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簡介：第1頁高三數(shù)列專題訓(xùn)練二學(xué)校___________姓名___________班級(jí)___________考號(hào)___________一、解答題一、解答題1．在公差不為零的等差數(shù)列中，已知，且成等比數(shù)列．??NA23A?137AAA、、（1）求數(shù)列的通項(xiàng)公式；??NA（2）設(shè)數(shù)列的前項(xiàng)和為，記，求數(shù)列的前項(xiàng)和．??NANNS292NNBS???NBNNT2．已知等差數(shù)列的前項(xiàng)和為，公差成等比數(shù)列??NANNS,50,053???SSD且1341,,AAA（Ⅰ）求數(shù)列的通項(xiàng)公式；??NA（Ⅱ）設(shè)是首項(xiàng)為1，公比為3的等比數(shù)列，求數(shù)列??NB的前N項(xiàng)和NT??????NNAB3．設(shè)等比數(shù)列的前項(xiàng)和為，，且，，成等差數(shù)列，數(shù)列??NANNS218A?1116S?2S3S??NB滿足．2NBN?（1）求數(shù)列的通項(xiàng)公式；??NA（2）設(shè)，若對(duì)任意，不等式恒成立，求NNNCAB??NN?121212NNCCCS???????的取值范圍．?4．已知等差數(shù)列{}的公差，其前項(xiàng)和為，且等比數(shù)列{}滿足，NA2D?NNSNB11BA?24BA?，．313BA?（Ⅰ）求數(shù)列{}的通項(xiàng)公式和數(shù)列{}的前項(xiàng)和；NANBNNB（Ⅱ）記數(shù)列{}的前項(xiàng)和為，求．1NSNNTNT5．設(shè)數(shù)列的前項(xiàng)和為，且滿足．??NANNS??21,2,3,NNSAN????（1）求數(shù)列的通項(xiàng)公式；??NA（2）若數(shù)列滿足，且，求數(shù)列的通項(xiàng)公式；??NB11B?1NNNBBA?????NB（3）設(shè)，求數(shù)列的前項(xiàng)和．??3NNCNB????NCNNT6．已知差數(shù)列等的前項(xiàng)和，且對(duì)于任意的正整數(shù)滿足??NANNSN21NNSA??（1）求數(shù)列的通項(xiàng)公式；??NA第3頁是等差數(shù)列??NNBA?（I）求數(shù)列和的通項(xiàng)公式；??NA??NB（II）求數(shù)列的前N項(xiàng)和。??NB14．設(shè)數(shù)列滿足，{}NA321212222NNAAAAN???????NN?（1）求數(shù)列的通項(xiàng)公式；{}NA（2）設(shè)，求數(shù)列的前項(xiàng)和111NNNNABAA????{}NBNNS15．?dāng)?shù)列的前項(xiàng)和滿足，且成等差數(shù)列．??NANNS12NNSAA??123,1,AAA?（1）求數(shù)列的通項(xiàng)公式；??NA（2）設(shè)，求數(shù)列的前項(xiàng)和．11NNNNABSS?????NBNNT16．已知各項(xiàng)都為正數(shù)的等比數(shù)列滿足是及的等差中項(xiàng)，且{}NA312A13A22A123AAA?（Ⅰ）求數(shù)列的通項(xiàng)公式；{}NA（Ⅱ）設(shè)，且為數(shù)列的前項(xiàng)和，求數(shù)列的的前項(xiàng)和3LOGNNBA?NS{}NBN12{}NNSS?NNT17．已知數(shù)列和滿足，，（），}{NA}{NB21?A11?BNNAA21????NN（）1131211321???????NNBBNBBB???NN（1）求及；NANB（2）記數(shù)列的前項(xiàng)和為，求}{NNBANNTNT18．已知數(shù)列中，，，數(shù)列中，，其中}{NA21?ANNAA121???}{NB11??NNAB??NN（1）求證數(shù)列是等差數(shù)列；}{NB（2）設(shè)是數(shù)列的前項(xiàng)和，求NS}31{NBNNSSS11121????19．已知各項(xiàng)均為正數(shù)的數(shù)列的前項(xiàng)和為,滿足恰為??NANNS2123724,1,,NNASNAAA?????等比數(shù)列的前項(xiàng)??NB3

