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鞏固練習(xí)06數(shù)列中的復(fù)雜遞推式問(wèn)題【秒殺總結(jié)】1、疊加法:SKIPIF1<0;2、疊乘法:SKIPIF1<0;3、構(gòu)造法(等差,等比):①形如SKIPIF1<0(其中SKIPIF1<0均為常數(shù)SKIPIF1<0)的遞推公式,SKIPIF1<0,其中SKIPIF1<0,構(gòu)造SKIPIF1<0,即SKIPIF1<0是以SKIPIF1<0為首項(xiàng),SKIPIF1<0為公比的等比數(shù)列.②形如SKIPIF1<0(其中SKIPIF1<0均為常數(shù),SKIPIF1<0),可以在遞推公式兩邊同除以SKIPIF1<0,轉(zhuǎn)化為SKIPIF1<0型.③形如SKIPIF1<0,可通過(guò)取倒數(shù)轉(zhuǎn)化為等差數(shù)列求通項(xiàng).4、取對(duì)數(shù)法:SKIPIF1<0.5、由SKIPIF1<0和SKIPIF1<0的關(guān)系求數(shù)列通項(xiàng)(1)利用SKIPIF1<0,化SKIPIF1<0為SKIPIF1<0.(2)當(dāng)SKIPIF1<0不易消去,或消去SKIPIF1<0后SKIPIF1<0不易求,可先求SKIPIF1<0,再由SKIPIF1<0求SKIPIF1<0.6、數(shù)列求和:(1)錯(cuò)位相減法:適用于一個(gè)等差數(shù)列和一個(gè)等比數(shù)列(公比不等于1)對(duì)應(yīng)項(xiàng)相乘構(gòu)成的數(shù)列求和SKIPIF1<0型(2)倒序相加法(3)裂項(xiàng)相消法??碱}型數(shù)列的通項(xiàng)公式裂項(xiàng)方法等差數(shù)列型SKIPIF1<0SKIPIF1<0是公差為SKIPIF1<0的等差數(shù)列SKIPIF1<0SKIPIF1<0SKIPIF1<0是公差為SKIPIF1<0的等差數(shù)列SKIPIF1<0無(wú)理型SKIPIF1<0SKIPIF1<0指數(shù)型SKIPIF1<0SKIPIF1<0對(duì)數(shù)型SKIPIF1<0SKIPIF1<0三角型SKIPIF1<0SKIPIF1<0是公差為SKIPIF1<0的等差數(shù)列SKIPIF1<0階乘型SKIPIF1<0SKIPIF1<0【典型例題】例1.已知數(shù)列SKIPIF1<0滿足SKIPIF1<0且SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0的值是SKIPIF1<0SKIPIF1<0A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0例2.已知數(shù)列SKIPIF1<0的通項(xiàng)公式為SKIPIF1<0,其前SKIPIF1<0項(xiàng)和為SKIPIF1<0,則在數(shù)列SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0中,有理數(shù)項(xiàng)的項(xiàng)數(shù)為SKIPIF1<0SKIPIF1<0A.42 B.43 C.44 D.45例3.對(duì)于SKIPIF1<0,SKIPIF1<0.例4.設(shè)曲線SKIPIF1<0在點(diǎn)SKIPIF1<0處的切線與SKIPIF1<0軸的交點(diǎn)的橫坐標(biāo)為SKIPIF1<0,則SKIPIF1<0的值為.例5.在數(shù)1和2之間插入SKIPIF1<0個(gè)正數(shù),使得這SKIPIF1<0個(gè)數(shù)構(gòu)成遞增等比數(shù)列,將這SKIPIF1<0個(gè)數(shù)的乘積記為SKIPIF1<0,令SKIPIF1<0,SKIPIF1<0.(1)數(shù)列SKIPIF1<0的通項(xiàng)公式為SKIPIF1<0;(2)SKIPIF1<0.例6.?dāng)?shù)列SKIPIF1<0中,SKIPIF1<0,若不等式SKIPIF1<0恒成立,則實(shí)數(shù)SKIPIF1<0的取值范圍是.【過(guò)關(guān)測(cè)試】一、單選題1.(2023·江西景德鎮(zhèn)·統(tǒng)考模擬預(yù)測(cè))斐波那契數(shù)列SKIPIF1<0滿足SKIPIF1<0,SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0(
)A.2022 B.2023 C.2024 D.20252.(2023·全國(guó)·模擬預(yù)測(cè))1678年德國(guó)著名數(shù)學(xué)家萊布尼茲為了滿足計(jì)算需要,發(fā)明了二進(jìn)制,與二進(jìn)制不同的是,六進(jìn)制對(duì)于數(shù)論研究有較大幫助.例如SKIPIF1<0在六進(jìn)制下等于十進(jìn)制的SKIPIF1<0.若數(shù)列SKIPIF1<0在十進(jìn)制下滿足SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則六進(jìn)制SKIPIF1<0轉(zhuǎn)換成十進(jìn)制后個(gè)位為(
)A.2 B.4 C.6 D.83.(2023秋·廣東·高三統(tǒng)考期末)在數(shù)列SKIPIF1<0中,SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0的值為(
)A.18 B.19 C.20 D.214.(2023秋·江西·高三校聯(lián)考期末)設(shè)SKIPIF1<0,數(shù)列SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則下列選項(xiàng)正確的是(
)A.當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),則SKIPIF1<0B.當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),則SKIPIF1<0C.當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),則SKIPIF1<0D.當(dāng)SKIPIF1<0,SKIPIF1<0時(shí),則SKIPIF1<05.(2023·全國(guó)·高三專(zhuān)題練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<06.(2023·安徽淮南·統(tǒng)考一模)斐波那契數(shù)列因以兔子繁殖為例子而引入,故又稱(chēng)為“兔子數(shù)列”.此數(shù)列在現(xiàn)代物理、準(zhǔn)晶體結(jié)構(gòu)、化學(xué)等領(lǐng)域都有著廣泛的應(yīng)用,斐波那契數(shù)列SKIPIF1<0可以用如下方法定義:SKIPIF1<0,且SKIPIF1<0,若此數(shù)列各項(xiàng)除以4的余數(shù)依次構(gòu)成一個(gè)新數(shù)列SKIPIF1<0,則數(shù)列SKIPIF1<0的前2023項(xiàng)的和為(
