中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89

第1課時(shí)三角形的基本知識(shí)第1課時(shí)三角形的基本知識(shí)中考考什么中考考什么1.（2017·北部灣）如圖，ΔABC中，∠A=60°，∠B=40°，則∠C等于（）

A.100°B.80°C.60°D.40°B1.（2017·北部灣）如圖，ΔABC中，∠A=60°，∠BC2.(2017·南寧良慶區(qū)模擬)一根長(zhǎng)竹簽切成四段，分別為3cm，5cm，7cm，9cm.從中任意選取三根首尾依次相接圍成不同的三角形,則圍成的三角形共有（）A.1個(gè)B.2個(gè)C.3個(gè)D.4個(gè)C2.(2017·南寧良慶區(qū)模擬)一根長(zhǎng)竹簽切成四段，分別為A3.(2017·南寧江南區(qū)模擬)如圖，在△ABC中，D，E分別為BC上兩點(diǎn)，且BD＝DE＝EC，則圖中面積相等的三角形有（）A.4對(duì)B.5對(duì)C.6對(duì)D.7對(duì)A3.(2017·南寧江南區(qū)模擬)如圖，在△ABC中，D，EC4.(2017·南寧興寧區(qū)模擬)如圖所示，把一根鐵絲折成圖示形狀后，AB∥DE，則∠BCD等于（）A.∠D+∠BB.∠B-∠DC.180°+∠D-∠BD.180°+∠B-∠DC4.(2017·南寧興寧區(qū)模擬)如圖所示，把一根鐵絲折成圖D5.（2015·北海）三角形三條中線的交點(diǎn)叫做三角形的（）A.內(nèi)心B.外心C.中心D.重心D5.（2015·北海）三角形三條中線的交點(diǎn)叫做三角形的核心考點(diǎn)解讀核心考點(diǎn)解讀

三角形的分類(lèi)考點(diǎn)1三角形的分類(lèi)考點(diǎn)11.三角形的邊與角（1）三角形兩邊的和

第三邊，三角形兩邊的差

第三邊.（2）三角形三個(gè)內(nèi)角的和等于

.（3）在同一個(gè)三角形中，

，小邊對(duì)小角.大于小于大邊對(duì)大角180°考點(diǎn)2

一般三角形的性質(zhì)1.三角形的邊與角大于小于大邊對(duì)大角180°考點(diǎn)2一和大于固定沒(méi)有2.三角形內(nèi)外角關(guān)系（1）三角形的外角等于與它不相鄰的兩個(gè)內(nèi)角的

.（2）三角形的外角

任何一個(gè)和它不相鄰的內(nèi)角.3.三角形的穩(wěn)定性三角形形狀是

的，只要三角形三邊固定，三角形的形狀和大小就確定不變了，三角形的這個(gè)性質(zhì)叫做三角形的穩(wěn)定性.四邊形

穩(wěn)定性.和大于固定沒(méi)有2.三角形內(nèi)外角關(guān)系中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89［溫馨提示］三角形的角平分線、中線、高線是線段.三角形三條中線的交點(diǎn)叫做三角形的重心；三條角平分線的交點(diǎn)叫做三角形的內(nèi)心；三條高的交點(diǎn)叫做三角形的垂心.特別區(qū)分垂直平分線是直線不是線段.［溫馨提示］兩邊中點(diǎn)平行于一半2.三角形的中位線（1）中位線：連接三角形

的線段叫做三角形的中位線.（2）中位線定理：三角形的中位線

第三邊，并且等于第三邊的

.兩邊中點(diǎn)平行于一半2.三角形的中位線中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89怎么考怎么考

三角形的三邊關(guān)系樣題1已知三角形兩邊的長(zhǎng)分別是5和8，則此三角形第三邊的長(zhǎng)可能是下列的（）A.3B.4C.13D.14B焦點(diǎn)1三角形的三邊關(guān)系B焦點(diǎn)1［解析］先根據(jù)三角形的三邊關(guān)系求出x的取值范圍，再求出符合條件的x的值即可.設(shè)此三角形第三邊的長(zhǎng)為x，則8-5＜x＜8+5，即3＜x＜13.只有選項(xiàng)B符合題意.［解析］先根據(jù)三角形的三邊關(guān)系求出x的取值范圍，再求出符合條變式訓(xùn)練1.（2016·河池）下列長(zhǎng)度的三條線段不能組成三角形的是（）

A.5,5,10B.4,5,6C.4,4,4D.3,4,5A變式訓(xùn)練A2.下列長(zhǎng)度的三根小木棒能構(gòu)成三角形的是（）A.2cm，3cm，5cmB.7cm，4cm，2cmC.3cm，4cm，8cmD.3cm，3cm，4cmD2.下列長(zhǎng)度的三根小木棒能構(gòu)成三角形的是（）D3.(2017·南寧興寧區(qū)模擬)在△ABC中，三邊長(zhǎng)分別為a，b，c，且a＞b＞c，若b=8，c=3，則a的取值范圍是（）A.3＜a＜8B.5＜a＜11C.6＜a＜10D.8＜a＜11D3.(2017·南寧興寧區(qū)模擬)在△ABC中，三邊長(zhǎng)分別為a

