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如图所示,在△ABC中,C=,BC=3,点D在边AC上,∠A=∠ABD,若BD=,则cosA=( )
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高一下学期数学《》真题及答案
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如图所示△ABC中E.F.D.分别是边ABACBC上的点且满足则△EFD与△ABC的面积比为.
如图所示在斜三棱柱ABC-
1
1
C
1
的底面△ABC中,∠A.=90°,且BC
1
⊥AC,过
1
作C.
1
H.⊥底面ABC,垂足为H.,则点H.在( ). A.直线AC上B.直线AB上 C.直线BC上
△ABC内部
如图所示在△ABC中D.是AB上一点F.是BC上一点DE∥BC交AC于点E.若△ADE与△ABC的面
如图所示在△ABC中AB=AC=5D.是BC上的点DE∥AB交AC于点E.DF∥AC交AB于点F.
5
10
15
20
如图所示点D.是△ABC的边AC上一点不含端点AD=BD则下列结论正确的是
AC>BC
AC=BC
∠A.>∠ABC
∠A.=∠ABC
将三角形纸片△ABC按如图所示的方式折叠使点B.落在边AC上记为点B.′折痕为EF.已知AB=AC=
将三角形纸片△ABC按如图所示的方式折叠使点B.落在边AC上记为点B.′折痕为EF.已知AB=AC=
如图所示在△ABC中∠C.=90°∠A.=30°BC=1.在三角形内挖去半圆圆心O.在边AC上半圆分
如图所示在△ABC中∠BAC=120°AB=2AC=1D.是边BC上一点包括端点则·的取值范围是__
如图所示△ABC中点M.是BC的中点点N.在边AC上且AN=2NCAM与BN相交于点P.求APPM
如图所示点D是△ABC的边AC上一点不含端点AD=BD则下列结论正确的是
AC>BC
AC=BC
∠A>∠ABC
∠A=∠ABC
如图所示△ABC的外接圆圆心O.在AB上点D.是BC延长线上一点DM⊥AB于M.交AC于N.且AC=
如图所示在△ABC中点M.是BC的中点点N.在边AC上且AN=2NCAM与BN相交于点P.求AP∶P
如图所示D.E.分别是△ABC的边ACBC上的点若△ADB≌△EDB≌△EDC则∠C.的度数为
15°
20°
25°
30°
如图△ABC中∠C.=90°AC=3点P.是边BC上的动点则AP长不可能是
2.5
3
4
5
如图所示D.是△ABC的边BC上的一点且∠1=∠2∠3=∠4∠BAC=63°则∠DAC=.
如图所示在△ABC中D.E.分别是边AC.BC上的点若△ADB≌△EDB≌△EDC则∠C.的度数为
15°
20°
25°
30°
如图所示在△ABC中∠C.=90°D.是AC上一点DE⊥AB于点E.若AB=10BC=6DE=2求四
在△ABC中AB=AC点D.在边BC所在的直线上过点D.分别作DE∥AC交直线AB于点E.DF∥AB
在△ABC中AB=AC点D.在边BC所在的直线上过点D.作DF∥AC交直线AB于点F.DE∥AB交直
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Ifyouarehavingtroublefallingasleepyouarenotalone.About65%ofAmericanssaidtheyhavesleepingproblemsafewnightseachweekaccordingtoarecentstudybytheNationalSleepFoundation.Sleepingtoolittlecanleadtoahigherriskofbecomingfatandgettingdepressed沮丧的.Butbeforeyougotoadoctorforadviceitisworthexaminingyoursleepinghabitsonemoretime.Someofyourfavoriteeveninghabitsmayhavesomethingtodowiththesleepingproblems. SettingaBrightAlarmClock Thelightofyourbrightalarmclockcanpreventyoufromfallingasleep.Youcanmakeyourroomasdarkaspossible.Coverthebrightnumberswithabookorconsiderbuyingasmalltravelclock.Yourcellphonealarmmayalsodothetrick. CountingSheep Whenyoujustcan'tfallasleepit'suselesstostayinbedtocountsheep.Ifyou'vebeentryingtofallasleepformorethan30minutestheNationalSleepFoundationsuggestsyougetuptodosomereadingorwatchTVforawhile.Suchactivitieswillmakeyousleepy.Beforeyouknowityou'llbegoingbacktobedreallytired. ExercisingLateatNight Daytimeworkouts锻炼willkeepyoufullofenergyforhours.That'swhyyoudon'twanttoexercisewithinthreehoursofhittingthesack.Fierce剧烈的physicalactivityraisesyourbodytemperatureandpumpsyourenergylevel﹣botharebadforagoodnight'ssleep. 1Whatcanwelearnfromthefirstsentenceofthepassage? A.It'snotgoodtofailtofallasleepatnight. B.Peopleinagoodcompanyoftenhavesleepingproblems. C.Therearemanypeoplewhohavesleepingproblems. D.Youshouldfindsomeonetotalktoifyoucan'tfallasleep. 2Theunderlinedparthittingthesackinthelastparagraphmeans. A.goingbackhome B.goingtobed C.goingtothegym健身馆 D.fallingasleep 3Bywritingthepasagethewritermainlywantstotellus. A.whysomanypeoplecan'tsleepwellatnight B.howtoenjoyagoodnight'ssleep C.thatsleepingproblemsaretroublingmoreandmorepeople D.thatpeoplemaysolvetheirsleepingproblemsbysomehabits
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位于湖南省西北部距离湖南省会长沙约300公里占地面积9563平方千米的张家界是一座因独特的自然景色和丰富的旅游资源而闻名的旅游城市.
