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如图,△ABC中,AB=AC,AD⊥BC于点D,DE⊥AC于点E,CF⊥AB于点F.(1)求证:△BCF∽△CDE;(2)若DE=3,求CF的长.
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如图在△ABC中∠C=90°AC=BCAD平分∠BAC交BC于点D.DE⊥AB于点E.若△BDE的周
如图△ABC中DE∥BCDE分别交边ABAC于D.E.两点若AD∶AB=1∶3则△ADE与△ABC的
如图在△ABC中D.是BC边上的中点且AD=ACDE⊥BCDE与AB相交于点E.EC与AD相交于点F
在Rt△ABC中∠BAC=90°过点B.的直线MN∥ACD.为BC边上一点连接AD作DE⊥AD交MN
如图在△ABC中D.是BC的中点DE⊥AB于E.DF⊥AC于点F.且BE=CF.求证AD平分∠BAC
如图在△ABC中D.是BC的中点且AD=ACDE⊥BCDE与AB相交于点E.EC与AD相交于点F.1
探究如图1在Rt△ABC中∠BAC=90°∠ABC=45°过点B的直线MN∥ACD为BC边上一点连接
如图△ABC中AB=AC∠BAC=120°AD⊥AC交BC于点D求证BC=3AD.
如图△ABC中AB=AC=12BC=8AD平分∠BAC交BC于点D.点E.为AC的中点连接DE则△C
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如图在△ABC中∠C.=90°AC=BCAD平分∠BAC交BC于点D.DE⊥AB于点E.若△BDE的
如图在△ABC中AB=AC=10BC=8AD平分∠BAC交BC于D.点E.为AC中点连结DE则△CD
如图△ABC中AB=AC=6BC=8AD平分∠BAC交BC于点D.点E.为AC的中点连结DE则△CD
在△ABC中点D.E分别在边AB.AC上联结DE那么下列条件中不能判断△ADE和△ABC相似的是
DE∥BC
∠AED=∠B
AE:AD=AB:AC
AE:DE=AC:BC
已知如图△ABC中AD⊥BC于D.E.是AD上一点BE的延长线交AC于F.若BD=ADDE=DC求证
如图在△ABC中点D.E分别在ABAC边上DE∥BC若AD=8BD=2DE=6则BC的长为.
如图9-42已知在△ABC中D是BC的中点且AD=ACDE⊥BC交AB于点E.EC与AD相交于点F.
如图△ABC中AB=AC=12BC=8AD平分∠BAC交BC于点D.点E.为AC的中点连接DE则△C
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12
16
13
如图△ABC中AB=AC=10BC=8AD平分∠BAC交BC于点D.点E.为AC的中点连接DE则△C
20
12
14
13
如图在△ABC中DE∥BC分别交ABAC于点D.E.若AD=3DB=2BC=6则DE的长为.