三角形的角的關(guān)系樣題2如圖，在△ABC中，CD是∠ACB的平分線，∠A=80°，∠ACB=60°，則∠BDC的度數(shù)為

。110°焦點(diǎn)2三角形的角的關(guān)系110°焦點(diǎn)2［解析］本題根據(jù)“三角形的一個(gè)外角等于和它不相鄰的兩個(gè)內(nèi)角的和”可解決.∵CD是∠ACB的平分線，∠ACB=60°，∴∠ACD=30°.∵∠A=80°，∴∠BDC=∠A+∠ACD=110°.［解析］本題根據(jù)“三角形的一個(gè)外角等于和它不相鄰的兩個(gè)內(nèi)角的變式訓(xùn)練4.（2016·百色）三角形的內(nèi)角和等于（）A.90°B.180°C.300°D.360°5.（2016·貴港）在△ABC中，若∠A=95°，∠B=40°，則∠C的度數(shù)為（）A.35°B.40°C.45°D.50°BC變式訓(xùn)練BC6.(2017·南寧西鄉(xiāng)塘區(qū)模擬)如圖，直線a∥b，一塊含60°角的直角三角板ABC（∠A=60°）按如圖所示放置.若∠1=55°，則∠2的度數(shù)為（）A.105°B.110°C.115°D.120°C6.(2017·南寧西鄉(xiāng)塘區(qū)模擬)如圖，直線a∥b，一塊含6

三角形中重要線段的運(yùn)用樣題3如圖，在△ABC中，D，E分別是邊AC，AB的中點(diǎn)，連接BD.若BD平分∠ABC，則下列結(jié)論錯(cuò)誤的是（）A.BC＝2BEB.∠A＝∠EDAC.BC＝2ADD.BD⊥ACC焦點(diǎn)3三角形中重要線段的運(yùn)用C焦點(diǎn)3

［解析］根據(jù)D，E分別是邊AC，AB的中點(diǎn)，得出DE是△ABC的中位線，所以DE∥BC且BC=2DE；又BD平分∠ABC，所以∠CBD=∠DBE=∠BDE，所以BE=DE=AE，所以AB=2DE，所以AB=BC，則BC=2BE，∠A=∠C=∠EDA，BD⊥AC.［解析］根據(jù)D，E分別是邊AC，AB的中點(diǎn)，得出DE變式訓(xùn)練7.(2017·南寧邕寧區(qū)模擬)如圖，AD是△ABC中∠BAC的角平分線，DE⊥AB于點(diǎn)E，S△ABC=7，DE=2，AB=4，則AC長(zhǎng)是（）

A.3B.4C.6D.5A變式訓(xùn)練A8.（2016·5來(lái)賓）如圖，在△ABC中，AB=4，BC=6，DE、DF是△ABC的中位線，則四邊形BEDF的周長(zhǎng)是（）A.5B.7C.8D.10D8.（2016·5來(lái)賓）如圖，在△ABC中，AB=4，BC=9.如圖，在Rt△ABC中，∠B=90°，∠A=40°，AC的垂直平分線MN與AB相交于D點(diǎn)，則∠BCD的度數(shù)是

.10°9.如圖，在Rt△ABC中，∠B=90°，∠A=40°，AC補(bǔ)充練習(xí)補(bǔ)充練習(xí)中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89

一、完形填空(共15小題；每小題1分，滿分15分)閱讀下面短文，掌握其大意，然后從每題所給的A、B、C、D四個(gè)選項(xiàng)中選出最佳選項(xiàng)。Lifeisfulloftheunexpected.__1__acoldwinterafternoon，amansawanoldladystandingbyherexpensivecarandclearlysheneededhelp.Sohestoppedand__2__hisoldtruck.“Ishegoingtohurtme?Hedoesn'tlooksafe，”theoldladywas__3__．(B)1.A.InB．OnC．AtD．Under(D)2.A.wentoffB．turnedoffC．tookoffD．gotoff(C)3.A.gladB．excitedC．worriedD．surprised

