18B.45C.63D.81的知识精选

在等差数列{an}中，a3+a4+a5+a6+a7=45，则S9=（　　）　A．18B．45C．63D．81

2021-04-15 问题详情：在等差数列{an}中，a3+a4+a5+a6+a7=45，则S9=（）A．18B．45C．63D．81【回答】解答：解：∵等差数列{an}中，a3+a4+a5+a6+a7=5a5=45，∴a5=9；∴S9===9a5=81．故选D．知识点：数列题型：选择题...

81． WhenIwaslittle,Friday’snightwasourfamilygamenight...

2019-02-02 问题详情：81． WhenIwaslittle,Friday’snightwasourfamilygamenight.Aftersupper,wewouldplaycardgamesofallsortinthesittingroom.Asthekid,Ilovedtowatchcartoons,butnomatterhowmanytimesIaskedtowatchingthem,...

81.Farmworkersspendmostoftheirtime

2020-12-17 问题详情：81.Farmworkersspendmostoftheirtime_____________.(在户外)82.Weusuallygooutforawalkat__________.(黄昏)83.Idideverythinginmy____________(能力；力量)tohelpyou.84.BillandIoften____________(不同意；有分...

81.Iknow

2022-01-12 问题详情：81.Iknow______________(肯定地)howIcansolvetheproblem.82.Godhelpsthosewho_____________(依靠)themselves.83.Allthemoneyhehadhadbeen_________________(用完),sohehadtomakealivingby begging.84.Wes...

81.Canyout

2021-02-22 问题详情：81.Canyout____________（忍受）suchalongperiodofworktime?82．Inordertomake____________(准备)forthecomingcompetition,hedevoteshissparetimetoreadingeveryday. aref____________tousemobilephonesinschoo...

“WASP-18b”可以造什么句，WASP-18b造句

2018-03-13 WASP-18bisroughly10timesthemassofJupiter,anditorbitsonlyabout3millionkilometersfromitsstar.WASP-18b,whichwasdiscoveredwithtwintelescopeslocatedintheCanaryIslandsandSouthAfrica,islocatedabout400light-y...

（﹣81）÷2×（﹣）÷（﹣16）.

2022-08-18 问题详情：（﹣81）÷2×（﹣）÷（﹣16）.【回答】解：（﹣81）÷2×（﹣）÷（﹣16）=﹣81×××=﹣1．知识点：有理数的乘除法题型：计算题...

81.Theteamp

2021-02-24 问题详情：81.Theteamp___________whentheyrealizedtheywerelostandindanger.82.Christmasisaroundthecorner.It’stimetoputsomed______ ontheChristmas trees.83.Thebookistoodifficult!I’mafraidIwon’tbeabletor...

Iwenttoseethefilmaftersupper.Onmywaytothe 81.

2020-07-21 问题详情：Iwenttoseethefilmaftersupper.Onmywaytothe 81._______________cinema.ImetanEnglishwoman,wholostherway. 82._______________Igaveupthechanceseethefilmandtookhertoher ...

81.Thesungivesofflightandwarmth,thatmakesitpossibleforp...

2019-08-05 问题详情：81.Thesungivesofflightandwarmth,thatmakesitpossibleforplantstogrow.82.Whenandwherewillthenextmeetingheld?83.Notonlytheteacherbutalsothestudentshastheireyesexaminedregularly.84.Theyoungmanishig...

81.Thefarmersinthisareahadagoodharvestlastyearthanks...

2022-08-11 问题详情： 81.Thefarmersinthisareahadagoodharvestlastyearthankstothes_____________farming. 82.Hewasa____________________inthebook. 83.Hefinishedhisworkinap__________________（积极的）wa...

81.With

2020-09-26 问题详情：________________________________________,someanimalsarefacingthedangerofdyingout.(cut) 由于越来越多的森林被砍伐,一些动物正面临着灭绝的危险。larly____________________________________________Am...

81.Thosewhob

2021-03-16 问题详情：81.Thosewhob___________theircountrieswerehatedbyallthepeople.82.Theirteamiss___________,andit’shardforustobeat them.83.Alicemusthavedonesomethingwrong,becauseshe’slookingsog__________84.Boy...

81.Itmakesasensetoworkontheproblembeforeitgetsoutofcont...

2019-06-14 问题详情：makesasensetoworkontheproblembeforeitgetsoutofcontrol.rbinginthebookshewasreading,sheforgotlunch.teachercuredhimhisbadhabitsandhemadegreatprogressinEnglish.[Z-X-X-K]hertheteachernorthestudents...

（﹣81）÷2+÷（﹣16）；

2020-10-13 问题详情：（﹣81）÷2+÷（﹣16）；【回答】原式=﹣81×﹣×=﹣36；知识点：有理数的乘除法题型：计算题...

81.Itisc

2021-05-16 问题详情：81.Itisc_______________ofmybosstoallowmetohaveadayoffonMother’sDay.82.Youcan’texpectthatalltheproblemscanbe____________(解决)inaveryshorttime.83.Ana________________mustbemadebeforeyouseeyour...

4x2=81；

2021-12-31 问题详情：4x2=81；【回答】解：∵x2=，∴x=±=±；知识点：平方根题型：计算题...

16x2＝81；

2021-06-26 问题详情：16x2＝81；【回答】x＝±；（知识点：平方根题型：计算题...

81.It’sthefirsttimethatIhadseenthemoviestarfacetoface.8...

2020-08-12 问题详情：81.It’sthefirsttimethatIhadseenthemoviestarfacetoface.82.EnglishisoneoftheofficiallanguageusedinIndia.83.Althoughhetriestotalktomyclassmates,butIstillfindithardtomakefriendswithhim.84.Believi...

81. ...

2019-11-23 问题详情：81. Inagesturetohelppreservehistory,theGreekgovernmenta ▲ ...

81.Paul

2020-03-29 问题详情：____ ____ (把手伸进）hispockettogethisphone.finishedtheworkonhisown____ ____ (因为）nobodyhelpedhim.83.____ ____ ____ (不是每一种）of birdcanfly.Saxons'svictoryabout600yearsearlier...

3x3=-81

2020-11-29 问题详情：3x3=-81【回答】知识点：平方根题型：计算题...

81.Hebrokedownthe

2020-02-01 问题详情：81.Hebrokedownthe_________(壁垒)thathadexistedbetweenracesandstylesofmusic.82.Their_________(complain)seemsillynow,butbackthenrockandrollwasallthemorepopularwiththeyouthbecauseparentsandgrandp...

10Iliveinasmalltowninthesouth.Thisistypical 81.

2020-11-08 问题详情：10Iliveinasmalltowninthesouth.Thisistypical 81.________________Chinesetown.Therearenotonlytwomainstreets 82.________________whichacrossinthemiddleofthetown.Aroundthe...

81.Theyfoundtheremainsofbuildingburiedb

2020-11-20 问题详情：81.Theyfoundtheremainsofbuildingburiedb____________(在…下面)thesand.82.Iamsuggestingtoyouthatthereisa______________(区别))betweentruthandso-calledreality.83.Thenewly-builtrailwaywillbe_______...