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重難點(diǎn)07五種數(shù)列求和方法(核心考點(diǎn)講與練)題型一:等差等比公式法一、單選題1.(2022·山西·模擬預(yù)測(cè)(理))已知等比數(shù)列SKIPIF1<0的首項(xiàng)為1,若SKIPIF1<0成等差數(shù)列,則SKIPIF1<0的前6項(xiàng)的和為(
)A.31 B.SKIPIF1<0 C.SKIPIF1<0 D.632.(2022·福建泉州·模擬預(yù)測(cè))記等比數(shù)列{SKIPIF1<0}的前n項(xiàng)和為SKIPIF1<0.若SKIPIF1<0,則SKIPIF1<0=(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<03.(2022·山東菏澤·二模)已知數(shù)列SKIPIF1<0中,SKIPIF1<0,且對(duì)任意的m,SKIPIF1<0,都有SKIPIF1<0,則下列選項(xiàng)正確的是(
)A.SKIPIF1<0的值隨n的變化而變化 B.SKIPIF1<0C.若SKIPIF1<0,則SKIPIF1<0 D.SKIPIF1<0為遞增數(shù)列4.(2022·重慶一中高三階段練習(xí))已知等差數(shù)列SKIPIF1<0(公差不為零)和等差數(shù)列SKIPIF1<0的前n項(xiàng)和分別為SKIPIF1<0,SKIPIF1<0,如果關(guān)于x的實(shí)系數(shù)方程SKIPIF1<0有實(shí)數(shù)解,那么以下2021個(gè)方程SKIPIF1<0中,無(wú)實(shí)數(shù)解的方程最多有(
)A.1008個(gè) B.1009個(gè) C.1010個(gè) D.1011個(gè)二、多選題5.(2022·山東棗莊·三模)給出構(gòu)造數(shù)列的一種方法:在數(shù)列的每相鄰兩項(xiàng)之間插入此兩項(xiàng)的和,形成新的數(shù)列,再把所得數(shù)列按照同樣的方法不斷構(gòu)造出新的數(shù)列.現(xiàn)自1,1起進(jìn)行構(gòu)造,第1次得到數(shù)列1,2,1,第2次得到數(shù)列1,3,2,3,1,…,第SKIPIF1<0次得到數(shù)列SKIPIF1<0,記SKIPIF1<0,數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0三、填空題6.(2022·河南·模擬預(yù)測(cè)(文))設(shè)數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,已知SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0等于___________.7.(2022·山東·肥城市教學(xué)研究中心模擬預(yù)測(cè))記SKIPIF1<0為等差數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和,若SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0=_______.8.(2022·陜西·模擬預(yù)測(cè)(理))已知等差數(shù)列SKIPIF1<0公差SKIPIF1<0,其前n項(xiàng)和為SKIPIF1<0,若記數(shù)據(jù)SKIPIF1<0的方差為SKIPIF1<0,數(shù)據(jù)SKIPIF1<0的方差為SKIPIF1<0,則SKIPIF1<0___________.9.(2022·河北保定·二模)現(xiàn)有10個(gè)圓的圓心都在同一條直線上,從左到右它們的半徑依次構(gòu)成首項(xiàng)為1,公比為2的等比數(shù)列,從第2個(gè)圓開始,每個(gè)圓都與前一個(gè)圓外切,前3個(gè)圓如圖所示,若P,Q分別為第1個(gè)圓與第10個(gè)圓上任意一點(diǎn),則SKIPIF1<0的最大值為___________.(用數(shù)字作答)10.(2022·湖北·荊門市龍泉中學(xué)二模)已知數(shù)列SKIPIF1<0的通項(xiàng)公式SKIPIF1<0則SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0_____.四、解答題11.(2022·福建廈門·模擬預(yù)測(cè))已知數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)證明:數(shù)列SKIPIF1<0是等比數(shù)列;(2)記SKIPIF1<0,設(shè)SKIPIF1<0,求數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0.13.(2022·山東·肥城市教學(xué)研究中心模擬預(yù)測(cè))“學(xué)習(xí)強(qiáng)國(guó)”學(xué)習(xí)平臺(tái)的答題競(jìng)賽包括三項(xiàng)活動(dòng),分別為“四人賽”“雙人對(duì)戰(zhàn)”和“挑戰(zhàn)答題”.在一天內(nèi)參與“四人賽”活動(dòng),每局第一名積3分,第二、三名各積2分,第四名積1分,每局比賽相互獨(dú)立.在一天內(nèi)參與“雙人對(duì)戰(zhàn)”活動(dòng),每局比賽有積分,獲勝者得2分,失敗者得1分,每局比賽相互獨(dú)立.