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1、數(shù)列1.求通項(xiàng)例題1.如果試寫出數(shù)列的前3項(xiàng)并求通項(xiàng)公式例題2.已知數(shù)列的前項(xiàng)和為,求數(shù)列的通項(xiàng)公式;練習(xí).1.已知數(shù)列的前項(xiàng)和,則其通項(xiàng)=;2.已知數(shù)列的前項(xiàng)和,則其通項(xiàng)=。3.已知數(shù)列{an}的前n項(xiàng)和Sn,4.已知數(shù)列{an}滿足且a1=2,求an.5.已知數(shù)列{an}滿足,,求an6.,求an.7.在數(shù)列{an}中,,求通項(xiàng)an1/68..在數(shù)列{an}中,,求通項(xiàng)an.2.數(shù)列與函數(shù)例題3.已知數(shù)列.(1)若,①數(shù)列中有多少項(xiàng)是負(fù)數(shù)?②為何值時(shí),有最小值?并求出最小值.(2)若且對(duì)于,都有成立.求實(shí)數(shù)的取值范圍.例題4.若數(shù)列的通項(xiàng)公式為:,設(shè),求數(shù)列中的最大項(xiàng).等差等比數(shù)
2、列例題5.已知數(shù)列是等差數(shù)列,若,且則,_______.例題6.在等差數(shù)列{an}中,已知a5+a7=10,Sn是數(shù)列{an}的前n項(xiàng)和,則S11的值是().A.45B.50C.55D.60[來源:學(xué)科網(wǎng)]S4S6例題7.已知Sn為等差數(shù)列{an}的前n項(xiàng)和,若S1=1,S2=4,則S4的值為().935A.4B.2C.3D.42/6例題8.等差數(shù)列的前項(xiàng)和為,已知,則的最小值為________.例題9.已知是等差數(shù)列,,公差,為其前項(xiàng)和,若成等比數(shù)列,則例題10.已知數(shù)列滿足,,令.(1)求證:數(shù)列是等差數(shù)列;(2)求數(shù)列的通項(xiàng)公式.例題11.數(shù)列的前項(xiàng)和為,若,.(1)求證:數(shù)列
3、是等比數(shù)列;(2)并求數(shù)列的通項(xiàng)公式.例題12.在數(shù)列中,.(1)證明數(shù)列是等比數(shù)列;(2)求數(shù)列的通項(xiàng)公式.例題13.等比數(shù)列滿足:,,且公比.(1)求數(shù)列的通項(xiàng)公式;(2)若該數(shù)列前項(xiàng)和,求的值.3/6例題14.已知首項(xiàng)為的等比數(shù)列的前項(xiàng)和為(),且,,成等差數(shù)列.(1)求數(shù)列的通項(xiàng)公式;(2)證明:().例題15.(1)在等比數(shù)列中,已知,,=.(2)已知各項(xiàng)均為正數(shù)的等比數(shù)列,,,則____(3)在等比數(shù)列中,,,則.例題16.數(shù)列的前n項(xiàng)和記為,(1)求數(shù)列的通項(xiàng)公式;(2)等差數(shù)列的各項(xiàng)為正,其前n項(xiàng)和為,且,又成等比數(shù)列,求.4/6求和例題17.已知數(shù)列的通項(xiàng)公式,求數(shù)
4、列的前n項(xiàng)和。例題18.求數(shù)列的前n項(xiàng)和.n2n-1*例題19.設(shè)數(shù)列{an}滿足a1+3a2+3a3+…+3an=3,n∈N.(1)證明:數(shù)列{an}為等比數(shù)列;(2)設(shè),求數(shù)列{bn}的前n項(xiàng)和Sn綜合例題20.已知數(shù)列為等差數(shù)列,且,為等比數(shù)列,數(shù)列的前三項(xiàng)依次為3,7,13.求:(1)數(shù)列,的通項(xiàng)公式(2)數(shù)列的前項(xiàng)和.5/6例題21.設(shè)曲線處的切線為,數(shù)列的首項(xiàng)(其中常數(shù)m為正奇數(shù)),且對(duì)任意,點(diǎn)均在直線上。(1)求出的通項(xiàng)公式;(2)令,當(dāng)恒成立時(shí),求出n的取值范圍,使得。例題22.已知數(shù)列的前n項(xiàng)和為,對(duì)一切正整數(shù)n,點(diǎn)(Sn,n)都在函數(shù)的圖象上.(1)求數(shù)列的通項(xiàng)公
5、式;(2)設(shè),求數(shù)列的前n項(xiàng)的和Tn.例題23.已知是等差數(shù)列,其前n項(xiàng)和為Sn,是等比數(shù)列,且,.(1)求數(shù)列與的通項(xiàng)公式;(2)記證明6/6