(B)1.A.InB．OnC．AtD．UnThemancouldseethatshewasafraid，sohesaidinhisfriendliest__4__，“I'mheretohelpyou，madam.Whydon'tyou__5__inthecarwhereit'swarm？__6__，mynameisTedJohnson.”Tedquicklyfixedthecarandtheladythankedhim.Thensheasked__7__sheshouldpayhim.(A)4.A.voiceB．soundC．noiseD．look(A)5.A.waitB．towaitC．waitedD．waits(D)6.A.InawayB．OnmywayC．UnderthewayD．Bytheway(B)7.A.howmanyB．howmuchC．howfarD．howoftenThemancouldseethatsheButTedwanted__8__money.Hewasjustgivingahandtosomeoneintrouble.__9__wasnormalforhimtodosuchathinglikethat.Hesaid，“Ifyoureallywanttorepay(報(bào)答)me，nexttimeyouseesomeoneinneed，thinkofmeandhelpthem.”(B)8.A.notB．noC．someD．a(chǎn)ny(C)9.A.ThisB．ThatC．ItD．TheyButTedwanted__8__money.HAftersayinggoodbye，theladycontinueddowntheroaduntilshereachedasmall__10__whereshedecidedtostopforsomethingtoeat.Astheprettywaitresstookherorder，theladynoticedshewas__11__eightmonthspregnant(懷孕)．Thewaitresslookedtiredandweak，__12__shewasverykind.Astheladywasgoingtopaythe$10bill，sherememberedTed'swords.(A)10.A.restaurantB．bookstoreC．cinemaD．library(C)11.A.mostlyB．hardlyC．nearlyD．seldom(B)12.A.soB．butC．orD．thoughAftersayinggoodbye，thelaAftertheladywasgone，thewaitresssawasmallnoteonthetable.Itsaid，“SomebodyoncehelpedmethewayI'mhelpingyou.Continuebeingkindtootherpeople.”Underthenotewerefive__13__dollars.Thewaitresswas__14__excitedthatshecalledherhusbandtotellhimthenews，“Ted…TedJohnsonmydear…you'renotgoingtobelieve__15__justhappened…”(A)13.A.hundredB．hundredsC．hundredofD．hundredsof(D)14.A.tooB．veryC．suchD．so(C)15.A.howB．whenC．whatD．whyAftertheladywasgone，the二、閱讀理解(共15小題；每小題2分，滿分30分)閱讀下面四篇短文，從每題所給的A、B、C、D四個(gè)選項(xiàng)中選出最佳選項(xiàng)。A(2017廣東中考改編)二、閱讀理解(共15小題；每小題2分，滿分30分)中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89(C)16.TheWorldPoetryDayison________．A．August28thB．March3rdC．March21stD．August28th(D)17.ThepurposeoftheWorldPoetryDayis________．A．toencouragetheBritishtowritepoemsB．toteachchildrenhowtoreadandwritepoemsC．toraisemoneyforthepoetsfromallovertheworldD．tohelppeopletoread，writeandteachpoemsbetter(C)16.TheWorldPoetryDayi(A)18.TherulesforthecompetitionincludethefollowingEXCEPT________．A．thatpoetscanwritepoemsinanylanguageB．thatpoetsmustusetheirunpublishedpoemsC．thatpoemscan'tbewrittenonthesubjectofviolenceordrugsD．thatpoemscan'tbetakenbackafterthecompetition(A)18.TherulesforthecompBSportscanhelpyoukeepfitandclosetonature.However，whetheryouareonthemountains，inthewaves，oronthegrassland，youshouldrealizethatsportyouchoosemighthavegreatinfluenceontheenvironment.BSomesportsareresource-hungry．Golf，asyoumayknow，eatsupnotonlylargeareasofcountryside，butalsolotsofwater.Besides，hugeamountsofenergyareusedtokeepitscourses(球場(chǎng))ingoodcondition.Thiscausesmajorenvironmentalchanges.Forexample，inthedryplacesofPortugalandSpain，golfisoftenheldresponsiblefor(為……承擔(dān)責(zé)任)seriouswatershortage(短缺)insomelocalareas.Somesportsareresource-huTherearemanyenvironment-friendlysports.Powerwalkingisoneofthemthatyoucouldtakeuptoday.Youdon'tneedanyspecialequipmentexceptagoodpairofshoes，andyoudon'thavetoworryaboutresourcesandyourpurse.Simpleandfree，powerwalkingcanalsohelpyoustayhealthy.Ifyouwalkregularly，itwillbegoodforyourheart.Expertssaythat20minutesofpowerwalkingdailycanmakeyoufeellessanxious，sleepwellandkeepthin.Therearemanyenvironment-Whateversportyoutakeup，youcanmakeitgreenerthanbyusingenvironment-friendlyequipmentandbuyingproductsmadefromrecycledmaterials.Butthefinalgoalshouldbe“greengyms”．