已知甲參加“四人賽”活動(dòng),每局比賽獲得第一名、第二名的概率均為SKIPIF1<0,獲得第四名的概率為SKIPIF1<0;甲參加“雙人對(duì)戰(zhàn)”活動(dòng),每局比賽獲勝的概率為SKIPIF1<0.(1)記甲在一天中參加“四人賽”和“雙人對(duì)戰(zhàn)”兩項(xiàng)活動(dòng)(兩項(xiàng)活動(dòng)均只參加一局)的總得分為SKIPIF1<0,求SKIPIF1<0的分布列與數(shù)學(xué)期望;(2)“挑戰(zhàn)答題”比賽規(guī)則如下:每位參賽者每次連續(xù)回答5道題,在答對(duì)的情況下可以持續(xù)答題,若第一次答錯(cuò)時(shí),答題結(jié)束,積分為0分,只有全部答對(duì)5道題可以獲得5個(gè)積分.某市某部門為了吸引更多職工參與答題,設(shè)置了一個(gè)“得積分進(jìn)階”活動(dòng),從1階到SKIPIF1<0SKIPIF1<0階,規(guī)定每輪答題獲得5個(gè)積分進(jìn)2階,沒(méi)有獲得積分進(jìn)1階,按照獲得的階級(jí)給予相應(yīng)的獎(jiǎng)品,記乙每次獲得5個(gè)積分的概率互不影響,均為SKIPIF1<0,記乙進(jìn)到SKIPIF1<0階的概率為SKIPIF1<0,求SKIPIF1<0.14.(2022·遼寧·東北育才學(xué)校二模)已知等比數(shù)列SKIPIF1<0和遞增的等差數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0和數(shù)列SKIPIF1<0的通項(xiàng)公式;(2)數(shù)列SKIPIF1<0和數(shù)列SKIPIF1<0中的所有項(xiàng)分別構(gòu)成集合SKIPIF1<0和SKIPIF1<0,將SKIPIF1<0的所有元素按從小到大依次排列構(gòu)成一個(gè)新數(shù)列SKIPIF1<0,求數(shù)列SKIPIF1<0前63項(xiàng)和SKIPIF1<0.15.(2022·山東菏澤·二模)已知數(shù)列SKIPIF1<0中SKIPIF1<0,它的前n項(xiàng)和SKIPIF1<0滿足SKIPIF1<0.(1)證明:數(shù)列SKIPIF1<0為等比數(shù)列;(2)求SKIPIF1<0.題型二:裂項(xiàng)相消法一、單選題1.(2022·四川省瀘縣第二中學(xué)模擬預(yù)測(cè)(文))已知等差數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.若對(duì)任意SKIPIF1<0且SKIPIF1<0,總有SKIPIF1<0恒成立,則實(shí)數(shù)SKIPIF1<0的最小值為(
)A.1 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0二、多選題2.(2022·山東·濟(jì)南一中高三階段練習(xí))如圖所示,這是小朋友們喜歡玩的彩虹塔疊疊樂(lè)玩具,某數(shù)學(xué)興趣小組利用該玩具制定如下玩法:在2號(hào)桿中自下而上串有由大到小的SKIPIF1<0個(gè)彩虹圈,將2號(hào)桿中的彩虹圈全部移動(dòng)到1號(hào)桿上,3號(hào)桿可以作為過(guò)渡使用;每次只能移動(dòng)一個(gè)彩虹圈,且無(wú)論在哪個(gè)桿上,小的彩虹圈必須放置在大的上方;將一個(gè)彩虹圈從一個(gè)桿移動(dòng)到另一桿上記為移動(dòng)1次,記SKIPIF1<0為2號(hào)桿中n個(gè)彩虹圈全部移動(dòng)到1號(hào)桿所需要的最少移動(dòng)次數(shù),設(shè)SKIPIF1<0.下面結(jié)論正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<03.(2022·全國(guó)·模擬預(yù)測(cè))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,則(
)A.SKIPIF1<0 B.?dāng)?shù)列SKIPIF1<0是等差數(shù)列C.?dāng)?shù)列SKIPIF1<0是等差數(shù)列 D.?dāng)?shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0三、填空題4.(2022·湖北·蘄春縣實(shí)驗(yàn)高級(jí)中學(xué)高二期中)高斯函數(shù)SKIPIF1<0也稱為取整函數(shù),其中SKIPIF1<0表示不超過(guò)x的最大整數(shù),例如SKIPIF1<0.已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,設(shè)數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,則SKIPIF1<0______.四、解答題5.(2022·重慶一中高三階段練習(xí))已知數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,點(diǎn)SKIPIF1<0在直線SKIPIF1<0上SKIPIF1<0.(1)求數(shù)列SKIPIF1<0的通項(xiàng)公式;(2)記SKIPIF1<0,數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,求使得SKIPIF1<0成立的SKIPIF1<0的最大值.6.