephonesbringsthebiggestideasfrombest﹣sellingbooksthrough15﹣minuteaudio音频andtext.Sofarmorethan3000bookshavebeenincludedrangingfrompsychologyandparentingtomanagementandeconomicswithnewtitlesaddedeveryday. iReaderispioneeringanewmethodofreadingwithover9millionusersenjoyingthebenefitsalready.AccordingtothePewResearchCenterPRCtheBritishreadjust4paperbooksayearandover25%haven'treadasinglepaperbookthisyearbutreadingisn'tdying.TherearenowmorewaysfortheBritishtoreadthaneverbeforeduetothewidespreaduseofe﹣booksandaudiobooks. ThebooksiniReaderarerewrittentoensureitiseasytorememberthemaincontent.Thewaythecontentiseditedhasbeenspecificallydesignedtoensureitisusefulinpractice.Besidesthecontentisrewrittenwithrelevantexamplesinreallifewhichmeansusersaremorelikelytorememberandapplywhatishelpfultothem. HolgerSeimGermanco﹣founderofthisappdeclaresiReadergivesyouthebiggestideasintheshortestpossibletime.Ittransformsgreatideasintolittlepacksyoucanlistentoorreadinjust15minutes. 1Whatdoestheauthorsuggestpeopledointheunoccupiedtime? A.Readandthink. B.Writeandshare. C.Avoidtakingbuses. D.Bringjoytodailyroutines. 2WhatcanweinferfromthePRCfindings? A.TheBritishbenefitalotfromreading. B.Readingmethodsaremoreimportantthanbefore. C.Digitaltechnologyaretakingtheplaceofpaperbooks. D.NewformsofbooksarechangingthewaytheBritishread. 3HowdoesiReadermakethecontenteasytoremember? A.Bybringingfuntoit. B.Bymakingituseful. C.Byusingartisticdesigns. D.Bytakingusersasexamples. 4Whatisthebesttitleforthetext? A.iReaderPreventsReadingfromDying B.iReaderUnitesWorldwideBook﹣lovers C.iReaderTheBestNewAppCreation D.iReaderBigIdeasinSmallPackages
ApplicationWorkshop JoinCitizensCommitteeforNewYorkCityandtheNYCDepartmentofSanitationforaworkshopontheGreenTeamMini﹣GrantapplicationonFebruary2whichlastsfrom400PMto530PM! Theworkshopwillcover •ApplyingfortheGreenTeamMini﹣Grant •HowtousetheZeroWasteschoolswebsite CreativeCoding WearehostingafreedesignworkshopjustforgirlsonMarch7from430PMto600PMinsupportofInternationalWomen'sDay!ThefocusoftheworkshopisonCreativeCodingwithartandtechnologybutwe'llalsohaveafewfemaledesignerstosharetheiruniqueworkwiththeattendees. Noexperiencenecessarythiseventisforgirlsbetweentheagesof9﹣12. SAT&ACTRoadmaptoSuccess Inthisfree1﹣hourworkshopparentswilldiscovertheroadmaptoSAT&ACTsuccess.TopicsincludedReviewofgoalscoresforSAT/ACTcollegeadmissionsnationaltrendsincollegeadmissionshowtodeterminewhethertheSATortheACTisthebesttestforyourstudentstepstopreparefortheSatorACTbesttimetotaketheSatorACT.JoinusonMarch23. SquareSchoolFamilyInformationNight JoinusforourFamilyInformationNightonMarch14!We'llgatheratthefuturehomeforSquareSchoolforanintroductiontotheschoolmodelat630pm. Thiseventisintendedforfamilieswithyoungpeopleenteringgradessixorsevenin2019thatwanttobeapartofaschoolcommunitythatattachesimportancetoalifestyleoflearning.JoinusforthisFamilyInformationNighttoseeifSquareSchoolistherightchoiceforyourfamily. 1Whichactivityoffersinformationabouttests? A.CreativeCoding B.SAT&ACTRoadmaptoSuccess C.PublicSchoolGreenTeamMini﹣Grant D.SquareSchoolFamilyInformationNight 2WhatisspecialaboutCreativeCoding? A.Itisafreeworkshop. B.IttakesplaceinMarch. C.Itishostedbyfemales. D.Itisdesignedforgirls. 3WhomightbeinterestedinFamilyInformationNight? A.Designers. B.Teachers. C.Parents. D.Students.