Theyarebetterreplacements(替代)fortraditionalhealthclubsandmodernsportscenters.Membersofgreengymsplaysportsoutdoors，inthecountrysideorotheropenspaces.Thereisnospecialrequirementforyoutostartyourmembership(會(huì)員身份)．Andbestofall，it'sfree.Whateversportyoutakeup，(A)19.Whichoffollowingdoestheauthormostprobablysupportaccordingtothepassage?A．Bicyclingaroundthelake.B．Carracingontheroad.C．Playingbasketballinagym.D．Swimminginasportscentre.(D)20.Whatdoestheunderlinedphrase“resource-hungry”inthispassagemeaninChinese?A．廣為流行的B．親近自然的C．低成本的D．耗費(fèi)資源的(A)19.Whichoffollowingdoe(C)21.Theauthorusespowerwalkingasanexamplemainlybecause________．A．itisanoutdoorsportB．itislovedbymanypeopleC．itusesfewerrecoursesD．itissupportedbyexperts(B)22.Theauthorwritesthepassageto________．A．showusdisadvantagesofgolfB．urgeustotakepartingreensportsC．explainthemajorsportsinfluenceofpopularsportsD．discussdifferentkindsofenvironment-friendlysport(C)21.TheauthorusespowerCLaoShewroteTeahousein1957.TheplayshowstheaudiencelifeinChinabetween1898and1945.IttakesplaceinateahouseinoldBeijingandittellsusthestoryofWangLifaandhiscustomers.Itasksustoseetheteahouseasthecentreoftheneighbourhood.Finally，itsaysgoodbyetooldBeijinganditspeople.CThestorystartsin1898duringtheQingDynasty.Itcontinuesin1916，andfinally，itbringstheaudiencetotheendoftheAnti-JapaneseWarin1945.Afterthewar，Wanglosestheteahouseandhedies.LaoShewasborninBeijingin1899.HisparentssenthimtotheTeacher'sSchoolinBeijingandhelearnedtoteach.From1924to1929hetaughtChinesetotheEnglishinLondon.Hewrotemanyplays，novelsandshortstories.Hewasnameda“People'sArtist”anda“GreatMasterofLanguage”．HewasoneofthegreatestChinesewritersofthe20thcentury.Thestorystartsin1898duInLaoShe'sTeahousetoday，waitersbringteatothecustomersandsellthemdeliciousChinesefood.IfyoulikeBeijingOpera，folkmusic，acrobaticsormagicshows，youcanenjoythemintheteahouse.LaoShe'sTeahousegivesawonderfulwelcometoeveryonefromChinaandfromallovertheworld.InLaoShe'sTeahousetoday(B)23.What'sthemainideaofParagraph4?A．LaoShe.B．LaoShe'sTeahouse.C．ThestoryofTeahouse.D．TheplayTeahouse.(D)24.HowmanyyearsoflifeinChinaisshownintheplayTeahouse?A．57years.B．45years.C．98years.D．47years.(B)23.What'sthemainideao(A)25.LaoShewasallofthefollowingexcept________．A．a(chǎn)bossofTeahouseB．a(chǎn)People'sArtistC．a(chǎn)GreatMasterofLanguageD．oneofthegreatestChinesewritersofthe20thcentury(C)26.WhowerewelcometoLaoShe'sTeahousetoday?A．OnlyChinesecustomers.B．Onlyforeigncustomers.C．Everycustomerfromhomeandabroad.D．OnlyBeijingOperaaudience.(A)25.LaoShewasalloftheDSpecialBridgesHelpAnimalsCrosstheRoad