(2022·江西·模擬預(yù)測(cè)(理))各項(xiàng)都為正數(shù)的單調(diào)遞增數(shù)列{an}的前n項(xiàng)和為Sn,且滿足SKIPIF1<0(n∈N*).(1)求數(shù)列{an}的通項(xiàng)公式;(2)求SKIPIF1<0;(3)設(shè)SKIPIF1<0SKIPIF1<0,數(shù)列SKIPIF1<0的前n項(xiàng)和為Pn,求使Pn>46成立的n的最小值.7.(2022·江蘇鹽城·三模)已知正項(xiàng)等比數(shù)列SKIPIF1<0滿足SKIPIF1<0,請(qǐng)?jiān)冖賁KIPIF1<0,②SKIPIF1<0,③SKIPIF1<0,SKIPIF1<0,SKIPIF1<0中選擇一個(gè)填在橫線上并完成下面問(wèn)題:(1)求SKIPIF1<0的通項(xiàng)公式;(2)設(shè)SKIPIF1<0,SKIPIF1<0的前SKIPIF1<0和為SKIPIF1<0,求證:SKIPIF1<0.8.(2022·江西九江·三模(文))已知數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,且滿足SKIPIF1<0,SKIPIF1<0.(1)求SKIPIF1<0;(2)求數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和.9.(2022·山東棗莊·三模)已知正項(xiàng)數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,且SKIPIF1<0、SKIPIF1<0、SKIPIF1<0成等比數(shù)列,其中SKIPIF1<0.(1)求數(shù)列SKIPIF1<0的通項(xiàng)公式;(2)設(shè)SKIPIF1<0,求數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0.10.(2022·浙江·模擬預(yù)測(cè))已知遞增的等差數(shù)列SKIPIF1<0滿足:SKIPIF1<0,且SKIPIF1<0成等比數(shù)列.?dāng)?shù)列SKIPIF1<0滿足:SKIPIF1<0,其中SKIPIF1<0為SKIPIF1<0的前n項(xiàng)和.(1)求數(shù)列SKIPIF1<0的通項(xiàng)公式;(2)設(shè)SKIPIF1<0為數(shù)列SKIPIF1<0的前n項(xiàng)和,是否存在實(shí)數(shù)SKIPIF1<0,使得不等式SKIPIF1<0對(duì)一切SKIPIF1<0恒成立?若存在,求出SKIPIF1<0的值;若不存在,說(shuō)明理由.11.(2022·河南·高二期中(文))已知正項(xiàng)等比數(shù)列SKIPIF1<0的公比大于1,其前n項(xiàng)和為SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0的通項(xiàng)公式;(2)設(shè)數(shù)列SKIPIF1<0,SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,求數(shù)列SKIPIF1<0的前n項(xiàng)和SKIPIF1<0.12.(2022·天津和平·二模)已知數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0滿足SKIPIF1<0.數(shù)列SKIPIF1<0滿足SKIPIF1<0,且満足SKIPIF1<0(1)求數(shù)列SKIPIF1<0,SKIPIF1<0的通項(xiàng)公式;(2)若數(shù)列SKIPIF1<0滿足SKIPIF1<0;求SKIPIF1<0(3)SKIPIF1<0,數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,求證:SKIPIF1<0.題型三:錯(cuò)位相減法一、單選題1.(2022·江西鷹潭·二模(理))若正整數(shù)SKIPIF1<0、SKIPIF1<0只有SKIPIF1<0為公約數(shù),則稱SKIPIF1<0、SKIPIF1<0互質(zhì).對(duì)于正整數(shù)SKIPIF1<0,SKIPIF1<0是小于或等于SKIPIF1<0的正整數(shù)中與SKIPIF1<0互質(zhì)的數(shù)的個(gè)數(shù).函數(shù)SKIPIF1<0以其首名研究者歐拉命名,稱為歐拉函數(shù),例如:SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則下列說(shuō)法正確的是(
