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(1)如图1,在△ABC中,已知OB,OC分别平分∠ABC,∠ACB,BP,CP分别平分∠ABC,∠ACB的外角∠DBC,∠ECB.①若∠A=50°,则∠O= ,∠P= ;②若∠A=α,则∠...
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如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于点D.且OD=3则△A
如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△AB
已知如图在△ABC中OB和OC分别平分∠ABC和∠ACB过O作DE∥BC分别交AB.AC于点D.E若
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如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△AB
如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△AB
如图所示已知△ABC的周长是18OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=4则△AB
如图已知△ABC的周长是24OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△ABC的
如图已知的周长是21OBOC分别平分∠ABC和∠ACB△ABC的面积是_______.
如图△ABC的周长是12OB.OC分别平分∠ABC和∠ACBOD⊥BC于D且OD=3则△ABC的面积
如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△AB
已知如图O.是△ABC内一点且OBOC分别平分∠ABC∠ACB.1若∠A.=46°求∠BOC2若∠A
如图已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3△ABC的面
如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△AB
已知△ABC中AB=AC点O.在△ABC的内部∠BOC=90°OB=OCD.E.F.G.分别是ABO
如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△AB
如图所示已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=3则△AB
如图已知△ABC的周长是21OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=4△ABC的面
如图已知的周长是21OBOC分别平分∠ABC和∠ACB△ABC的面积是_______.
如图所示已知△ABC的面积是36OBOC分别平分∠ABC和∠ACBOD⊥BC于D.且OD=4则△AB
探索与运用1基本图形如图①已知OC是∠AOB的角平分线DE∥OB分别交OA.OC于点D.E.求证DE
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TimBerners﹣Leeisnotthemostfamousinventorintheworld.Howeverhisinventionhaschangedourlives. HewasborninLondonEnglandin1955.WhenhewasasmallboyTimwasinterestedinplayingwithelectricalthings.HestudiedscienceatOxfordUniversity.Hemadehisfirstcomputerfromanoldtelevisionattheageof21. Timstartedworkingonearlycomputers.Atthattimetheyweremuchbiggerthannow.HeworkedinEnglandthenSwitzerland.Timwasreallyinterestedintwothingscomputersandhowthebrainworks.Howcouldthebrainconnectsomanyfactssoquickly?Hehadtoworkwithpeopleallovertheworld.Theysharedinformationaboutcomputers.Itwashardtomanagealltheinformation.Heansweredthesamequestionsagainandagain.Ittookalotoftime.ItwasevendifficultforcomputersinthesameofficeinSwitzerlandtoshareinformation.Timalsoforgotthingseasily.Couldacomputerworklikeabrain?Couldittalktoothercomputers? TherewasanInternetalreadybutitwasdifficulttouse.In1989TimBerners﹣LeeinventedtheWorldWideWebWWWallbyhimself.ThishadaspeciallanguagethathelpedcomputerstalktoeachotherontheInternet.WhenpeoplewantedtoshareinformationwithotherstheyusedtheWorldWideWeb.TheInternetgrewquicklyafterthat. TimBerners﹣Leedoesn'tthinkhedidanythingspecial.HesaysthatalloftheideasabouttheInternetwerealreadythere.Allhedidwastoputthemtogether.HesaysthatmanyotherpeopleworkedtogethertomaketheInternetwhatitistoday. Mostinventorswanttobecomerich.ButTimgaveawaytheWorldWideWebfornothing.HenowworksinAmerica.HehelpspeoplesharetechnologyandwantstheInternettobefreeforeveryonetouse.Maybeheisthemostimportantbutleastfamousinventorintheworldtoday! 1.WhatwasTimBerners﹣Leeinterestedin? A.Lookingforjobsindifferentcities. B.Talkingtopeoplearoundtheworld. C.Studyinghowtoconnectcomputers. D.Exploringhowtoimprovememory. 2.TheunderlinedwordItinParagraph3refersto. A.Workingonearlycomputers B.Connectingdifferentfactstogether C.TravellingtotheofficeinSwitzerland D.Repeatingtheanswerstothesamequestions 3.WhyisTimBerners﹣Leeoneofthemostimportantmenintheworld? A.HemadeinformationsharingontheInternetpossible. B.Hemadethefirstcomputerwhenhewas21yearsold. C.Hehelpedpeopleunderstandbetterhowthebrainworks. D.HeinventedtheInternetandmadeitfreeforeveryonetouse. 4.Inwhatorderdidthefollowingeventstakeplace? a.TimworkedinEngland.b.TimworkedinSwitzerland. c.Timmadehisfirstcomputer.d.TiminventedtheWorldWideWeb. e.TimstudiedscienceatOxfordUniversity. A.c﹣e﹣d﹣a﹣b B.e﹣b﹣a﹣c﹣d C.c﹣d﹣a﹣e﹣b D.e﹣c﹣a﹣b﹣d 5.WhatdoesthewriterthinkofTimBerners﹣Lee? A.Heisnotfamousbecauseheisnotrich. B.Hehaschangedourlivesandheisgreat. C.Hedidnothingspecialbutmakepeopleagoodlife. D.Hehasmadegreatachievementsinmemoryresearch.
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