ReportedbySheilaCarrickWhydidthechickencrosstheroad?Togettotheotherside.Mostpeopleknowthisjoke.Butrecently，somepeoplehavebeenmuchmoreworriedabouthowthegrizzlybear(灰熊)andmountainlioncancrosstheroad.D“MillionsofanimalsdieeachyearonUSroads，”theFederalHighwayAdministrationreports.Infact，onlyabout80ocelots，anendangeredwildcat，existintheUStoday.Themainreason?Roadkill.“Ecopassages(生態(tài)通道)”mayhelpanimalscrosstheroadwithoutbeinghitbycars.Theyarepathsbothoverandunderroads.“Theseecopassagescanbeextremelyuseful，sothatwildlifecanavoidroadaccidents，”saidJodiHiltyoftheWildlifeProtectionSociety.“MillionsofanimalsdieeaButdoanimalsactuallyusetheecopassages?Theanswerisyes.PaulBeierofNorthernArizonaUniversityfoundfootmarksleftbymountainlionsonanecopassagethatwentunderahighway.Thisshowedthatthelionsusedthepassage.Buildersofecopassagestrytomakethemlooklikeanaturalpartofanareabyplantingtreesonandaroundthem.Animalsseemtobecatchingon.Animalsasdifferentassalamanders(火蜥蜴)andgrizzlybearsareusingthebridgesandunderpasses.Thenexttimeyouvisitaparkordrivethroughanareawithalotofwildlife，lookaround.Youmightseeananimaloverpass!Butdoanimalsactuallyuse(D)27.Thewriterusestheexampleof“ocelots”toshowthat________．A．wildanimalshavebecomemoredangerousB．thedrivingconditionshaveimprovedgreatlyC．themeasureforprotectingwildlifefailstoworkD．a(chǎn)nincreasingnumberofanimalsarekilledinroadaccidents(D)27.Thewriterusestheex(D)28.Fromthepassage，weknowanecopassageis________．A．a(chǎn)nundergroundpathforcarsB．a(chǎn)fencebuiltforthesafetyoftheareaC．a(chǎn)bridgeforanimalstogetoverariverD．a(chǎn)pathforanimalstocrosstheroad(D)28.Fromthepassage，wekn(B)29.Whenthewritersaysthat“Animalsseemtobecatchingon”，hemeans________．A．a(chǎn)nimalsbegintorealizethedangersontheroadB．a(chǎn)nimalsbegintolearntouseecopassagesC．a(chǎn)nimalsarecrossingtheroadingroupsD．a(chǎn)nimalsareincreasinginnumber(B)29.Whenthewritersayst(D)30.Thewriterasksvisitorsanddriverstolookaroundwhentravellingbecause________．A．wildanimalsmayattackcarsB．wildanimalsmayjamtheroadC．theymayseewildanimalsintheparkD．theymayseewildanimalsonecopassages(D)30.Thewriterasksvisito三、詞匯運(yùn)用(共15小題；每小題1分，滿分15分)A．用方框中所給詞語(yǔ)的適當(dāng)形式填空。每詞限用一次。31．MrLihasmadea__decision__totraveltoBeijing.32．Theschool__provides__thestudentswithdeliciousfoodeveryday.33．Hejustsat__in__silence__anddidn'tsayanywords.34．Ihavebeentoseveral__European__countries，suchasEnglandandFrance.35．Youcan'tgo__across__thestreetwhenthetrafficlightsturnred.三、詞匯運(yùn)用(共15小題；每小題1分，滿分15分)B．根據(jù)短文內(nèi)容和所給中文提示，在空白處寫(xiě)出單詞的正確形式。每空限填一詞。Itis8：30amattheChengduResearchBase.LinWei，apandakeepers，ispreparingthemilkforthebabypandas'36.__breakfast__(早餐)．At9：00am，shefindsthatmostofthebabiesarealready37.__awake__(醒著的)andhungry.Whenthebabiesseethekeepers，theyrunoverwithexcitement，andsomeofthemeven38.__walk__(行走)intotheirfriendsandfallover!They'resocuteandlovely.LinWeitakescareofthemlikethey'reher39.__own__(自己的)babies.Shewashes，feedsandplayswiththemeveryday.B．根據(jù)短文內(nèi)容和所給中文提示，在空白處寫(xiě)出單詞的正確形式。Pandasdonothavemanybabies，maybeonlyoneeverytwoyears.Thebabiesoften40.__die__(死亡)fromillnessesanddonotliveverylong.Adultpandasspendmorethan12hoursadayeatingabout10kilosofbamboo.Manyyearsago，therewerealotmorebambooforestsandpandasinChina.Butnowpandasareingreat41.__danger__(危險(xiǎn))．Peoplecutdownmanybambootreessotheyarelosingtheirhomes.Thereareabout1，59042.__wild__(野生的)pandaslivingintheforestsinSichuan，ShaanxiandGansuprovinces.Another200orsoliveinzoosorresearchcentresinChinaandothercountries.PandasdonothavemanybabIt'sa43.__pity__(遺憾)thatmanypeopledon'tknowthat.SothegovernmenthassetupaneducationprogrammeinChengdu.Itteacheschildrenincitiesaboutpandas，andtellsthemaboutthe44.__importance__(重要性)ofsavingthepandas.Butteachingchildrenisonewaytohelp45.__protect__(保護(hù))environmentandsavepandas.TheChinesegovernmentisalsoplantingmorebambootreessotherewillbemoreforestsforpandastolivein.Weallhopethatinthefuturetherewillbealotmorepandasthannow.It'sa43.__pity__(遺憾)that四、語(yǔ)法填空(共10小題；每小題1分，滿分10分)閱讀下面短文，在空白處填入一個(gè)適當(dāng)?shù)脑~，或填入括號(hào)中所給單詞的正確形式。Somepeoplestillliveintheirhometown.However，othersmayonlyvisit46.__it__onceortwiceayear.MillionsofChineseleavethecountryside47.__to__search__(search)forworkinthecities.AmongtheseisHuaXing.He48.__has__lived__(live)inWenzhouforthelast13years.Withahardjob49.__in__afactory，heseldomvisitshishometown.“Ihaven'tbeenback50.__for__threeyears.It's