)A.2023 B.2024 C.2696 D.26977.(2023秋·江蘇揚(yáng)州·高三??计谀┮阎獢?shù)列SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<08.(2023·全國(guó)·高三專(zhuān)題練習(xí))已知數(shù)列SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0一、倒數(shù)變換法,適用于SKIPIF1<0(SKIPIF1<0為常數(shù))二、取對(duì)數(shù)運(yùn)算三、待定系數(shù)法1、構(gòu)造等差數(shù)列法2、構(gòu)造等比數(shù)列法①定義構(gòu)造法。利用等比數(shù)列的定義SKIPIF1<0通過(guò)變換,構(gòu)造等比數(shù)列的方法.②SKIPIF1<0(SKIPIF1<0為常數(shù))型遞推式可構(gòu)造為形如SKIPIF1<0的等比數(shù)列.③SKIPIF1<0(SKIPIF1<0為常數(shù),下同)型遞推式,可構(gòu)造為形如SKIPIF1<0的等比數(shù)列.四、函數(shù)構(gòu)造法對(duì)于某些比較復(fù)雜的遞推式,通過(guò)分析結(jié)構(gòu),聯(lián)想到與該遞推式結(jié)構(gòu)相同或相近的公式、函數(shù),再構(gòu)造“橋函數(shù)”來(lái)求出所給的遞推數(shù)列的通項(xiàng)公式的方法.9.(2023·全國(guó)·高三專(zhuān)題練習(xí))已知數(shù)列{SKIPIF1<0}滿足SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0二、多選題10.(2023·山西·統(tǒng)考一模)1202年,斐波那契在《算盤(pán)全書(shū)》中從兔子問(wèn)題得到斐波那契數(shù)列1,1,2,3,5,8,13,21SKIPIF1<0該數(shù)列的特點(diǎn)是前兩項(xiàng)為1,從第三項(xiàng)起,每一項(xiàng)都等于它前面兩項(xiàng)的和,人們把這樣的一列數(shù)組成的數(shù)列SKIPIF1<0稱(chēng)為斐波那契數(shù)列,19世紀(jì)以前并沒(méi)有人認(rèn)真研究它,但在19世紀(jì)末和20世紀(jì),這一問(wèn)題派生出廣泛的應(yīng)用,從而活躍起來(lái),成為熱門(mén)的研究課題,記SKIPIF1<0為該數(shù)列的前SKIPIF1<0項(xiàng)和,則下列結(jié)論正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0為偶數(shù)C.SKIPIF1<0 D.SKIPIF1<011.(2023秋·江蘇南通·高三統(tǒng)考期末)斐波那契數(shù)列是數(shù)學(xué)中的一個(gè)有趣的問(wèn)題,它滿足:SKIPIF1<0,SKIPIF1<0,人們?cè)谘芯克倪^(guò)程中獲得了許多漂亮的結(jié)果SKIPIF1<0某同學(xué)據(jù)此改編,研究如下問(wèn)題:在數(shù)列SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0,則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<012.(2023·全國(guó)·高三專(zhuān)題練習(xí))(多選)已知數(shù)列SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,則下列說(shuō)法正確的是(
)A.SKIPIF1<0 B.SKIPIF1<0是等比數(shù)列C.SKIPIF1<0 D.SKIPIF1<0三、填空題13.(2023秋·四川成都·高三樹(shù)德中學(xué)??计谀┮獯罄麛?shù)學(xué)家斐波那契于1202年寫(xiě)成《計(jì)算之書(shū)》,其中第12章提出兔子問(wèn)題,衍生出數(shù)列:1,1,2,3,5,8,13,….記該數(shù)列為SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.如圖,由三個(gè)圖(1)中底角為60°等腰梯形可組成一個(gè)輪廓為正三角形(圖(2))的圖形,根據(jù)改圖所揭示的幾何性質(zhì),計(jì)算SKIPIF1<0______.14.(2023·全國(guó)·高三專(zhuān)題練習(xí))數(shù)列SKIPIF1<0的前n項(xiàng)和SKIPIF1<0SKIPIF1<0,數(shù)列SKIPIF1<0滿足SKIPIF1<0SKIPIF1<0,則數(shù)列SKIPIF1<0中值最大的項(xiàng)和值最小的項(xiàng)和為_(kāi)___________.15.(2023·全國(guó)·高三專(zhuān)題練習(xí))已知數(shù)列SKIPIF1<0滿足:SKIPIF1<0,則首項(xiàng)SKIPIF1<0的取值范圍是:______當(dāng)SKIPIF1<0時(shí),記SKIPIF1<0,且SKIPIF1<0,則整數(shù)SKIPIF1<0__________.16.(2023秋·江西·高三校聯(lián)考階段練習(xí))已知數(shù)列SKIPIF1<0的各項(xiàng)均為正數(shù),且前n項(xiàng)和SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,SKIPIF1<0成等比數(shù)列,則數(shù)列SKIPIF1<0的通項(xiàng)公式________.17.(2023秋·北京通州·高三統(tǒng)考期末)已知數(shù)列SKIPIF1<0的前SKIPIF1<0項(xiàng)和為SKIPIF1<0SKIPIF1<0
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