已知如图在△ABC中D.是BC边上的中点且AD=ACDE⊥BCDE与AB相交于点E.EC与AD相交于
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8分AsAmyHagadornroundedthecorneracrossthehallfromherclassroomshemetwithatallboyfromthefifthgraderunningintheoppositedirection. Watchitdwarf矮子theboyshoutedashekeptawayfromthelittlethirdgrader.Thentheboyimitated模仿thewayAmylimped跛行whenshewalked. Amyclosedhereyesforamoment. Ignore忽视him!shetoldherselfassheheadedforherclassroom. Itwasn'tasifheweretheonlyone.ItseemedthateversinceAmystartedthethirdgradesomeoneteasedhereverysingleday.TheteasingmadeAmyfeellonely. BackhomeatthedinnertablethateveningAmywasquiet.Hermotherknewthatthingswerenotgoingwellatschool.That'swhyshewashappytohavesomeexcitingnewstosharewithherdaughter. There'saChristmasWishCompetitiononthenewspapershesaid.WritealettertoSantaClausandyoumightwinaprize. OutcamethepencilandpaperandAmywenttoworkonherletter.Shewrote: DearSantaClaus MynameisAmy.Iam9yearsold.Ihaveaproblematschool.CanyouhelpmeSanta?KidslaughatmebecauseoftheuayItalkandrunandtalk.Ihavecerebralpalsy大脑性瘫痪.Ijustwantonedaywherenoonelaughsatme. Love Amy ThenextdayapictureofAmyandherlettertoSantaClausmadethefrontpageoftheNewsSentinel.Thelittlegirl'sstoryspread.SheaskedforsuchasimpleyetunusualChristmasgift﹣justonedaywithouttenning. ManypeoplethankedAmyforbeingtbraveenoughtospeakup.Othersencouragedhertoignoreteamingandtoearryherheadhigh. Amydidgetherwishofaspecialdnywithouttenning.Tenchernandstudentstalledtogetherabouthowbadtensingcanmakeothersfeel. 1.Theunderlinedwordteasedmeans. A.arguedwith B.talkedabout C.caredfor D.madefunof 2.Amy'smothersharedthenewsofaChristmasWishCompetitionthatdaybecausesheknew. A.Amy'sschoollifewasnotgood B.herdaughterwasteasedbyafifthgrader C.thecompetitionwouldchangeAmy'slife D.Amy'ssicknesswentmuchworsethanbefore 3.Wecaninfer推断fromtheunderlinedsentenceBackhomeatthedinnertablethatevening.AmywasquietthatAmywas.A.nervousB.sadC.happyD.moved
8分Manyofusdon'tpaymuchattentiontotheimportanceofeyecare.Itissaidthatifyoutakecareofyourbodythenyoucansurelybehealthy.Thatiswhyoureyesshouldbegivenalotofcare.Naturaleyecareshouldbeputinanumberoneplace. Thereareseveralcausesleadingtopooreyesightlikenotenoughfoodgenes基因andaging老化.Televisionscomputersandreadingarealsothecausesofhavingpooreyesight.Ifyouworkinfrontofthecomputeritisbesttotakeabreakeveryonceinawhile.Somethingdirtycancauserednessandtheywillmakeyoufeeluncomfortable.Itisbadforyoureyestoo.Ifthishappensthebestwayistocleanyoureyesbyusingcoldwater. Alsoit'simportantthatyoumusttryyourbesttoprotectyoureyesfromharmfulthings.Forexamplesunglassesarenotjustforfashionbuttheycanalsoserveasagreatwaytoprotectyoureyesightfromultravioletrays紫外线. Eatinghealthyfoodswilldogoodtoyoureyesight.RememberthatvitaminsACandEaregoodforeyes.Trytoeatfoodgroupsthathavethesevitamins.Andyoushoulddoeyeexercisesbecauseexerciseprotectsyoureyesighttoo.Ifapersonexercisesregularly定期地andeatstherightkindoffoodhiseyeswillstayingoodconditionforalongtime. Allabovearenaturalwaysofeyecarethathelpuskeephealthyeyes.Beinghappyallthetimecanbehelpfultoaperson'seyesighttoo.Inawordeyecareisveryimportantnomatterhowoldapersonis. 1.Allthefollowingcausescanleadtobadeyesightexcept. A.age B.height C.reading D.computers 2.Whatshouldyoudoifyouhavetoworkinfrontofthecomputer? A.Eathealthyfoods. B.Cleantheeyesbyusingcoldwater. C.Wearapairofsunglasses. D.Havearestafterworkingforawhile. 3.Ifweputthepassageintothreepartswhichofthefollowingisthebest? ①=Para.1②=Para.2③=Para.3④=Para.4⑤=Para.5 A.①;②;③④⑤ B.①②;③④;⑤ C.①;②③;④⑤ D.①;②③④;⑤ 4.Whichisthebesttitleofthepassage? A.WaysofEyeCare B.WaysofEyeExercises C.WaysofBeingHappy D.WaysofBeingHealthy
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