ashame，”hesays.四、語(yǔ)法填空(共10小題；每小題1分，滿分10分)51．__Developments__(develop)havebeengoodinHuaXing'shometownsince2002，forexample，newroads52.__have__appeared__(appear)．Anewschool53.__has__been__built__(build)．However，somethingswillneverchangeinhishometown.Thebigoldtreeisstillbesidetheplayground.Childreninhistime54.__usually__(usual)likedtoplaytogetherunderit.Itwas55.__such__happychildhood.51．__Developments__(develo五、(2017邵陽(yáng)中考)任務(wù)型閱讀(共5小題；每小題1分，滿分5分)

閱讀下列短文，在空白處(56—60)填入與短文內(nèi)容相符的信息，完成閱讀摘記。MaciekCzastkawasborninLodz，Poland.HecametoChinaseveralyearsago.Sofar，hehasbeenworkinginChengduforthreeyears.五、(2017邵陽(yáng)中考)任務(wù)型閱讀(共5小題；每小題1分，“TheBeltandRoadInitiative(一帶一路的倡議)ismeaningful，”hesaid.“Thankstoit，weareofferedmorechances.”ThemostpowerfulsupportforChengdutothrive(興盛)alongtheBeltandRoadistheChengdu-Europeexpressrailway(高速鐵路)．ItprovidesdirecttrainservicesbetweenChengduandthecityofLodz.Becauseoftheexpressrailway，trainscanbringthingsfromChinatoEurope.Atthesametime，theycanbringbackEuropeanfood，wine，meatandsoon.In2016，atotalof460trainsranbetweenChengduandEurope.Thenumberisexpectedtogrowto1，000thisyear.“TheBeltandRoadInitiatiSincetheChengdu-Lodzexpressrailwaywasopened.Chengdu，togetherwithothercitiesinwestChina，hasdevelopedclosetradetieswiththeEuropeancountry.PolandisoneofthelargestappleproducersinEurope.Czastka'scompanyhelpsfarmersinPolandselltheirapplestoChina.MoreandmoreEuropeanproductswillbesenttoChinainthefuture.SincetheChengdu-Lodzexpr中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89六、書(shū)面表達(dá)(共1小題；滿分25分)請(qǐng)你以“WhatShouldWeDoinEnglishClass？”為題寫(xiě)一篇英語(yǔ)短文，談?wù)勗谟⒄Z(yǔ)課堂上學(xué)生應(yīng)該怎樣做，才能使英語(yǔ)學(xué)習(xí)更有效。提示：1.Listentotheteacher；2．Takepartinactivities；3．Beconfidentinourselves.要求：1.文稿須包括所有提示內(nèi)容，可適當(dāng)發(fā)揮；2．文稿中不得出現(xiàn)真實(shí)人名、校名和地名；3．詞數(shù)：60～80個(gè)。參考詞匯：takenotes，workingroupswith…，notbeafraidof…六、書(shū)面表達(dá)(共1小題；滿分25分)WhatShouldWeDoinEnglishClass?InEnglishclass，weshould__listen__to__the__teacher__carefully__and__take__notes__when__necessary.Try__to__answer__questions__in__English.We__should__take__part__in__all__kinds__of__activities__like__reading，writing，having__discussions__and__playing__games.We__need__to__work__in__group__with__our__classmates__to__help__each__other__and__learn__from__each__other.__It's__very__important__to__be__confident.Speak__English__loudly__in__front__of__the__class__and__never__be__afraid__of__making__mistakes.In__this__way，we__can__make__much__progress.__

WhatShouldWeDoinEnglishC第1課時(shí)三角形的基本知識(shí)第1課時(shí)三角形的基本知識(shí)中考考什么中考考什么1.（2017·北部灣）如圖，ΔABC中，∠A=60°，∠B=40°，則∠C等于（）

A.100°B.80°C.60°D.40°B1.（2017·北部灣）如圖，ΔABC中，∠A=60°，∠BC2.(2017·南寧良慶區(qū)模擬)一根長(zhǎng)竹簽切成四段，分別為3cm，5cm，7cm，9cm.從中任意選取三根首尾依次相接圍成不同的三角形,則圍成的三角形共有（）A.1個(gè)B.2個(gè)C.3個(gè)D.4個(gè)C2.(2017·南寧良慶區(qū)模擬)一根長(zhǎng)竹簽切成四段，分別為A3.(2017·南寧江南區(qū)模擬)如圖，在△ABC中，D，E分別為BC上兩點(diǎn)，且BD＝DE＝EC，則圖中面積相等的三角形有（）A.4對(duì)B.5對(duì)C.6對(duì)D.7對(duì)A3.(2017·南寧江南區(qū)模擬)如圖，在△ABC中，D，EC4.(2017·南寧興寧區(qū)模擬)如圖所示，把一根鐵絲折成圖示形狀后，AB∥DE，則∠BCD等于（）A.∠D+∠BB.∠B-∠DC.180°+∠D-∠BD.180°+∠B-∠DC4.(2017·南寧興寧區(qū)模擬)如圖所示，把一根鐵絲折成圖D5.（2015·北海）三角形三條中線的交點(diǎn)叫做三角形的（）A.內(nèi)心B.外心C.中心D.重心D5.（2015·北海）三角形三條中線的交點(diǎn)叫做三角形的核心考點(diǎn)解讀核心考點(diǎn)解讀

