![已知：如图，梯形ABCD与梯形A′B′C′D′相似，AD∥BC，A′D′∥B′C′，∠A＝∠A′．AD＝4，A...]( "已知：如图，梯形ABCD与梯形A′B′C′D′相似，AD∥BC，A′D′∥B′C′，∠A＝∠A′．AD＝4，A...")
- 问题详情：已知：如图，梯形ABCD与梯形A′B′C′D′相似，AD∥BC，A′D′∥B′C′，∠A＝∠A′．AD＝4，A′D′＝6，AB＝6，B′C′＝12．求：(1)梯形ABCD与梯形A′B′C′D′的相似比k；(2)A′B′和BC的长；(3)D′C′∶DC．【回答】(1)k＝2∶3；(2)A＇B＇＝9，BC＝8；(3)3∶2．知识点：图形的相似题型：解答题...
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![如图，△ABC是一张锐角三角形的硬纸片．AD是边BC上的高，BC=40cm，AD=30cm．从这张硬纸片剪下一...]( "如图，△ABC是一张锐角三角形的硬纸片．AD是边BC上的高，BC=40cm，AD=30cm．从这张硬纸片剪下一...")
- 问题详情：如图，△ABC是一张锐角三角形的硬纸片．AD是边BC上的高，BC=40cm，AD=30cm．从这张硬纸片剪下一个长HG是宽HE的2倍的矩形EFGH．使它的一边EF在BC上，顶点G，H分别在AC，AB上．AD与HG的交点为M．（1）求*：；（2）求这个矩形EFGH的周长．【回答】【解答】（1）*：∵四边形EFGH为矩形，∴EF∥GH，∴∠AHG=∠ABC，又...
- 5840
![设0<p<1，随机变量ξ的分布列是ξ012P则当p在（0，1）内增大时，( )．A.D（ξ）减...]( "设0<p<1，随机变量ξ的分布列是ξ012P则当p在（0，1）内增大时，( )．A.D（ξ）减...")
- 问题详情： 设0<p<1，随机变量ξ的分布列是ξ012P则当p在（0，1）内增大时，()．A.D（ξ）减小 B.D（ξ）增大 C.D（ξ）先减小后增大 D.D（ξ）先增大后减小【回答】.D 知识点：统计题型：选择题...
- 6801
![如图，ABCD－A1B1C1D1为正方体，下面结论错误的是( )．A．AD∥平面CB1D1 ...]( "如图，ABCD－A1B1C1D1为正方体，下面结论错误的是( )．A．AD∥平面CB1D1 ...")
- 问题详情：如图，ABCD－A1B1C1D1为正方体，下面结论错误的是( )．A．AD∥平面CB1D1 B．AC1⊥BD ...
- 16322
![如图所示，a、b、c、d是正方形的四个顶点，O是正方形对角线的交点．ad边和bc边中点处放有等量异种点电荷+Q...]( "如图所示，a、b、c、d是正方形的四个顶点，O是正方形对角线的交点．ad边和bc边中点处放有等量异种点电荷+Q...")
- 问题详情：如图所示，a、b、c、d是正方形的四个顶点，O是正方形对角线的交点．ad边和bc边中点处放有等量异种点电荷+Q、Q，关于图中各点电势和电场强度的关系，下列说法正确的是（ ）A.a、O、c三点的电势关系为B.a、b、c、d四个顶点处的电场强度相等C.在两点电荷连线上，O点处的电场强度...
- 31891
![ad造句怎么写]( "ad造句怎么写")
- That'saninterestingad.aclassifiedad[advertisement]AnadvertisercancreateanAD.So,searchisonlyonepartoftheadmarket.Thoseadduptoaround25minutesofADtime.Anad-servingplatformthatanalyzesproduct-specificshopperbehaviorandbuyerintenttodecidewhatADtoserveinr...
- 12342
![四棱锥P—ABCD中,底面ABCD为直角梯形,BC//AD,AD⊥DC,BC=CD=l,AD=2,PA=PD,...]( "四棱锥P—ABCD中,底面ABCD为直角梯形,BC//AD,AD⊥DC,BC=CD=l,AD=2,PA=PD,...")
