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1、高中数学数列复习试题(历年真题)若等差数列{}的前三项和且,则等于( )A.3B.4C.5D.6等差数列的前项和为若( )A.12B.10C.8D.6等差数列的前项和为若( )A.12B.10C.8D.6等差数列的前项和为若( )A.12B.10C.8D.6已知数列{}的前项和,第项满足,则( )A.B.C.D.在等比数列()中,若,,则该数列的前10项和为( )A.B.C.D.已知两个等差数列和的前项和分别为A和,且,则使得为整数的正整数的个数是( )A.2B.3C.4D.5已知成等比数列,且曲线的顶点是,则等于( )A.3B.2C.1D.已知是等差数列,,其前10项
2、和,则其公差( )A.B.C.D.等差数列{an}的前n项和为Sn,若( )A.12B.18C.24D.42等差数列{an}中,a1=1,a3+a5=14,其前n项和Sn=100,则n=( )A.9B.10C.11D.12技术官员村位于位于亚运城东部,主干道二以东石楼涌以西的地块,占地面积、m2,总建筑面积、m2,共包括地下室南区、地下室北区、地上部分1栋~12栋、服务中心、室外工程等多个单体工程。其中住宅面积m2,共12栋,1~7栋建筑层数为11层,8~12栋11层(局部复式顶层),首层局部架空,布置公建配套设施。integratedenergy,chemicalsan
3、dtextileYibincity,arethethreecorepillarsoftheindustry.In2014,thewuliangyebrandvalueto73.58billionyuan,thecity'sliquorindustrysliptostabilise.Promotingdeepdevelopmentofintegratedenergy,advancedequipmentmanufacturingindustry,changningdistrict,shalegasproductioncapacityreached277millioncubicmet
4、res,builtthecountry'sfirstindependenthigh-yieldwellsandpipelinesinthefirstsection,theleadinfactoryproductionandsupplytothepopulation.2.1-3GDPgrowthfigure2.1-4Yibin,Yibincity,Yibincity,fiscalrevenuegrowth2.1.4topographyterrainoverallisSouthwest,North-EasternState.Lowmountainsandhillsinthecity
5、landscapeasthemainridge-and-Valley,pingbasmallfragmentednaturepicturefor"waterandthesecondlandofthesevenhills".236metersto2000metersabovesealevelinthecity,lowmountain,46.6%hills45.3%,pingbaonly8.1%.2.1.5developmentofYibinlandscapesanddistinctivefeatureinthecenterofthecity,withlimitations,and
6、spatialstructureoftypicalzonalgroup,2012-citiesinbuildingwithanareaofabout76.2km2.Fromcity-buildingsituation,"oldtown-theSouthBank"Centerconstructionislaggingbehind,disintegrationoftheoldcityisslow,optimizationandupgrading,qualitypublicserviceresourcesarestillheavilyconcentratedintheoldtownt
7、ogether.SouthbankCentrehasnotbeenformed,functionsoftheserviceareaspaceismissing.Meanwhile,peripheralgroupcentresservicewasweakandinadequateaccountingforcitydevelopment,"suspicious"patterncouldnotbeformed.Asregardstransport,withtheoutwardexpansionof