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答案第=page11頁,共=sectionpages22頁專題15數(shù)列的求和方法和不等式問題【練基礎(chǔ)】單選題1.(2021·北京海淀·統(tǒng)考模擬預(yù)測)已知數(shù)列SKIPIF1<0若SKIPIF1<0,SKIPIF1<0,則該數(shù)列的前六項和為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<02.(2022秋·安徽滁州·高三??计谥校┤魯?shù)列SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的前2022項和為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.(2022秋·四川成都·高三樹德中學(xué)校考開學(xué)考試)已知數(shù)列SKIPIF1<0的前n項和SKIPIF1<0滿足SKIPIF1<0,若數(shù)列SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<04.(2022秋·河南洛陽·高三孟津縣第一高級中學(xué)??茧A段練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(
)A.2021 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<05.(2022·安徽滁州·??寄M預(yù)測)已知數(shù)列SKIPIF1<0的首項SKIPIF1<0,且滿足SKIPIF1<0,記數(shù)列SKIPIF1<0的前n項和為SKIPIF1<0,若對于任意SKIPIF1<0,不等式SKIPIF1<0恒成立,則實數(shù)SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<06.(2022·廣東廣州·校聯(lián)考三模)已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則數(shù)列SKIPIF1<0的前2022項和為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<07.(2022·全國·高三專題練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,則下列有可能成立的是(
)A.若SKIPIF1<0為等比數(shù)列,則SKIPIF1<0B.若SKIPIF1<0為遞增的等差數(shù)列,則SKIPIF1<0C.若SKIPIF1<0為等比數(shù)列,則SKIPIF1<0D.若SKIPIF1<0為遞增的等差數(shù)列,則SKIPIF1<08.(2023春·廣東揭陽·高三??茧A段練習(xí))我國古代數(shù)學(xué)著作《九章算術(shù)》中有如下問題:“今有人持金出五關(guān),前關(guān)二稅一,次關(guān)三而稅一,次關(guān)四而稅一,次關(guān)五而稅一,次關(guān)六而稅一,并五關(guān)所稅,適重一斤.問本持金幾何?”其意思為“今有人持金出五關(guān),第1關(guān)收稅金為持金的SKIPIF1<0,第2關(guān)收稅金為剩余金的SKIPIF1<0,第3關(guān)收稅金為剩余金的SKIPIF1<0,第4關(guān)收稅金為剩余金的SKIPIF1<0,第5關(guān)收稅金為剩余金的SKIPIF1<0,5關(guān)所收稅金之和恰好重1斤.問原來持金多少?”.記這個人原來持金為SKIPIF1<0斤,設(shè)SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.7 C.13 D.26二、多選題9.(2022秋·江蘇鎮(zhèn)江·高三揚中市第二高級中學(xué)??计谀?shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則下列說法正確的是(
)A.若SKIPIF1<0且SKIPIF1<0,數(shù)列SKIPIF1<0單調(diào)遞減B.若存在無數(shù)個自然數(shù)SKIPIF1<0,使得SKIPIF1<0,則SKIPIF1<0C.當(dāng)SKIPIF1<0或SKIPIF1<0時,SKIPIF1<0的最小值不存在D.當(dāng)SKIPIF1<0時,SKIPIF1<010.(2022·湖北黃岡·黃岡中學(xué)校考三模)已知正項數(shù)列SKIPIF1<0的前SKIPIF1<0項和為SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0,數(shù)列SKIPIF1<0的前SKIPIF1<0項和為SKIPIF1<0,則下列結(jié)論正確的是(
)A.SKIPIF1<0是等差數(shù)列B.SKIPIF1<0C.SKIPIF1<0D.滿足SKIPIF1<0的SKIPIF1<0的最小正整數(shù)解為SKIPIF1<011.(2023·全國·高三專題練習(xí))已知數(shù)列SKIPIF1<0滿足,SKIPIF1<0,則下列說法正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<012.(2022·全國·模擬預(yù)測)已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的前n項和為SKIPIF1<0,則下列說法正確的有(
)A.對任意SKIPIF1<0,SKIPIF1<0不可能為常數(shù)數(shù)列B.當(dāng)SKIPIF1<0時,SKIPIF1<0為遞減數(shù)列C.若SKIPIF1<0,則SKIPIF1<0D.若SKIPIF1<0,則SKIPIF1<0三、填空題13.(2022·全國·高三專題練習(xí))若數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則其前SKIPIF1<0項和為___________.14.(2022·全國·高三專題練習(xí))已知正項數(shù)列SKIPIF1<0滿足SKIPIF1<0,則數(shù)列SKIPIF1<0的前n項和為___________.15.(2022秋·福建福州·高三福建省福州格致中學(xué)校考階段練習(xí))設(shè)函數(shù)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.則數(shù)列SKIPIF1<0的前n項和SKIPIF1<0______.16.(2023·全國·高三專題練習(xí))已知函數(shù)SKIPIF1<0,點O為坐標原點,點SKIPIF1<0,向量SKIPIF1<0,SKIPIF1<0是向量SKIPIF1<0與SKIPIF1<0的夾角,則SKIPIF1<0的值為______.四、解答題17.(2023·全國·高三專題練習(xí))記數(shù)列SKIPIF1<0的前n項和為SKIPIF1<0,且SKIPIF1<0.(1)求數(shù)列SKIPIF1<0的通項公式;(2)設(shè)m為整數(shù),且對任意SKIPIF1<0,SKIPIF1<0,求m的最小值.18.