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设公差为﹣3的等差数列{an}的前n项和为Sn，若S2019＝2019，则a3+a6+a9+…+a2019＝（ ）
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高三下学期数学《》真题及答案
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记等差数列前n项和为Sn若S.2＝4S.4＝20则该数列的公差d等于
2
3
6
7
记等差数列的前n项和为Sn若S2=4S4=20则该数列的公差d=
2
3
6
7
设等差数列an的前n项和为Sn若a1=-5且它的前11项的平均值是51求等差数列的公差d2求使Sn＞
设数列{an}是公差为d的等差数列.Ⅰ推导{an}的前n项和Sn公式Ⅱ证明数列是等差数列.
等差数列an的前n项和为Sn若S2=4S4=20则该数列的首项为公差为
设等差数列{an}的前n项和为Sn若首项a1=﹣3公差d=2Sk=5则正整数k=.
已知Sn为等差数列{an}的前n项的和若a2+a5=4S7=21则a7的值为.
已知公差不为0的等差数列{an}的前n项和为SnS3＝a4＋6且a1a4a13成等比数列.Ⅰ求数列{
设{an}是首项为a公差为d的等差数列d≠0Sn是其前n项和记其中c为实数 若{bn}是等
设{an}是首项为a1公差为－1的等差数列Sn为其前n项和.若S.1S.2S.4成等比数列则a1的值
设Sn是公差不为0的等差数列{an}的前n项和且S1S2S4成等比数列则等于
1
2
3
4
在等差数列{an}中若a4+a6=12Sn是数列{an}的前n项和则S9的值为
48
54
60
66
数列{an}的通项公式an＝2n＋5则此数列.
是公差为2的等差数列
是公差为5的等差数列
是首项为5的等差数列
是公差为n的等差数列
设{an}是公比为正数的等比数列a1=2a3=a2+41求{an}的通项公式;2设{bn}是首项为1
已知{an}是等差数列前n项和为Sna1＝120公差d＝－4若Sn≤ann≥2则n的最小值为
60
62
70
72
设Sn是公差不为0的等差数列{an}的前n项和且S1S2S4成等比数列则=.
设{an}是首项为a1公差为-1的等差数列Sn为其前n项和若S1S2S4成等比数列则1a的值为
已知{an}是首项为19公差为－2的等差数列Sn为{an}的前n项和.1求通项公式an及Sn2设{b
设等差数列an的前n项和为Sn若a6=S3=12则
若数列{an}中an≠0n≥1a1＝前n项和Sn满足an＝n≥2则是
首项为2、公比为
的等比数列
首项为2、公比为2的等比数列
既非等差数列也非等比数列
首项为2、公差为
的等差数列
首项为2、公差为2的等差数列
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已知a+b=3ab=2则a2+b2=
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计算5x+42-3x-3x+2
如图△ABC绕着点C顺时针旋转37°得到△A1B1C若A1B1⊥AC则∠A的度数是
观察下列各式x-1x+1=x2-1x-1x2+x+1=x3-1x-1x3+x2+x+1=x4-11填空x5-1=2根据规律可得x-1xn-1++x+1=其中n为正整数3计算3-1350+349+348++32+3+14计算-21999+-21998+-21997++-23+-22+-2+1．
WhenIwas16IreadamagazinearticleaboutamuseumcalledtheMcKayoncethehomeofawatercoloristnamedMarianMcKay．Shehadrequestedthecommunitytoturnitintoamuseumuponherdeath．OnasunnySaturdaySallyandIdroveovertothemuseum．SheaskedDoyouhavetheaddressNobutI'llrecognizeittherewasapictureinthemagazine． Ohstop．Thereitis! Themuseumwasfree．Weenteredexcited．Agroupofpeoplesittinginthehallstoppedtalkingandstaredatus． MayIhelpyouamanasked．NoIsaid．We'refine．Tourguidesgotonmynerves．Whatiftheytalkedalongtimeaboutapaintingyouweren'tthatinterestedinSallyhadgoneupstairs．Thepeopleinthehallseemedverynosy爱窥探的keepingtheireyesonmewithcuriosity．WhatwastheirproblemIsawsomenicesculpturesinoneroom．SuddenlyIsensedamanstandingbehindme．Wheredoyouthinkyouareheasked．Iturnedsharply．TheMckayArtMuseum!Hesmiledshakinghishead．SorrytheMckayisonNewBraunfelsStreet．What'sthisplaceIaskedstillconfused．Wellit'sourhome．Myheartjolted震颤．IracedtothestaircaseandcalledoutSally!Comedownimmediately! There'ssomereallygoodstuffupthere．Shesteppeddownlookingconfused．IpushedhertowardthefrontdoorwavingatthefamilysayingSorrypleaseforgiveusyouhaveareallyniceplace．OutsidewhenItoldSallywhathappenedshecoveredhermouthlaughing．Shecouldn'tbelievehowlongtheyletuslookaroundwithoutsayinganything． TherealMcKaywassplendidbutwefeltnervousthewholetimewewerethere．VanGoghPicasso．Thistimewestayedtogetherincaseanythingelseunusualhappened． Thirtyyearslaterawomanapproachedmeinapublicplace．ExcusemedidyoueverenteraresidencelongagothinkingitwastheMcKayMuseum Yes．ButhowdoyouknowWenevertoldanyone． Thatwasmyhome．Iwasateenagersittinginthehall．BeforeyoucameoverIneverrealizedwhatabeautifulplaceIlivedin．Ineverfeltluckybefore．Youthoughtitwasamuseum．Myfeelingsaboutmyhomechangedafterthat．