三角形的分類(lèi)考點(diǎn)1三角形的分類(lèi)考點(diǎn)11.三角形的邊與角（1）三角形兩邊的和

第三邊，三角形兩邊的差

第三邊.（2）三角形三個(gè)內(nèi)角的和等于

.（3）在同一個(gè)三角形中，

，小邊對(duì)小角.大于小于大邊對(duì)大角180°考點(diǎn)2

一般三角形的性質(zhì)1.三角形的邊與角大于小于大邊對(duì)大角180°考點(diǎn)2一和大于固定沒(méi)有2.三角形內(nèi)外角關(guān)系（1）三角形的外角等于與它不相鄰的兩個(gè)內(nèi)角的

.（2）三角形的外角

任何一個(gè)和它不相鄰的內(nèi)角.3.三角形的穩(wěn)定性三角形形狀是

的，只要三角形三邊固定，三角形的形狀和大小就確定不變了，三角形的這個(gè)性質(zhì)叫做三角形的穩(wěn)定性.四邊形

穩(wěn)定性.和大于固定沒(méi)有2.三角形內(nèi)外角關(guān)系中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89［溫馨提示］三角形的角平分線、中線、高線是線段.三角形三條中線的交點(diǎn)叫做三角形的重心；三條角平分線的交點(diǎn)叫做三角形的內(nèi)心；三條高的交點(diǎn)叫做三角形的垂心.特別區(qū)分垂直平分線是直線不是線段.［溫馨提示］兩邊中點(diǎn)平行于一半2.三角形的中位線（1）中位線：連接三角形

的線段叫做三角形的中位線.（2）中位線定理：三角形的中位線

第三邊，并且等于第三邊的

.兩邊中點(diǎn)平行于一半2.三角形的中位線中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89怎么考怎么考

三角形的三邊關(guān)系樣題1已知三角形兩邊的長(zhǎng)分別是5和8，則此三角形第三邊的長(zhǎng)可能是下列的（）A.3B.4C.13D.14B焦點(diǎn)1三角形的三邊關(guān)系B焦點(diǎn)1［解析］先根據(jù)三角形的三邊關(guān)系求出x的取值范圍，再求出符合條件的x的值即可.設(shè)此三角形第三邊的長(zhǎng)為x，則8-5＜x＜8+5，即3＜x＜13.只有選項(xiàng)B符合題意.［解析］先根據(jù)三角形的三邊關(guān)系求出x的取值范圍，再求出符合條變式訓(xùn)練1.（2016·河池）下列長(zhǎng)度的三條線段不能組成三角形的是（）

A.5,5,10B.4,5,6C.4,4,4D.3,4,5A變式訓(xùn)練A2.下列長(zhǎng)度的三根小木棒能構(gòu)成三角形的是（）A.2cm，3cm，5cmB.7cm，4cm，2cmC.3cm，4cm，8cmD.3cm，3cm，4cmD2.下列長(zhǎng)度的三根小木棒能構(gòu)成三角形的是（）D3.(2017·南寧興寧區(qū)模擬)在△ABC中，三邊長(zhǎng)分別為a，b，c，且a＞b＞c，若b=8，c=3，則a的取值范圍是（）A.3＜a＜8B.5＜a＜11C.6＜a＜10D.8＜a＜11D3.(2017·南寧興寧區(qū)模擬)在△ABC中，三邊長(zhǎng)分別為a

三角形的角的關(guān)系樣題2如圖，在△ABC中，CD是∠ACB的平分線，∠A=80°，∠ACB=60°，則∠BDC的度數(shù)為

。110°焦點(diǎn)2三角形的角的關(guān)系110°焦點(diǎn)2［解析］本題根據(jù)“三角形的一個(gè)外角等于和它不相鄰的兩個(gè)內(nèi)角的和”可解決.∵CD是∠ACB的平分線，∠ACB=60°，∴∠ACD=30°.∵∠A=80°，∴∠BDC=∠A+∠ACD=110°.［解析］本題根據(jù)“三角形的一個(gè)外角等于和它不相鄰的兩個(gè)內(nèi)角的變式訓(xùn)練4.（2016·百色）三角形的內(nèi)角和等于（）A.90°B.180°C.300°D.360°5.（2016·貴港）在△ABC中，若∠A=95°，∠B=40°，則∠C的度數(shù)為（）A.35°B.40°C.45°D.50°BC變式訓(xùn)練BC6.(2017·南寧西鄉(xiāng)塘區(qū)模擬)如圖，直線a∥b，一塊含60°角的直角三角板ABC（∠A=60°）按如圖所示放置.若∠1=55°，則∠2的度數(shù)為（）A.105°B.110°C.115°D.120°C6.(2017·南寧西鄉(xiāng)塘區(qū)模擬)如圖，直線a∥b，一塊含6

