AC4.AD的精選

在△ABC中，∠BAC=90°，AB=3，AC=4．AD平分∠BAC交BC於D，則BD的長爲（　　）

2020-05-05

問題詳情：在△ABC中，∠BAC=90°，AB=3，AC=4．AD平分∠BAC交BC於D，則BD的長爲（）【回答】A 知識點：勾股定理題型：選擇題...

如下圖，CD⊥AD，CB⊥AB，AB=AD，求*：CD=CB.

2022-04-11

問題詳情：如下圖，CD⊥AD，CB⊥AB，AB=AD，求*：CD=CB.【回答】*：連結AC，CD⊥AD，CB⊥AB∴在Rt△ADC和Rt△ABC中∴Rt△ADC≌△Rt△ABC(HL)∴CD=CB.（本題也可用勾股定理直接*）知識點：三角形全等的判定題型：解答題...

用“ad nauseam”造句大全，ad nauseam造句

2018-01-25

Alright,solet'snowstartdoingmoreinterestingthingshellothanjustsayinghelloadnauseamtoourselves.Theprimeminister’sfavouritepronouncement,whichhelikestorepeatadnauseam,isthathisgovernmentwillnever“put...

如圖，AD⊥AE，AB⊥AC，AD＝AE，AB＝AC.求*：△ABD≌△ACE. ...

2019-07-30

問題詳情：如圖，AD⊥AE，AB⊥AC，AD＝AE，AB＝AC.求*：△ABD≌△ACE. 【回答】*：∵AD⊥AE，AB⊥AC，∴∠CAB＝∠DAE＝90°.∴∠CAB＋∠CAD＝∠DAE＋∠...

用“ad val”造句大全，ad val造句

2018-11-18

AdvaloremdutyoradvaloremtaxadvalorempropertytaxoilandgasproductionequipmentadvaloremtaxAcompoundtariffisacombinationofaspecificandanadvaloremtariff.Compounddutiesareacombinationofspecificandadvaloremd...

用“ad”造句大全，ad造句

2017-07-29

That'saninterestingad.aclassifiedad[advertisement]AnadvertisercancreateanAD.So,searchisonlyonepartoftheadmarket.Thoseadduptoaround25minutesofADtime.Anad-servingplatformthatanalyzesproduct-specificsho...

用“officially ad”造句大全，officially ad造句

2017-06-23

PresidentTheodoreRooseveltofficiallyadoptedthetermin1902.aunitofmeasurementofcapacityforliquidsofficiallyadoptedintheUnitedStatesCustomarySystem.November2,1868,timezone:NewZealandofficiallyadoptsastan...

用“briefly ad”造句大全，briefly ad造句

2018-03-19

Amomentlatertheouterdooropened,brieflyadmittingsunlight,thenYvettewasgone.ThewindownarrativeoftheshallowlotusgreenupusesilkthreadtobrieflyadorntojoinDilotuspattern....

用“spiritually ad”造句大全，spiritually ad造句

2018-04-24

Thisusuallyhappenstopeoplewhowereveryspirituallyadvancedintheirpreviouslives.ThispartofmewantstoprovethatI'mgoodatmeditating,thatI'mspirituallyadvanced,thatI'vereachedsomeoptimallevelofserenity.The...

用“local ad”造句大全，local ad造句

2018-11-30

Herlocaladmirersbeatapathtoherdoor.Bylaunchinglocal-languagewebsites,teamscantailormarketingtofitanindividualcountry,drumminguplocaladvertisingandsponsorshiprevenue.Wemustdevelopindustrieswithlocaladv...

.如圖,在△ABC中,AD是中線,求*:AD<(AB+AC).

2020-08-13

問題詳情：.如圖,在△ABC中,AD是中線,求*:AD<(AB+AC).【回答】*:延長AD到點E,使DE=AD,連接BE,∴AE=2AD.∵AD是中線,∴BD=CD.在△ACD和△EBD中,∴△ADC≌△EDB(SAS),∴AC=BE.在△ABE中,∵AE<AB+BE,∴2AD<AB+AC,∴AD<(AB+...

四棱錐P—ABCD中,底面ABCD爲直角梯形,BC//AD,AD⊥DC,BC=CD=l,AD=2,PA=PD,...

2019-04-17

問題詳情：四棱錐P—ABCD中,底面ABCD爲直角梯形,BC//AD,AD⊥DC,BC=CD=l,AD=2,PA=PD,E爲PC的中點,F爲AD的中點,平面PAD⊥底面ABCD.⑴*：平面BEF⊥平而PAD;⑵若PC與底面ABCD所成的角爲,求二面角E—BF—A的餘弦值.【回答】知...

用“Internet ad”造句大全，Internet ad造句

2018-03-26

CowansaysshehopesoneofthosedonorswillanswerherInternetad.First,thesystemmustbeabletoreade-mailmessagesandautomaticallyextractandindexinformationsuchaspropernames,Internetaddresses,streetaddresses,phon...

用“appropriately ad”造句大全，appropriately ad造句

2018-02-07

WeseektoappropriatelyaddresstheseproblemstogetherwiththeUSthroughequalconsultationinaconstructivemanner.Withthedevelopmentofthenaturalgasindustry,theChinesegovernmentwillappropriatelyadjustitsnaturalg...

Ad-makerschoosewordsandbrandnamesverycarefullyinordert...

2021-09-01

問題詳情： Ad-makerschoosewordsandbrandnamesverycarefullyinordertomakeacreativeimageoftheproducttheyare_________. A.processing B.producing C.providing ...

用“reasonably ad”造句大全，reasonably ad造句

2016-11-09

Thisarticleexaminesmainreasonstoleadtotheexcessinengineeringestimationduringengineeringconstruction,putsforwardswaytoreasonablyadjustengineeringestimationfromseveralaspects.Torealizepopulationandecono...

如圖，AB=AC=AD，若AD∥BC，∠C=78°，∠D=　　．

2019-09-25

問題詳情：如圖，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°，知識...