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在△ABC中,沿着中位线DE剪切后,用得到的△ADE和四边形DBCE可以拼成平行四边形DBCF,剪切线与拼图如图1所示.仿照上述的方法,按要求完成下列操作设计,并在规定位置画出图示.(画图工具不限,...
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我们可以将一个纸片通过剪切结合图形的平移旋转翻折重新拼接成一个新的图形.如图1沿△ABC的中位线D
如图DE是△ABC的中位线M.是DE的中点CM的延长线交AB于N.那么S.四边形DBCMS.△DMN
如图DE是△ABC的中位线△ADE的面积为3cm2则四边形DBCE的面积为cm2
如图直角三角形纸片ABC的∠C.为90°将三角形纸片沿着图示的中位线DE剪开然后把剪开的两部分重新拼
平行四边形
矩形
等腰梯形
直角梯形
在△ABC中借助作图工具可以作出中位线EF沿着中位线EF一刀剪切后用得到的△AEF和四边形EBCF
如图在△ABC中AB=4BC=6DE.DF是△ABC的中位线则四边形BEDF的周长是
5
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在△ABC中借助作图工具可以作出中位线EF沿着中位线EF一刀剪切后用得到的△AEF和四边形EBCF
如图DE是△ABC的中位线△ADE的面积为3cm2则四边形DBCE的面积为cm2
如图边长为4的等边△ABC中DE为中位线则四边形BCED的面积为_________
如图沿Rt△ABC的中位线DE剪切一刀后用得到的△ADE和四边形DBCE拼图下列图形①平行四边形②
只有①②
只有③④
只有①③④
①②③④
2014•贵阳如图在Rt△ABC中∠ACB=90°D.E.分别为ABAC边上的中点连接DE将△ADE
如图在△ABC中点D.E.分别是ABAC边的中点连接DE.则△ADE与四边形BCED的面积的比是.
在△ABC中借助作图工具可以作出中位线EF沿着中位线EF一刀剪开后用得到的△AEF和四边形EBCF可
如图在Rt△ABC中∠ACB=90°D.E.分别为ABAC边上的中点连接DE将△ADE绕点E.旋转1
如图直角三角形纸片ABC的∠C为90°将三角形纸片沿着图示的中位线DE剪开然后把剪开的两部分重新拼接
平行四边形
矩形
等腰梯形
直角梯形
如图沿Rt△ABC的中位线DE剪切一刀后用得到的△ADE和四边形DBCE拼图下列图形中不一定能拼出
平行四边形
矩形
菱形
等腰梯形
在△ABC中借助作图工具可以作出中位线EF沿着中位线EF一刀剪切后用得到的△AEF和四边形EBCF可
如图在Rt△ABC中∠ACB=90°D.E.分别为ABAC边的中点连接DE将△ADE绕点E.旋转18
如图在△ABC中AB=4BC=6DE.DF是△ABC的中位线则四边形BEDF的周长是
5
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如图直角三角形纸片ABC的∠C为90°将三角形纸片沿着图示的中位线DE剪开然后把剪开的两部分重新拼接
直角梯形
矩形
等腰梯形
平行四边形
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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.
改革开放以来我国众多科技实体在各自行业取得了举世瞩目的成就大疆科技华为集团太极股份和凤凰光学等就是其中的杰出代表.上述四个企业的标志是轴对称图形的是
在一段长为1000的笔直道路AB上甲乙两名运动员均从A点出发进行往返跑训练.已知乙比甲先出发30秒钟甲距A点的距离y米与其出发的时间x分钟的函数图象如图所示乙的速度是150米分钟且当乙到达B点后立即按原速返回. 1当x为何值时两人第一次相遇 2当两人第二次相遇时求甲的总路程.
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!
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如图四边形ABCD的对角线相交于点O且点O是BD的中点若AB=AD=5BD=8∠ABD=∠CDB则四边形ABCD的面积为
现有一组数据14324x.若该组数据的中位数是3则x的值为
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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.
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.
15分ChineseresearchershaveplannedtobuildanairportinAntarcticainNovember.TheChinese1benotveryusedtoflyingtothesouthernmostcontinentbecausethecountrysfirstpolarplanetheSnowEagle6012putintouseonlythreeyearsago. BeforetheSnowEagle601Chineseresearcherstraveledtotheice﹣coveredlandbyshipwhichtooksignificantly3longthanflying.Therearecurrentlymorethan20airportsinAntarcticabutnoneofthembelongtoChina.TheSnowEagle601hastorelyonRussianairports4takeoffandland.That's5theChineseresearchersdecidedtobuildtheirown.BuildinganairportinAntarcticaisverydifferentfrombuildingoneelsewhere.Thecontinentiscoveredbya6constantmovinglayeroficesothebuildersmustfindsomewherethatmovesattheslowestpossiblepaceandina7fixdirection. Thebuildersmanagedtofindaspotbackinearly2017following8toughmeasuringprocessthattookplaceinthestorm﹣likepolarwinds.Thenextproblemisthesnow.Thesoftnatureofsnowmakes9abadmaterialforarunway.Sothebuildersmustuseroadroller﹣like10machinetopressthesnowwhichcanbeverytime﹣consuminginextremecoldness.
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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
先化简再求值•﹣其中a=2.
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若关于x的不等式组有解则在其解集中整数的个数不可能是
我们知道很多数学知识相互之间都是有联系的.如图图一是“杨辉三角”数阵其规律是从第三行起每行两端的数都是“1”其余各数都等于该数“两肩”上的数之和图二是二项和的乘方a+bn的展开式按b的升幂排列.经观察图二中某个二项和的乘方的展开式中各项的系数与图一中某行的数一一对应且这种关系可一直对应下去.将s+x15的展开式按x的升幂排列得s+x15=a0+a1x+a2x2+…+a15x15. 依上述规律解决下列问题 1若s=1则a2= 2若s=2则a0+a1+a2+…+a15=.
这样我们就不能在那里生活了.prevent…from .
thoughshewastherewasnohopeofherbeingabletosleep.exhaust
下表是甲乙两名同学近五次数学测试满分均为100分的成绩统计表 根据上表数据成绩较好且比较稳定的同学是.
某同学家买了一个外形非常接近球的西瓜该同学将西瓜均匀切成了8块并将其中一块经抽象后按如图所示的方式放在自已正前方的水果盘中则这块西瓜的三视图是
仔细阅读课文HowLifeBeganOnTheEarth写出文章的段落大意.
我们能否登陆火星完全取决于科学技术的发展.dependon .
如图已知点F是△ABC的重心连接BF并延长交AC于点E连接CF并延长交AB于点D过点F作FG∥BC交AC于点G.设三角形EFG四边形FBCG的面积分别为S1S2则S1S2=.
方程=的解为x=.
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