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AfatherwasworriedabouthissonsohisfatherdecidedtocallonaBuddhistmonk禅师totrainhisboy1wassixteenyearsoldbuthadnocourageatall. TheBuddhistmonksaid2theboy'sfatherYoushouldleaveyoursonalonehere.I'llmakehimintoarealmanwithinthreemonths.3youcan'tcometoseehimduringthisperiod. Threemonthslatertheboy'sfatherreturned.TheBuddhistmonkarrangedaboxingmatchbetweentheboyandan4experienceboxer.Eachtimethefighter5striketheboyhefelldownbutatoncetheboystoodupandeachtimetheboywasknockeddowntheboystoodupagain.SeveraltimeslatertheBuddhistmonkasked6doyouthinkofyourchild?Whatashame!theboy'sfathersaidIneverthoughthewouldbeso7easyknockeddown.Ineedn'thavehimlefthere8longer. Iamsorrythatisallyousee.Don'tyouseethateachtimehefallsdownhestandsupagaininsteadof9cry?That'sthekindofcourageyouwantedhim10have.
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CassandraFeeleyfindsithardtomanageonherhusband'sincome.SothisyearshedidsomethingmorethanahobbySheplantedvegetablesinheryard.ForherfirstgardenMs.Feeleyhasputin40tomatoplantsandfiverowsofavarietyofvegetables.Thefamily'soldfarmhousehasbecomeachickenhouseitsresidentsarrivingnextmonth.LastyearMs.RitaGartinkeptasmallgarden.ThisyearshehasmadeitmuchlargerbecauseshesaidThecostofeverythingisgoingupandIwaslookingtoloseafewpoundstoosoit'sawin﹣winsituationallaround. TheyareamongthegrowingnumberofAmericanswhodrivenbyhigherlivingcostsandafallingeconomyhavetakenupvegetablegardeningforthefirsttime.Othershaveincreasedthesizeoftheirexistinggardens.Seedcompaniesandgardenshopssaythatnotsincethe1970shastherebeensuchanincreaseininterestingrowingfoodathome.Nowmanygardensacrossthecountryhavebeensoldoutforseveralmonths.InAustinTex.someofthegardenshaveathree﹣yearwaitinglist. GeorgeC.BallJr.ownerofacompanysaidsalesofvegetableseedsandplantsareupby40%overlastyeardoubletheaveragegrowthofthelastfiveyears.Mr.Ballarguesthatsomeofthereasonshavebeenbuildingforthelastfewyears.Thebigoneisthestrikingriseinthecostoffoodlikebreadandmilktogetherwiththeincreasesinthepriceoffruitsandvegetables.Foodpriceshaveincreasedbecauseofhigheroilprices.Peoplearenowdrivinglesstakingfewervacationssothereismoretimetogarden. 1WhatdoesthewordresidentsinParagraph1probablyreferto? A.tomatoes B.chickens C.gardens D.people 2Whyisvegetablegardeningbecomingincreasinglypopular? A.There'sagrowingneedforfruits. B.Thepriceofoilislowerthanbefore. C.Thecostoflivingisgenerallyontherise. D.MoreAmericansaretryingnewthingsorfun. 3Whichofthefollowingmightbethebesttitleforthetext? A.ABelttighteningMove B.FamilyFoodPlanning C.BankingonGardening D.GardeningasaHobby
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它吸引力越来越多的国内外游客.
OceanParkAcademyHongKongOPAHK1provideenvironmentaleducationalprograms2blendinto融入theschoolcurriculum.Theseprogramsofferdiverselearningopportunitiesandencouragestudentstoappreciateandbondwithnature.Theyinclude3experientiallearningapproachwithstudentsmakingdiscoveriesandreceivinginspirationthrough4theyownobservations. Inour5lateprogramsthelearningprocessisevenmoreinteractiveandstudentslearnthrough6explore.Therearemoreopportunitiesforactiveparticipationandmoretimeforreflectionand7share.Students'insightscanthenbeintegratedintotheirdailylives.ASTEAMelementisprogressivelyintroduced8ourschoolprogramstomotivatethestudents9thinkandtofacilitateself﹣learning.OPAHKalsofeaturesaTeacherDayCamptoinspireandassistteacherswithimplementingenvironmentaleducation.10in﹣parkactivitiesOPAHKalsoorganizesoutreachseminars推广研讨会andproject﹣basedlearningprogramsinschools.
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\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意每处错误及其修改均仅限一词只允许修改10处多者从第11处起不计分. DearMissWang I'mhavingsometroubleaboutmyclassmatesatthemoment.I'mgettingwellwithaboyinmyclass.Weoftendohomeworktogetherandweenjoyhelpeachother.Wehavebecomerealgoodfriends.Butotherstudentshavestartedgossiping.TheysaidthatthisboyandIhavefalleninlovethishasmademeangry.I'mnotverygoodatcommunicatingwithpeople.AlthoughItrytoexplainbutIstillfindithardtomakeothersconvinced.Idon'twanttoendthefriendshipbutIhateothergossipingWhatshouldIdo?Iwouldbegratefulthatyoucouldgivemesomeadvices. Yours Lisa
Ispentthewholedaylookingaroundandfoundthehousedisappeared完全地.
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