为了测量某山如图所示的高度甲在山顶A测得C处的俯角为45°D处的俯角为30°乙在山下测得CD之间的距离为400米．已知BCD在同一水平面的同一直线上求山高AB．可能用到的数据≈1.414≈1.732
已知∠AOB＝60°OC是∠AOB的平分线点D为OC上一点过D作直线DE⊥OA垂足为点E且直线DE交OB于点F如图所示．若DE＝2则DF＝．
某种机器使用若干年后即被淘汰该机器有一易损零件为调查该易损零件的使用情况随机抽取了100台已被淘汰的这种机器经统计每台机器在使用期内更换的该易损零件数均只有891011这四种情况并整理了这100台机器在使用期内更换的该易损零件数绘制成如图所示不完整的条形统计图． 1请补全该条形统计图 2某公司计划购买一台这种机器以及若干个该易损零件用上述100台机器更换的该易损零件数的频率代替一台机器更换的该易损零件数发生的概率． ①求这台机器在使用期内共更换了9个该易损零件的概率 ②若在购买机器的同时购买该易损零件则每个200元若在使用过程中因备用该易损零件不足再购买则每个500元．请你帮该公司用花在该易损零件上的费用的加权平均数进行决策购买机器的同时应购买几个该易损零件可使公司的花费最少
8分AninternationalteamofresearchersfromtheUniversityofOxfordhavefoundthatthewaypeopleusetheInternetiscloselytiedtotheseasonalmovementsinthenaturalworld.Theironlinespeciessearchesfollowthepatternsofseasonalanimalmigrations迁徙. Migratorybirds候鸟floodbacktowheretheyreproduceeveryspring.Thatmigratorybehaviorisaccompaniedbysomehumanbehavior.InEnglish﹣languageWikipedia维基百科theonlinesearchesformigratoryspeciestendtoincreaseinspringwhenthosebirdsarriveintheUnitedStatessaidtheleadauthorJohnMittermeier. Andnotjustbirds.Mittermeierandhisteamsurveyednearly2.5billionWikipediasearchrecordsfor32000speciesacross245languages.Theyalsosawvariablesearchratesforinsectshorsetailsandfloweringplants.SeasonaltrendsseemedtobewidespreadinWikipediabehaviorformanyspeciesofplantsandanimals. Thisfindingsuggestsnewwaystomonitorchangesintheworld'sbiologicaldiversity.Italsoshowsnewwaystoseehowmuchpeoplecareaboutnatureandwhichspeciesandareasmightbethemosteffectivetargetsforconservation. Mittermeierisencouragedbythesearchresults.HecommentedIthinkthere'saconcernamongconservationists生态环境保护者thatpeoplearelosingtouchwiththenaturalworldandthatthey'renotinteractingwithnativespeciesanymore.Andsointhatsenseitwasreallyexcitingandquiteunexpectedformetoseepeople'sWikipediainterestcloselyrelatedtochangesinnature. RichardGrenyerAssociateProfessorfromtheUniversityofOxfordsayssearchdataisusefultoconservationbiologistsByusingthesebigdataapproacheswecandirectourattentiontowardsthedifficultquestionsinmodernconservationwhichspeciesandareasarechangingandwherearethepeoplewhocarethemostandcandothemosttohelp. 1Whathaveresearchersfoundaboutspeciessearches? A.Theystrengthentiesamongpeople. B.Theyaffecttheanimalmovements. C.Theydifferinlanguagebackgrounds. D.Theyreflectanimalmigrationseasons. 2WhatisthepurposeofwritingParagraph3? A.Tosummarizetheresearchprocess. B.Tofurthersupporttheresearchfindings. C.Toshowthevarietyofspeciessearches. D.Topresentresearchers'heavyworkload. 3HowdoesMittermeierfeelaboutthesearchresults? A.SatisfiedwithWikipedia'sservice. B.WorriedaboutWikipediabehavior. C.Amazedatpeople'scareaboutnature. D.Sadaboutpeople'snotgettingclosetonature. 4WhydoesRichardthinksuchsearchdataisuseful? A.Ithelpstoaimatconservationtargets. B.Itincreasesinterestinbigdataapproaches. C.Itkeepstrackoftrendsinbiologists'work. D.Itpushespeopletosolvedifficultproblems.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. ThisafternoonIwenthomebybusasusual.IwaslisteningmusicwhenIsuddenlynoticedthebusstopthatIshouldgetoff.ThenIhurriedoffabus.ButwhenIarrivedhomeIfindthatmywalletwasgone﹣somemoneyandseveralimportantcardwereinit.EagertogetthewalletbacksoIrushedtothebuscompanyforhelp.LuckyattheLostandFoundofficeIsawmywallet.IfeltsoexcitingthatIwantedtothankthepersonwhohadturnedthemin.HoweverIwastoldthemanhadn'tlefthisname.Howagreatman!
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库
高一上学期物理
教案备课库
教案备课库
湘公网安备 43130202000226号