)A.SKIPIF1<0B.?dāng)?shù)列SKIPIF1<0是等差數(shù)列C.SKIPIF1<0D.?dāng)?shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,則SKIPIF1<02.(2022·廣東·三模)在數(shù)學(xué)和許多分支中都能見到很多以瑞士數(shù)學(xué)家歐拉命名的常數(shù)?公式和定理,如:歐拉函數(shù)SKIPIF1<0(SKIPIF1<0)的函數(shù)值等于所有不超過(guò)正整數(shù)n且與n互素的正整數(shù)的個(gè)數(shù),(互素是指兩個(gè)整數(shù)的公約數(shù)只有1),例如:SKIPIF1<0;SKIPIF1<0(與3互素有1?2);SKIPIF1<0(與9互素有1?2?4?5?7?8).記SKIPIF1<0為數(shù)列SKIPIF1<0的前n項(xiàng)和,則SKIPIF1<0=(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.(2022·江西·二模(理))記數(shù)列SKIPIF1<0中不超過(guò)正整數(shù)n的項(xiàng)的個(gè)數(shù)為SKIPIF1<0,設(shè)數(shù)列SKIPIF1<0的前n項(xiàng)的和為SKIPIF1<0,則SKIPIF1<0SKIPIF1<0等于(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0二、多選題4.(2022·廣東·高三階段練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<05.(2022·全國(guó)·模擬預(yù)測(cè))記數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,數(shù)列SKIPIF1<0為SKIPIF1<0,….其構(gòu)造方法是:首先給出SKIPIF1<0,接著復(fù)制該項(xiàng)SKIPIF1<0后,再添加其后繼數(shù)SKIPIF1<0,于是,得SKIPIF1<0;然后再?gòu)?fù)制前面所有的項(xiàng)SKIPIF1<0,再添加SKIPIF1<0的后繼數(shù)SKIPIF1<0于是,得SKIPIF1<0;接下來(lái)再?gòu)?fù)制前面所有的項(xiàng)SKIPIF1<0,再添加SKIPIF1<0的后繼數(shù)SKIPIF1<0于是,得前SKIPIF1<0項(xiàng)為SKIPIF1<0.如此繼續(xù)下去,則使不等式SKIPIF1<0成立的SKIPIF1<0的值不可能為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<06.(2021·江蘇·高三階段練習(xí))設(shè)SKIPIF1<0和SKIPIF1<0分別為數(shù)列SKIPIF1<0和SKIPIF1<0的前n項(xiàng)和.已知SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0是等比數(shù)列 B.SKIPIF1<0是遞增數(shù)列C.SKIPIF1<0 D.SKIPIF1<0三、填空題7.(2022·山東聊城·二模)已知數(shù)列SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,則數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)的和為______.8.(2022·內(nèi)蒙古赤峰·模擬預(yù)測(cè)(理))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0______.9.(2022·天津市第四中學(xué)模擬預(yù)測(cè))已知等比數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,公比SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,數(shù)列SKIPIF1<0滿足SKIPIF1<0且SKIPIF1<0,SKIPIF1<0.(1)則SKIPIF1<0___________;SKIPIF1<0___________;(2)將SKIPIF1<0和SKIPIF1<0中的所有項(xiàng)按從小到大的順序排列組成新數(shù)列SKIPIF1<0,則數(shù)列SKIPIF1<0的前50項(xiàng)和SKIPIF1<0___________;(3)設(shè)數(shù)列SKIPIF1<0的通項(xiàng)公式為:SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0___________.四、解答題10.(2022·浙江·效實(shí)中學(xué)模擬預(yù)測(cè))已知等差數(shù)列SKIPIF1<0中,公差SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是SKIPIF1<0與SKIPIF1<0的等比中項(xiàng),設(shè)數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,滿足SKIPIF1<0.(1)求數(shù)列SKIPIF1<0與SKIPIF1<0的通項(xiàng)公式;(2)設(shè)SKIPIF1<0,數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,若SKIPIF1<0對(duì)任意的SKIPIF1<0恒成立,求實(shí)數(shù)SKIPIF1<0的取值范圍.11.(2022·全國(guó)·高三階段練習(xí)(理))已知數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0成等差數(shù)列.(1)求數(shù)列SKIPIF1<0的通項(xiàng)公式;(2)設(shè)SKIPIF1<0,求數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0.12.