三角形中重要線段的運(yùn)用樣題3如圖，在△ABC中，D，E分別是邊AC，AB的中點(diǎn)，連接BD.若BD平分∠ABC，則下列結(jié)論錯(cuò)誤的是（）A.BC＝2BEB.∠A＝∠EDAC.BC＝2ADD.BD⊥ACC焦點(diǎn)3三角形中重要線段的運(yùn)用C焦點(diǎn)3

［解析］根據(jù)D，E分別是邊AC，AB的中點(diǎn)，得出DE是△ABC的中位線，所以DE∥BC且BC=2DE；又BD平分∠ABC，所以∠CBD=∠DBE=∠BDE，所以BE=DE=AE，所以AB=2DE，所以AB=BC，則BC=2BE，∠A=∠C=∠EDA，BD⊥AC.［解析］根據(jù)D，E分別是邊AC，AB的中點(diǎn)，得出DE變式訓(xùn)練7.(2017·南寧邕寧區(qū)模擬)如圖，AD是△ABC中∠BAC的角平分線，DE⊥AB于點(diǎn)E，S△ABC=7，DE=2，AB=4，則AC長(zhǎng)是（）

A.3B.4C.6D.5A變式訓(xùn)練A8.（2016·5來(lái)賓）如圖，在△ABC中，AB=4，BC=6，DE、DF是△ABC的中位線，則四邊形BEDF的周長(zhǎng)是（）A.5B.7C.8D.10D8.（2016·5來(lái)賓）如圖，在△ABC中，AB=4，BC=9.如圖，在Rt△ABC中，∠B=90°，∠A=40°，AC的垂直平分線MN與AB相交于D點(diǎn)，則∠BCD的度數(shù)是

.10°9.如圖，在Rt△ABC中，∠B=90°，∠A=40°，AC補(bǔ)充練習(xí)補(bǔ)充練習(xí)中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89中考數(shù)學(xué)基礎(chǔ)過(guò)關(guān)復(fù)習(xí)第五章三角形第1課時(shí)三角形的基本知識(shí)課件89

一、完形填空(共15小題；每小題1分，滿分15分)閱讀下面短文，掌握其大意，然后從每題所給的A、B、C、D四個(gè)選項(xiàng)中選出最佳選項(xiàng)。Lifeisfulloftheunexpected.__1__acoldwinterafternoon，amansawanoldladystandingbyherexpensivecarandclearlysheneededhelp.Sohestoppedand__2__hisoldtruck.“Ishegoingtohurtme?Hedoesn'tlooksafe，”theoldladywas__3__．(B)1.A.InB．OnC．AtD．Under(D)2.A.wentoffB．turnedoffC．tookoffD．gotoff(C)3.A.gladB．excitedC．worriedD．surprised

(B)1.A.InB．OnC．AtD．UnThemancouldseethatshewasafraid，sohesaidinhisfriendliest__4__，“I'mheretohelpyou，madam.Whydon'tyou__5__inthecarwhereit'swarm？__6__，mynameisTedJohnson.”Tedquicklyfixedthecarandtheladythankedhim.Thensheasked__7__sheshouldpayhim.(A)4.A.voiceB．soundC．noiseD．look(A)5.A.waitB．towaitC．waitedD．waits(D)6.A.InawayB．OnmywayC．UnderthewayD．Bytheway(B)7.A.howmanyB．howmuchC．howfarD．howoftenThemancouldseethatsheButTedwanted__8__money.Hewasjustgivingahandtosomeoneintrouble.__9__wasnormalforhimtodosuchathinglikethat.Hesaid，“Ifyoureallywanttorepay(報(bào)答)me，nexttimeyouseesomeoneinneed，thinkofmeandhelpthem.”(B)8.A.notB．noC．someD．a(chǎn)ny(C)9.A.ThisB．ThatC．ItD．TheyButTedwanted__8__money.HAftersayinggoodbye，theladycontinueddowntheroaduntilshereachedasmall__10__whereshedecidedtostopforsomethingtoeat.Astheprettywaitresstookherorder，theladynoticedshewas__11__eightmonthspregnant(懷孕)．Thewaitresslookedtiredandweak，__12__shewasverykind.Astheladywasgoingtopaythe$10bill，sherememberedTed'swords.(A)10.A.restaurantB．bookstoreC．cinemaD．library(C)11.A.mostlyB．hardlyC．nearlyD．seldom(B)12.A.soB．butC．orD．thoughAftersayinggoodbye，thelaAftertheladywasgone，thewaitresssawasmallnoteonthetable.Itsaid，“SomebodyoncehelpedmethewayI'mhelpingyou.Continuebeingkind