关于18B.45C.63D.81的知识

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...

问题详情：81.Farmworkersspendmostoftheirtime_____________.(在户外)82.Weusuallygooutforawalkat__________.(黄昏)83.Idideverythinginmy____________(能力；力量)tohelpyou.84.Billan...

问题详情：81.                                                                Inagesturetohelppreservehistory...

问题详情：81.Thosewhob___________theircountrieswerehatedbyallthepeople.82.Theirteamiss___________,andit’shardforustobeat them.83.Alicemusthavedonesomethingwrong,becausesh...

问题详情：____  ____ (把手伸进）hispockettogethisphone.finishedtheworkonhisown____  ____ (因为）nobodyhelpedhim.83.____  ____  ____ (不是每一种）of birdcanfly.Saxons...

问题详情：81.Theyfoundtheremainsofbuildingburiedb____________(在…下面)thesand.82.Iamsuggestingtoyouthatthereisa______________(区别))betweentruthandso-calledreality.83.Then...

问题详情：81.It’sthefirsttimethatIhadseenthemoviestarfacetoface.82.EnglishisoneoftheofficiallanguageusedinIndia.83.Althoughhetriestotalktomyclassmates,butIstillfindithardt...

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

问题详情：81.Thesungivesofflightandwarmth,thatmakesitpossibleforplantstogrow.82.Whenandwherewillthenextmeetingheld?83.Notonlytheteacherbutalsothestudentshastheireyesexamine...

WASP-18bisroughly10timesthemassofJupiter,anditorbitsonlyabout3millionkilometersfromitsstar.WASP-18b,whichwasdiscoveredwithtwintelescopeslocatedintheCanaryIslandsandSouthA...

问题详情：81.Canyout____________（忍受）suchalongperiodofworktime?82．Inordertomake____________(准备)forthecomingcompetition,hedevoteshissparetimetoreadingeveryday.  aref______...

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...

问题详情：81.Theteamp___________whentheyrealizedtheywerelostandindanger.82.Christmasisaroundthecorner.It’stimetoputsomed______ ontheChristmas trees.83.Thebookistoodiffic...

问题详情：81.Itisc_______________ofmybosstoallowmetohaveadayoffonMother’sDay.82.Youcan’texpectthatalltheproblemscanbe____________(解决)inaveryshorttime.83.Ana____________...

问题详情：10Iliveinasmalltowninthesouth.Thisistypical    81.________________Chinesetown.Therearenotonlytwomainstreets          82.________________whichacrossi...

问题详情：makesasensetoworkontheproblembeforeitgetsoutofcontrol.rbinginthebookshewasreading,sheforgotlunch.teachercuredhimhisbadhabitsandhemadegreatprogressinEnglish.[Z-X-X...

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________________...

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

问题详情：81．   WhenIwaslittle,Friday’snightwasourfamilygamenight.Aftersupper,wewouldplaycardgamesofallsortinthesittingroom.Asthekid,Ilovedtowatchcartoons,butnomatterhow...

问题详情：   81.Thefarmersinthisareahadagoodharvestlastyearthankstothes_____________farming.    82.Hewasa____________________inthebook.     83.Hefinishedhiswork...

问题详情：81.Iknow______________(肯定地)howIcansolvetheproblem.82.Godhelpsthosewho_____________(依靠)themselves.83.Allthemoneyhehadhadbeen_________________(用完),sohehadtom...

问题详情：3x3=-81【回答】知识点：平方根题型：计算题...

问题详情：Iwenttoseethefilmaftersupper.Onmywaytothe      81._______________cinema.ImetanEnglishwoman,wholostherway.          82._______________Igaveupthecha...

问题详情：81.Hebrokedownthe_________(壁垒)thathadexistedbetweenracesandstylesofmusic.82.Their_________(complain)seemsillynow,butbackthenrockandrollwasallthemorepopularwitht...

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...