(2022·山東臨沂·二模)已知數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)求SKIPIF1<0的通項(xiàng)公式;(2)記SKIPIF1<0,求數(shù)列SKIPIF1<0的前n項(xiàng)和SKIPIF1<0.13.(2022·山西·模擬預(yù)測(cè)(文))已知數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,且SKIPIF1<0.(1)證明SKIPIF1<0是等比數(shù)列;(2)求SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0.14.(2022·天津·一模)已知數(shù)列SKIPIF1<0是等差數(shù)列,其前n項(xiàng)和為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0;數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0,SKIPIF1<0的通項(xiàng)公式;(2)求數(shù)列SKIPIF1<0的前n項(xiàng)和SKIPIF1<0;(3)求證:SKIPIF1<0.題型四:分組(幷項(xiàng))求和法一、單選題1.(2022·全國(guó)·高三專題練習(xí))已知數(shù)列SKIPIF1<0是以1為首項(xiàng),2為公差的等差數(shù)列,數(shù)列SKIPIF1<0是以1為首項(xiàng),2為公比的等比數(shù)列,設(shè)SKIPIF1<0,SKIPIF1<0,則當(dāng)SKIPIF1<0時(shí),SKIPIF1<0的最大值是(
).A.9 B.10 C.11 D.122.(2022·江蘇南京·高三開學(xué)考試)若(2x+1)(22x+1)(23x+1)…(2nx+1)=a0+a1x+a2x2+…+anxn(n∈N*),則下列說(shuō)法正確的是(
)A.a(chǎn)n=2SKIPIF1<0(n∈N*)B.{SKIPIF1<0-1}(n∈N*)為等差數(shù)列C.設(shè)bn=a1,則數(shù)列SKIPIF1<0為等差數(shù)列D.設(shè)bn=a1,則數(shù)列{bn}的前n項(xiàng)的和為SKIPIF1<03.(2022·河北·模擬預(yù)測(cè))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0(SKIPIF1<0,SKIPIF1<0),SKIPIF1<0是數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和,則SKIPIF1<0(
)A.508 B.506 C.1011 D.1009二、多選題4.(2022·河北滄州·模擬預(yù)測(cè))已知數(shù)列SKIPIF1<0的通項(xiàng)公式為SKIPIF1<0,SKIPIF1<0是數(shù)列SKIPIF1<0的前n項(xiàng)和,若SKIPIF1<0,使SKIPIF1<0,則SKIPIF1<0(
)A.1 B.2 C.3 D.45.(2021·廣東·新會(huì)陳經(jīng)綸中學(xué)高三階段練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.?dāng)?shù)列SKIPIF1<0是等比數(shù)列6.(2022·江蘇·蘇州中學(xué)高三開學(xué)考試)在數(shù)列SKIPIF1<0中,SKIPIF1<0,前n項(xiàng)的和為Sn,則(
)A.SKIPIF1<0的最大值為1 B.?dāng)?shù)列SKIPIF1<0是等差數(shù)列C.?dāng)?shù)列SKIPIF1<0是等差數(shù)列 D.SKIPIF1<0三、填空題7.(2022·云南昆明·模擬預(yù)測(cè)(理))記數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,則SKIPIF1<0__________.8.(2022·新疆·三模(理))設(shè)SKIPIF1<0為數(shù)列SKIPIF1<0的前n項(xiàng)和,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0___________.9.(2022·云南昆明·模擬預(yù)測(cè)(文))數(shù)列SKIPIF1<0的前10項(xiàng)和等于___________.四、解答題10.(2022·河北滄州·模擬預(yù)測(cè))已知數(shù)列SKIPIF1<0,滿足SKIPIF1<0.(1)證明SKIPIF1<0是等比數(shù)列,并求SKIPIF1<0的通項(xiàng)公式;(2)設(shè)數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,證明:SKIPIF1<0.11.(2023·福建漳州·三模)已知等差數(shù)列{SKIPIF1<0}的前n項(xiàng)和為SKIPIF1<0,且SKIPIF1<0(1)求{SKIPIF1<0}的通項(xiàng)公式:(2)若數(shù)列SKIPIF1<0滿足SKIPIF1<0,求SKIPIF1<0的前10項(xiàng)和.12.