- 问题详情：四棱锥P—ABCD中,底面ABCD为直角梯形,BC//AD,AD⊥DC,BC=CD=l,AD=2,PA=PD,E为PC的中点,F为AD的中点,平面PAD⊥底面ABCD.⑴*：平面BEF⊥平而PAD;⑵若PC与底面ABCD所成的角为,求二面角E—BF—A的余弦值.【回答】知识点：点直线平面之间的位置题型：解答题...
- 13695
![AD 2000造句怎么写]( "AD 2000造句怎么写")
- Forexample,theyearAD2000isequaltotheyear2543BE.DevelopAutoCAD2000withVB;ShowingFEMStresswithAutoCAD2000VBA...
- 26924
![personal ad造句怎么写]( "personal ad造句怎么写")
- haveanaxetogrind:havepersonaladvantagestogainPortraitphotographyisapersonaladvantagesofamplification.Usetheinsideinformationforpersonaladvantageorthepersonaladvantageofothers"Tip"otherswhomaybuyorsellsecuritiesbecauseoftheinsideinformation....
- 7052
![如图，AB=AC=AD，若AD∥BC，∠C=78°，∠D= ．]( "如图，AB=AC=AD，若AD∥BC，∠C=78°，∠D= ．")
- 问题详情：如图，AB=AC=AD，若AD∥BC，∠C=78°，∠D= ．【回答】39°．【解答】解：∵AB=AC=AD，∴∠C=∠ABC，∠D=∠ABD，∴∠ABC=∠CBD+∠D，∵AD∥BC，∴∠CBD=∠D，∴∠ABC=∠D+∠D=2∠D，又∵∠C=∠ABC，∴∠C=2∠D．∵∠C=78°，∴∠D=39°，知识点：平行线的*质题型：填空题...
- 14679
![如图，已知AB∥DC，AD∥BC.*：（1）AB=CD；（2）AD=BC．]( "如图，已知AB∥DC，AD∥BC.*：（1）AB=CD；（2）AD=BC．")
- 问题详情：如图，已知AB∥DC，AD∥BC.*：（1）AB=CD；（2）AD=BC．【回答】．略知识点：三角形全等的判定题型：解答题...
- 9464
![如下图，CD⊥AD，CB⊥AB，AB=AD，求*：CD=CB.]( "如下图，CD⊥AD，CB⊥AB，AB=AD，求*：CD=CB.")
- 问题详情：如下图，CD⊥AD，CB⊥AB，AB=AD，求*：CD=CB.【回答】*：连结AC，CD⊥AD，CB⊥AB∴在Rt△ADC和Rt△ABC中∴Rt△ADC≌△Rt△ABC(HL)∴CD=CB.（本题也可用勾股定理直接*）知识点：三角形全等的判定题型：解答题...
- 9436
![ad nauseam造句怎么写]( "ad nauseam造句怎么写")
- Alright,solet'snowstartdoingmoreinterestingthingshellothanjustsayinghelloadnauseamtoourselves.Theprimeminister’sfavouritepronouncement,whichhelikestorepeatadnauseam,isthathisgovernmentwillnever“putitshandsinthepocketsoftheItalianpeople”....
- 15475
![AD]( "AD")
- 问题详情：AD【回答】如图8所示，光滑固定导轨M、N水平放置，两根导体棒P、Q平行放于导轨上，形成一个闭合回路，当一条形磁铁从高处下落接近回路时()A．P、Q将相互靠拢 B．P、Q将相互远离C．磁铁的加速度仍为g D．磁铁的加速度小于g知识点：楞次定律题型：多项选择...
- 22848
![local ad造句怎么写]( "local ad造句怎么写")
- Herlocaladmirersbeatapathtoherdoor.Bylaunchinglocal-languagewebsites,teamscantailormarketingtofitanindividualcountry,drumminguplocaladvertisingandsponsorshiprevenue.Wemustdevelopindustrieswithlocaladvantagesandpropelthedevelopmentofkeyareas....
- 29265
![classified ad造句怎么写]( "classified ad造句怎么写")
- aclassifiedad[advertisement]Sitestodayoffermuchmorethanthetypicalprofilepictureanddescriptioninaclassifiedadlisting.Thesite'sclassifiedadsectionreadslikeabillionaire'syardsale:'Forsale--CaviarServersandHornSpoons.''ForSale$2.8millionTsavoritegem...