簡介：第1頁共2頁考研英語辭職信考研英語辭職信考研英語辭職信模板〔3〕DEARMR，EFFECTIVEOCTOBER1,IWILLASSUMETHEPOSITIONOFDIRECTOROFHUMANRESOURCESFOR,INC,INBATONROUGETHEREFORE,PLEASEACCEPTMYRESIGNATIONASBENEFITSANDCOMPENSATIONCOORDINATOROFTHEHUMANRESOURCESDEPARTMENTWITHINAAAASSOCIATES,EFFECTIVESEPTEMBER30THEDECISIONWASADIFFICULTONEFORMEBECAUSEIHAVESOENJOYEDMYWORKINGRELATIONSHIPSHERETHEJOBDESCRIPTIONHASGIVENMEGREATLATITUDEINASSISTINGOTHERCOORDINATORSWITHINTHEHUMANRESOURCEAREA,ANDASARESULT,I’VEGAINEDSKILLSINSEVERALRELATEDFIELDSTHESECROSSTRAININGOPPORTUNITIESHAVEBEENINVALUABLE,ANDINAMUCHMOREFORMAL,CLASSROOMSETTING,I’VEBEENABLETOTAKEADVANTAGEOFCLASSESINMANAGEMENT,INTERPERSONALSKILLS,WRITING,ANDORALPRESENTATIONSALLOFTHISTRAININGHASBEENAWORTHWHILEEFFORTFORBOTHAAACOMPANYANDME第2頁共2頁ASIGOTOTHENEWPOSITION,I’LLDOSOWITHTHEUTMOSTRESPECTFORTHEMANAGEMENTEAMPLESANDPHILOSOPHIESLEARNEDHEREANDWITHGRATITUDEFORTHEPERSONALATTENTIONTOMYCAREERGROWTHTHANKYOUFORTHEREWARDINGEPERIENCEI’VEENJOYEDDURINGMYSEVENYEARASSOCIATIONWITHTHEORGANIZATIONSINCERELY,

簡介：學(xué)習(xí)資料一般過去時(shí)專項(xiàng)訓(xùn)練（二）一般過去時(shí)專項(xiàng)訓(xùn)練（二）一、單項(xiàng)選擇。一、單項(xiàng)選擇。1____HE____AGOODRESTNO,HEDIDN’TADOHADBDIDHAVECDIDHADDWASHAD2WHEREISTHEMORNINGPAPERI________ITFORYOUATONCEAGETBAMGETTINGCTOGETDWILLGET3HE____VERYUPSETTHISWEEK,HE____BETTERNEXTWEEKAWILLBEISBISISCWILLBEWILLBEDISWILLBE4SHALLIBUYACUPOFTEAFORYOU____ANO,YOUWON’TBNO,YOUAREN’TCNO,PLEASEDON’TDNO,PLEASE5ASSOONASHE____,HE____TOHISFAMILYAARRIVEDWRITESBARRIVEDWROTECARRIVEDWRITTENDARRIVESWRITE6MRBLACKWASLATEBECAUSEHE____HISWAYALOSTEDBLOSECLOSESDLOST7WILLYOUPLEASESAYITAGAINI____QUITE____YOUADIDN’THEARBDON’THEARDCDIDN’THEARDDDON’THEAR8____YOU____ATSIXO’CLOCKYESTERDAYADOGETUPBDIDGETUPCDOGOTUPDDIDGOTUP學(xué)習(xí)資料9WHATDIDYOUSEE____ANOWBEVERYDAYCNOWADAYSDJUSTNOW10HEWENTINTOTHEROOMAND____THEDOORALOCKBLOCKINGCLOCKSDLOCKED二、用所給動(dòng)詞的適當(dāng)形式填空。二、用所給動(dòng)詞的適當(dāng)形式填空。1TOMANDMARY_______COMETOCHINALASTMONTH2KITTYANDBEN_______STAYATHOMEYESTERDAYTHEY_______WATCHTV3MARY_______READENGLISHYESTERDAYMORNING4THERE_______BENOONEHEREAMOMENTAGO5I_______CALLMIKETHISMORNING6ILISTENEDBUT_______HEARNOTHING7TOM_______BEGINTOLEARNCHINESELASTYEAR8LASTWEEKWE_______PICKMANYAPPLESONTHEFARM9MYMOTHER_______NOTDOHOUSEWORKYESTERDAY10SHEWATCHESTVEVERYEVENINGBUTSHE_______NOTWATCHTVLASTNIGHT11_______YOURFATHER_______GOTOWORKEVERYDAYLASTYEAR12WHATTIME_______YOU_______GETTOBEIJINGYESTERDAYWE_______GETTOBEIJINGAT900INTHEEVENING13AWEEKAGO,KITTYANDBEN_______BEINTHECOUNTRYSIDE14LASTYEARTHETEACHER_______TELLUSTHATTHEEARTHMOVESAROUNDTHESUN15THERE_______BEATELEPHONECALLFORYOUJUSTNOW