(2023·河南·校聯(lián)考模擬預(yù)測)已知數(shù)列SKIPIF1<0滿足對任意m,SKIPIF1<0都有SKIPIF1<0,數(shù)列SKIPIF1<0是等比數(shù)列,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0,SKIPIF1<0的通項公式;(2)設(shè)SKIPIF1<0,求數(shù)列SKIPIF1<0的前n項和SKIPIF1<0.19.(2023·全國·模擬預(yù)測)已知數(shù)列SKIPIF1<0的前n項和為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0是公差為1的等差數(shù)列.(1)求SKIPIF1<0的通項公式;(2)證明:SKIPIF1<0.20.(2023·全國·模擬預(yù)測)已知數(shù)列SKIPIF1<0的前n項和為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)求數(shù)列SKIPIF1<0的通項公式;(2)設(shè)SKIPIF1<0,數(shù)列SKIPIF1<0的前n項和為SKIPIF1<0,求SKIPIF1<0的取值范圍.【提能力】一、單選題21.(2020·全國·高三專題練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0.設(shè)SKIPIF1<0,SKIPIF1<0為數(shù)列SKIPIF1<0的前SKIPIF1<0項和.若SKIPIF1<0(常數(shù)),SKIPIF1<0,則SKIPIF1<0的最小值是A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<022.(2022·全國·高三專題練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0…SKIPIF1<0,設(shè)數(shù)列SKIPIF1<0滿足:SKIPIF1<0,數(shù)列SKIPIF1<0的前SKIPIF1<0項和為SKIPIF1<0,若SKIPIF1<0恒成立,則SKIPIF1<0的取值范圍是A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<023.(2022·河南·統(tǒng)考一模)已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,則數(shù)列SKIPIF1<0的前40項和SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<024.(2022·全國·高三專題練習(xí))已知等比數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,若SKIPIF1<0,SKIPIF1<0是數(shù)列SKIPIF1<0的前SKIPIF1<0項和,對任意SKIPIF1<0,不等式SKIPIF1<0恒成立,則實數(shù)SKIPIF1<0的取值范圍為(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<025.(2022·全國·高三專題練習(xí))已知等比數(shù)列SKIPIF1<0的前n項和為SKIPIF1<0,記SKIPIF1<0,若數(shù)列SKIPIF1<0也為等比數(shù)列,則SKIPIF1<0(
)A.12 B.32 C.SKIPIF1<0 D.SKIPIF1<0二、多選題26.(2023·遼寧盤錦·盤錦市高級中學(xué)??家荒#┮阎獢?shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為數(shù)列SKIPIF1<0的前n項和,則下列說法正確的有(
)A.n為偶數(shù)時,SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0的最大值為2027.(2022·福建福州·福州三中校考模擬預(yù)測)已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則(
)A.SKIPIF1<0是遞減數(shù)列 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<028.(2022·全國·高三專題練習(xí))已知數(shù)列SKIPIF1<0的通項公式為SKIPIF1<0,SKIPIF1<0是數(shù)列SKIPIF1<0的前n項和,若SKIPIF1<0,使SKIPIF1<0,則SKIPIF1<0(
)A.1 B.2 C.3 D.429.(2021·湖北武漢·武漢市黃陂區(qū)第一中學(xué)校考模擬預(yù)測)設(shè)數(shù)列SKIPIF1<0的前SKIPIF1<0項和為SKIPIF1<0,若存在實數(shù)SKIPIF1<0,使得對任意SKIPIF1<0,都有SKIPIF1<0,則稱數(shù)列SKIPIF1<0為“SKIPIF1<0數(shù)列”.則以下結(jié)論正確的是(
)A.若SKIPIF1<0是等差數(shù)列,且SKIPIF1<0,公差SKIPIF1<0,則數(shù)列SKIPIF1<0是“SKIPIF1<0數(shù)列”B.若SKIPIF1<0是等比數(shù)列,且公比SKIPIF1<0滿足SKIPIF1<0,則數(shù)列SKIPIF1<0是“SKIPIF1<0數(shù)列”C.若SKIPIF1<0,則數(shù)列SKIPIF1<0是“SKIPIF1<0數(shù)列”D.若SKIPIF1<0,則數(shù)列SKIPIF1<0是“SKIPIF1<0數(shù)列三、填空題30.(2022·山東濰坊·昌樂二中校考模擬預(yù)測)已知向量SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0______.31.(2023·全國·高三專題練習(xí))數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0前40項和為________.32.(2021秋·黑龍江鶴崗·高三鶴崗一中??茧A段練習(xí))設(shè)SKIPIF1<0為數(shù)列SKIPIF1<0的前SKIPIF1<0項和,滿足SKIPIF1<0,SKIPIF1<0,其中SKIPIF1<0,數(shù)列SKIPIF1<0的前SKIPIF1<0項和為SKIPIF1<0,滿足SKIPIF1<0,則SKIPIF1<0___________.33.(2022·全國·高三專題練習(xí))已知SKIPIF1<0,函數(shù)SKIPIF1<0在SKIPIF1<0有極值,設(shè)SKIPIF1<0,其中SKIPIF1<0為不大于SKIPIF1<0的最大整數(shù),記數(shù)列SKIPIF1<0的前SKIPIF1<0項和為SKIPIF1<0,則SKIPIF1<0___________.四、解答題34.(2023·山西臨汾·統(tǒng)考一模)已知數(shù)列SKIPIF1<0,SKIPIF1<0,滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(1)證明SKIPIF1<0是等比數(shù)列,并求SKIPIF1<0的通項公式;(2)設(shè)SKIPIF1<0,證明:SKIPIF1<0.35.(2022·全國·統(tǒng)考高考真題)已知函數(shù)SKIPIF1<0.(1)當(dāng)SKIPIF1<0時,討論SKIPIF1
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