- 27032
![Ad.1SpecialhouseinGlebe(S160everymonth)Replyto:Alalinpo...]( "Ad.1SpecialhouseinGlebe(S160everymonth)Replyto:Alalinpo...")
- 问题详情：Ad.1SpecialhouseinGlebe(S160everymonth)Replyto:Dateavailable:December9LookingforagirlstudentroommatetoshareawellsituatedhouseinGlebefornotlessthanonemonth.2minutesfromthebusstopinaquietstreet,doublelivingroometc.Givemeacallifinterested.Theroo...
- 22735
![ad val造句怎么写]( "ad val造句怎么写")
- AdvaloremdutyoradvaloremtaxadvalorempropertytaxoilandgasproductionequipmentadvaloremtaxAcompoundtariffisacombinationofaspecificandanadvaloremtariff.Compounddutiesareacombinationofspecificandadvaloremduties...
- 13591
![.如图,在△ABC中,AD是中线,求*:AD<(AB+AC).]( ".如图,在△ABC中,AD是中线,求*:AD<(AB+AC).")
- 问题详情：.如图,在△ABC中,AD是中线,求*:AD<(AB+AC).【回答】*:延长AD到点E,使DE=AD,连接BE,∴AE=2AD.∵AD是中线,∴BD=CD.在△ACD和△EBD中,∴△ADC≌△EDB(SAS),∴AC=BE.在△ABE中,∵AE<AB+BE,∴2AD<AB+AC,∴AD<(AB+AC).知识点：三角形全等的判定题型：解答题...
- 20761
![briefly ad造句怎么写]( "briefly ad造句怎么写")
- Amomentlatertheouterdooropened,brieflyadmittingsunlight,thenYvettewasgone.ThewindownarrativeoftheshallowlotusgreenupusesilkthreadtobrieflyadorntojoinDilotuspattern....
- 21880
![如图，AC⊥BC，AD⊥BD，AD=BC，AD，BC交于O.求*：OC=OD.]( "如图，AC⊥BC，AD⊥BD，AD=BC，AD，BC交于O.求*：OC=OD.")
- 问题详情：如图，AC⊥BC，AD⊥BD，AD=BC，AD，BC交于O.求*：OC=OD.【回答】知识点：三角形全等的判定题型：解答题...
- 19995
![officially ad造句怎么写]( "officially ad造句怎么写")
- PresidentTheodoreRooseveltofficiallyadoptedthetermin1902.aunitofmeasurementofcapacityforliquidsofficiallyadoptedintheUnitedStatesCustomarySystem.November2,1868,timezone:NewZealandofficiallyadoptsastandardtimetobeobservednationally.aunitofmeasuremento...
- 6077
![Ad-makerschoosewordsandbrandnamesverycarefullyinordert...]( "Ad-makerschoosewordsandbrandnamesverycarefullyinordert...")
- 问题详情： Ad-makerschoosewordsandbrandnamesverycarefullyinordertomakeacreativeimageoftheproducttheyare_________. A.processing B.producing C.providing D.promoting【回答】D知识点：动词题型...
- 16474
![如图，AD⊥AE，AB⊥AC，AD＝AE，AB＝AC.求*：△ABD≌△ACE. ...]( "如图，AD⊥AE，AB⊥AC，AD＝AE，AB＝AC.求*：△ABD≌△ACE. ...")
- 问题详情：如图，AD⊥AE，AB⊥AC，AD＝AE，AB＝AC.求*：△ABD≌△ACE. 【回答】*：∵AD⊥AE，AB⊥AC，∴∠CAB＝∠DAE＝90°.∴∠CAB＋∠CAD＝∠DAE＋∠CAD，即∠BAD＝∠CAE.在△ABD和△ACE中，∴△ABD≌△ACE.知...
- 24701
![Asicklittlegirlisbeingkeptalivethankstoherbestfriend—ad...]( "Asicklittlegirlisbeingkeptalivethankstoherbestfriend—ad...")
- 问题详情：Asicklittlegirlisbeingkeptalivethankstoherbestfriend—adogwhocarriesheroxygentankonhisback.Alida’sfaithfuldogcompanionMrGibbshasbeenspeciallytrainedtoshepherdthethree-year-old,whobreathesthroughatubemostofthetime.Hefollowshercloselyassheplay...
- 30644
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