(2022·江蘇連云港·模擬預(yù)測(cè))已知數(shù)列SKIPIF1<0是遞增的等差數(shù)列,SKIPIF1<0是各項(xiàng)均為正數(shù)的等比數(shù)列SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0和SKIPIF1<0的通項(xiàng)公式;(2)設(shè)SKIPIF1<0,求數(shù)列SKIPIF1<0的前9項(xiàng)的和SKIPIF1<0.(注:SKIPIF1<0表示不超過(guò)x的最大整數(shù))13.(2022·河南洛陽(yáng)·三模(理))已知正項(xiàng)數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,數(shù)列SKIPIF1<0滿足SKIPIF1<0且SKIPIF1<0.(1)求數(shù)列SKIPIF1<0,SKIPIF1<0的通項(xiàng)公式;(2)求數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0.14.(2022·湖北·荊門市龍泉中學(xué)二模)已知數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,且SKIPIF1<0(1)求數(shù)列SKIPIF1<0的通項(xiàng)公式;(2)SKIPIF1<0,求數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和SKIPIF1<0;15.(2022·山東濱州·二模)已知公差為d的等差數(shù)列SKIPIF1<0和公比SKIPIF1<0的等比數(shù)列SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0和SKIPIF1<0的通項(xiàng)公式;(2)令SKIPIF1<0,抽去數(shù)列SKIPIF1<0的第3項(xiàng)、第6項(xiàng)、第9項(xiàng)、……、第3n項(xiàng)、……余下的項(xiàng)的順序不變,構(gòu)成一個(gè)新數(shù)列SKIPIF1<0,求數(shù)列SKIPIF1<0的前n項(xiàng)和SKIPIF1<0.題型五:倒序相加法一、單選題1.(2022·湖南岳陽(yáng)·二模)德國(guó)數(shù)學(xué)家高斯是近代數(shù)學(xué)奠基者之一,有“數(shù)學(xué)王子”之稱,在歷史上有很大的影響.他幼年時(shí)就表現(xiàn)出超人的數(shù)學(xué)天賦,10歲時(shí),他在進(jìn)行SKIPIF1<0的求和運(yùn)算時(shí),就提出了倒序相加法的原理,該原理基于所給數(shù)據(jù)前后對(duì)應(yīng)項(xiàng)的和呈現(xiàn)一定的規(guī)律生成,因此,此方法也稱之為高斯算法.已知某數(shù)列通項(xiàng)SKIPIF1<0,則SKIPIF1<0(
)A.98 B.99 C.100 D.1012.(2022·浙江·高三專題練習(xí))已知數(shù)列SKIPIF1<0滿足對(duì)SKIPIF1<0、SKIPIF1<0,都有SKIPIF1<0成立,SKIPIF1<0,函數(shù)SKIPIF1<0,記SKIPIF1<0,則數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.(2022·全國(guó)·高三專題練習(xí))對(duì)于函數(shù)SKIPIF1<0,SKIPIF1<0時(shí),SKIPIF1<0,則函數(shù)SKIPIF1<0的圖象關(guān)于點(diǎn)SKIPIF1<0成中心對(duì)稱.探究函數(shù)SKIPIF1<0圖象的對(duì)稱中心,并利用它求SKIPIF1<0的值為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<04.(2022·全國(guó)·高三專題練習(xí))在進(jìn)行SKIPIF1<0的求和運(yùn)算時(shí),德國(guó)大數(shù)學(xué)家高斯提出了倒序相加法的原理,該原理基于所給數(shù)據(jù)前后對(duì)應(yīng)項(xiàng)的和呈現(xiàn)一定的規(guī)律生成,因此,此方法也稱之為高斯算法.已知數(shù)列SKIPIF1<0滿足SKIPIF1<0SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0二、多選題5.(2022·全國(guó)·高三專題練習(xí))定義SKIPIF1<0是SKIPIF1<0的導(dǎo)函數(shù)SKIPIF1<0的導(dǎo)函數(shù),若方程SKIPIF1<0有實(shí)數(shù)解SKIPIF1<0,則稱點(diǎn)SKIPIF1<0為函數(shù)SKIPIF1<0的“拐點(diǎn)”.可以證明,任意三次函數(shù)SKIPIF1<0都有“拐點(diǎn)”和對(duì)稱中心,且“拐點(diǎn)”就是其對(duì)稱中心,請(qǐng)你根據(jù)這一結(jié)論判斷下列命題,其中正確命題是(
)A.存在有兩個(gè)及兩個(gè)以上對(duì)稱中心的三次函數(shù)B.函數(shù)SKIPIF1<0的對(duì)稱中心也是函數(shù)SKIPIF1<0的一個(gè)對(duì)稱中心C.存在三次函數(shù)SKIPIF1<0,方程SKIPIF1<0有實(shí)數(shù)解SKIPIF1<0,且點(diǎn)SKIPIF1<0
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