I'vealwayswantedtothankyou． 1Howdidtheauthorfeelaboutbeingstaredatbythepeopleinthehall A．Concerned． B．Frightened． C．Puzzled． D．Delighted． 2Whydidtheauthorrefusethehelpfromthemaninthehouse A．Shedislikedpeoplewhowerenosy． B．Shefeltnervouswhentalkingtostrangers． C．Sheknewmoreaboutartthantheman． D．Shemistookhimforatourguide． 3WhydidtheauthordescribetherealMcKaymuseuminjustafewwords A．Therealmuseumlackedenoughartworktointeresther． B．Shewastooupsettospendmuchtimeattherealmuseum． C．TheMcKaywasdisappointingcomparedwiththehouse． D．Theeventhappeninginthehousewasmoresignificant． 4Whatcouldwelearnfromthelastparagraph A．Peopleshouldhavegoodtastetoenjoylife． B．Peopleshouldspendmoretimewiththeirfamily． C．Peopletendtobeblindtothebeautyaroundthem． D．Peopletendtoeducateteenagersatamuseum．
图甲是建造大桥时所用的起吊装置示意图使用电动机和滑轮组图中未画出将实心长方体A从江底竖直方向匀速吊起图乙是钢缆绳对A的拉力F1随时间t变化的图象．A完全离开水面后电动机对绳的拉力F大小为6.25×103N滑轮组的机械效率为80%已知A的重力为2×104NA上升的速度始终为0.1m/s．不计钢缆绳与滑轮间的摩擦及绳重不考虑风浪水流等因素的影响g取10N/kg求 1长方体A未露出水面时受到的浮力 2长方体A的密度 3长方体A完全离开水面后在上升过程中F的功率．
阅读下面短文根据其内容写一篇60词左右的内容概要． NowadaysanincreasingnumberofyoungChinesespendmoneybecausetheyarelazy．AccordingtoareportissuedinDecemberbyChina'se﹣commerceplatformTaobaoonChina'slazyeconomyChinesepeoplespent16billionyuanonproductsandservicesonlinein2018．Thepost﹣1995generationwasthelaziestasitsconsumptionincreasedby82percentcomparedwiththatin2017． Theso﹣calledlazyeconomyreferstoanewtypeofconsumptionofproductsandserviceswhicharedesignedtosavetimeandlabor．Accordingtothereportmanypeopleofthepost﹣1995generationbuyhigh﹣techelectronicdevicessuchasfloormoppingrobotsandautomaticwindowcleanerswhichsavethetroubleofdoinghouseholdchores．Meanwhiletake﹣outfooddeliveryservicesarealsopopularamongpeoplebomafter1995． Youngpeoplearewillingtospendmoneyonsuchproductsbecausetheywanttoenjoyhard﹣earnedleisuretimeafterabusyandstressfuldayatworkorschoolreportedGlobalTimes．Becausetheyneedtofocusontheirstudiesorjobstheseso﹣calledlazypeopletendtousetheirleisuretimemoreefficiently．ForexampleWeiDuoa21﹣year﹣oldcollegestudentisafrequentuseroftake﹣outfooddeliveryservices．Ioncehadabirthdaycakedeliveredtomyfriendwholivesfarfrommyhome．Itcostme50yuanbutitsavedmealmosthalfadaythatwouldhavebeenneededtodeliveritmyself．Myfriendwasalsohappybecauseshegottocatthecakeinstantly''WeitoldtheGlobalTimes． Whilethelazyeconomymightbeconvenientforyoungpeopleitmightalsocreateproblems．The‘lazyeconomy'oncampusisexpressedinthingslikepeoplebuyingfoodorotherthingswithoutleavingthedormitory．Asaresulttheystayintheirdormitoriesalldaylongplayingoncomputersandsmartphones．AccordingtoJinanDailythissituationcouldleadtoyoungpeoplebecominglesssociableandevendevelopingproblemsofcommunicatingwithothers．Youngpeopleshouldbealert努觉的toit．
如图所示将苹果和梨子放入水中后苹果漂浮梨子沉底．若苹果的质量体积及受到的浮力为m1V1和F1梨子的质量体积及受到的浮力为m2V2和F2现有以下判断正确的是 1若m1＞m2则F1一定小于F2 2若m1＝m2则F1一定大于F2 3若V1＝V2则F1一定小于F2 4若V1＞V2则F1一定大于F2．
运用乘法公式简便计算7002-1400×695+6952
如图甲所示电路中电源电压可调灯L1L2的额定电压均为6VL1L2的I﹣U图象如图乙所示闭合开关S逐步调大电源电压至电路允许的最大值此时
如图所示是某餐厅出现的一款餐饮机器人可以为客人送上凉菜主食等． 1送餐时机器人在1min内沿直线匀速移动了15m此过程中机器人运动的速度是多少m/s 2机器人送餐时总质量为42kg它与水平地面接触的总面积为100cm2则它对地面的压强是多少g取10N/kg
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的等比数列 首项为2、公比为2的等比数列 既非等差数列也非等比数列 首项为2、公差为
的等差数列 首项为2、公差为2的等差数列
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