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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
