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如图:∠B=∠C,DE⊥BC于E,EF⊥AB于F,∠ADE等于140°,∠FED=
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如图所示E.是正方形ABCD的边AB上的一点EF⊥DE交BC于点F.1求证△ADE∽△BEF.2若A
已知Rt△ABC≌Rt△ADE其中∠ACB=∠AED=90°.1将这两个三角形按图①方式摆放使点E.
如图已知在△ABC中∠BAC>90°点D.为BC的中点点E.在AC上将△CDE沿DE折叠使得点C.恰
AE=EF
AB=2DE
△ADF和△ADE的面积相等
△ADE和△FDE的面积相等
如图给出下列四组条件①AB=DEBC=EFAC=DF②AB=DE∠B.=∠E.BC=EF③∠B.=∠
1组
2组
3组
4组
如图∠1=∠2要证明△ABC≌△ADE还需补充的条件是
AB=AD,AC=AE
AB=AD,BC=DE
AB=DE,BC=AE
AC=AE,BC=DE
如图AB∥DEAC∥DFAC=DF下列条件中不能判断△ABC≌△DEF的是
AB=DE
∠B=∠E
EF=BC
EF∥BC
如图1四边形ABCD中AD∥BCAB⊥BC点E在边AB上∠DEC=90°且DE=EC.1求证△ADE
如图8AB∥DE∠1=∠ACBAC平分∠BAD1试说明:AD∥BC.2若∠B.=80°求∠ADE的度
如图已知∠1=∠2要证明△ABC≌△ADE还需补充的条件是
AB=AD,AC=AE
AB=AD,BC=DE
AC=AE,BC=DE
以上都不对
如图给出下列四组条件①AB=DEBC=EFAC=DF②AB=DE∠B.=∠E.BC=EF③∠B.=∠
1组
2组
3组
4组
如图DEF分别是△ABC的ABACBC边上的点且DE∥BCEF∥AB.求证△ADE∽△EFC.
如图9-41△ABC中DE∥BCEF∥AB试说明△ADE∽△EFC.图9-41
如图在直角梯形ABCD中AD∥BC∠A.=90ºAB=AD=6DE⊥CD交AB于E.DF平分∠CDE
如图给出下列四组条件①AB=DEBC=EFAC=DF②∠AB=DE∠B=∠EBC=EF③∠B=∠EB
1组
2组
3组
4组
如图所示△ABC≌△EFD∠B.与∠F.是对应角那么
AB=DE, AC=EF, BC=DF
AB=DF, AC=DE, BC=EF
AB=EF, AC=DE, BC=DF
AB=EF, AC=DF, BC=DE
如图所示下列各组条件中能判定△ABC≌△DEF的是
AB=DE,BC=EF,∠A=∠D
∠A=∠D,∠C=∠F,AC=EF
∠A=∠D,∠B=∠E,∠C=∠F
AB=DE,BC=EF,△ABC的周长=△DEF的周长
如图在△ABC中DE∥BCEF∥AB求证△ADE∽△EFC.
如图AD是角平分线E.是AB上一点AE=ACEF∥BC交AC于F.下列结论①△ADC≌△ADE②CE
①②③
①
②
③
如图9-41△ABC中DE∥BCEF∥AB试说明△ADE∽△EFC.
如图给出下列四组条件①AB=DEBC=EFAC=DF②AB=DE∠B.=∠E.BC=EF③∠B.=∠
1组
2组
3组
4组
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画出图中杠杆上的力F1F2的力臂L1L2
如图1所示的钢丝钳其中A是剪钢丝处B为手的用力点O为转动轴支点图2为单侧钳柄及相连部分示意图.请在图2中画出钢丝钳剪钢丝时的动力臂L1和阻力F2.
如图AB是⊙O的直径点C在⊙O上过点C的切线交AB的延长线于点D∠ACD=120° 1求证AC=CD 2若⊙O的半径为2求图中阴影部分的面积.
画出图中杠杆上的力F1F2的力臂L1L2
IntheeighteenthcenturyoneofthefirstmoderneconomistsAdamSmiththoughtthatthewholeannualproduceofthelandandlabourofeverycountryprovidedrevenuetothreedifferentordersofpeoplethosewholivebyrentthosewholivebywagesandthosewholivebyprofit.Eachsuccessivestageoftheindustrialrevolutionhowevermadethesocialstructuremorecomplicated. Manyintermediategroupsgrewupduringthenineteenthcenturybetweentheuppermiddleclassandtheworkingclass.Thereweresmall﹣scaleindustrialistsaswellaslargeonessmallshopkeepersandtradesmenofficialsandsalariedemployeesskilledandunskilledworkersandprofessionalmensuchasdoctorsandteachers.Farmersandpeasantscontinuedinallcountriesasindependentgroups. Duringthenineteenthandearlytwentiethcenturiesthepossessionofwealthinevitablyaffectedaperson'ssocialposition.Intelligentindustrialistswithinitiativemadefortunesbytheirwitswhichliftedthemintoaneconomicgroupfarhigherthanthatoftheirworking﹣classparents.Buttheylackedsocialtrainingoftheupperclasswhodespisedthemasthenewrich. Theyoftensenttheirsonsanddaughterstospecialschoolstoacquiresocialtraining.Heretheirchildrenmixedwiththechildrenoftheupperclasseswereacceptedbythemandveryoftenfoundmarriagepartnersfromamongthem.Inthesamewayathriftyhardworkinglabourerthoughnotcleverhimselfmightsaveforhissonenoughtopayforanextendedsecondaryschooleducationinthehopethathewouldmoveinawhite﹣collaroccupationcarryingwithitahighersalaryandamoveupinthesocialscale. Inthetwentiethcenturytheincreasedtaxationofhigherincomesthegrowthofthesocialservicesandthewiderdevelopmentofeducationalopportunityhaveconsiderablyalteredthesocialoutlook.Theupperclassesnolongerarethesoleoreventhemainpossessorsofwealthpowerandeducationthoughinheritedsocialpositionstillcarriesconsiderableprestige. 21.WhatcriteriondidAdamSmithseemtogobyinhisclassificationofsocialgroups? A.Theamountofwealth B.Theamountofmoney C.Thesocialstatus D.Thewayofgettingmoney 22.IfyoucomparethefirstandsecondparagraphwhatgroupsofpeopledidAdamSmithleaveoutinhisclassification? A.Officialsandemployees. B.Peasantsandfarmers. C.Doctorsandteachers. D.Tradesmenandlandlords. 23.Whowerethe'newrich'duringthenineteenthandearlytwentiethcenturies? A.Theywerestilltheupperclasspeople. B.Theywereownersoflargefactories. C.Theywereintelligentindustrialists. D.Theywereskilledworkerswhomadetheirfortune. 24.Accordingtothepassagewhatdidthosepeopledowhointendedtomaketheirchildrenmoveupinthesocialladder? A.Theysavedalotofmoneyfortheirchildrentoreceivehighereducation. B.Theytriedtofindmarriagepartnersfromthechildrenoftheupperclass. C.Theymadegreaterfortunesbytheirwits. D.Theyworkedevenhardertoacquiresocialtraining. 25.Inthetwentiethcenturyclassdifferenceshavebeenpartlysmoothedoutby. A.increasedincomeanddecreasedtaxation B.taxationsocialservicesandeducationalopportunities C.educationtheincreaseofincomeandindustrialdevelopment D.thedecreaseoftheupperclasspopulation.
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