设数列{an}的前n项和为Sn ,若对任意n∈N* 都有Sn=3an-5n(1)求数列{an}的首项(2)求证:数数列{an+5}是等比数列 并求数列{an}的通项公式(3)数列{bn}满足bn=(9n+4)/(an+5) 问是否存在m 使得bn<m恒成
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/20 00:19:38
![设数列{an}的前n项和为Sn ,若对任意n∈N* 都有Sn=3an-5n(1)求数列{an}的首项(2)求证:数数列{an+5}是等比数列 并求数列{an}的通项公式(3)数列{bn}满足bn=(9n+4)/(an+5) 问是否存在m 使得bn<m恒成](/uploads/image/z/5326741-37-1.jpg?t=%E8%AE%BE%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E5%89%8Dn%E9%A1%B9%E5%92%8C%E4%B8%BASn+%2C%E8%8B%A5%E5%AF%B9%E4%BB%BB%E6%84%8Fn%E2%88%88N%2A+%E9%83%BD%E6%9C%89Sn%3D3an-5n%EF%BC%881%EF%BC%89%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%A6%96%E9%A1%B9%EF%BC%882%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E6%95%B0%E6%95%B0%E5%88%97%7Ban%2B5%7D%E6%98%AF%E7%AD%89%E6%AF%94%E6%95%B0%E5%88%97+%E5%B9%B6%E6%B1%82%E6%95%B0%E5%88%97%7Ban%7D%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%EF%BC%883%EF%BC%89%E6%95%B0%E5%88%97%7Bbn%7D%E6%BB%A1%E8%B6%B3bn%3D%289n%2B4%29%2F%28an%2B5%29+%E9%97%AE%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8m+%E4%BD%BF%E5%BE%97bn%EF%BC%9Cm%E6%81%92%E6%88%90)
xWRGEI(eb A")ihʕlrރA6 yH=(YOʿݣ JŻiӧos:aUNgIu_kwԤ7FJkHMfKYV
b֞hR_:zKg}X@vɈ_:0qFbs,_5k- mhdhr>αUL ߸:28r -ik4!hd
aez/s=,o[7(2:9yShB$VɟS::7O[$ )vqveF~5YB+Fsf"p1 Zد;`rE$;} ܱ"m0 cSmE$H}+rp_ﮚYqRGpsTew>Cbގ[ӌvch" {br1!1
E&EȔz$6{H!|'ᄽK])|p|ڀu^)9ݤd LJ) >a0q:L_GXUHH/QqK`
;[9\([ʥ\b28I{6
l?zoikk2"WO@hx
U[)MDBQp |3! z6On0u}*'fdN>Ֆ
H@Ą:6eO
^d-@8Bħ>NHPD\>
ء0M'*OLbʌo&/}b 1lgQʑY)|vbfK-?AhlXi۰kT+8@ :PϢt? O6z1/Q}Ỿ\<~?v34'xo|3Us~wm;]VIC7#[ʻR iwk⍠DqȽyN=Ȑ.<CA#fh7x) id6W<?hA_H" $,Ӎ"J/JFLAt-͋S9ΝbihɶM'@Cy?d]7;O{kz|pKX9FjOˊF5c;W