【文档说明】??????? 44.docx,共(2)页,18.825 KB,由小赞的店铺上传
转载请保留链接:https://www.doc5u.com/view-c41eb04bfcf8564e20fda2c021a10b4e.html
以下为本文档部分文字说明:
课后定时检测案44构造法求数列的通项公式一、单项选择题1.已知数列{an}满足:a1=2,an+1=3an+2,则a4=()A.20B.26C.80D.1282.[2024·河南南阳模拟]已知数列{an}的前n
项和为Sn,首项a1=1,且满足an+1+an=3·2n,则S11=()A.4093B.4094C.4095D.40963.[2024·河北秦皇岛模拟]已知数列{an}各项均为正数,a1=3,且有an+1=3-2an,则an=()A.1
2n-1B.32n-1C.4-12n-1D.12n-1+24.[2024·黑龙江齐齐哈尔模拟]在数列{an}中,a1=3,an=2an-1-n+2(n≥2,n∈N+),若an>980,则n的最小值是()A.8B.9C.10D.115.[2024·山
西吕梁模拟]已知数列{an}满足3an-2an-1=an+1(n≥2,n∈N*),且a1=0,a6=2023,则a2=()A.202331B.202333C.202363D.2023656.已知数列{an}
中,a1=1,a2=2,an+1=2an+3an-1(n≥2,n∈N*),数列{an}的前99项和S99=()A.3(950-1)8B.950-18C.399-12D.3(949-1)8二、多项选择题7.已知数列{a
n}满足a1=1,an+1=3an+1(n∈N*),{an}的前n项和为Sn,则()A.an-12是等比数列B.an+12是等比数列C.an=3n2-12D.Sn=3n+2n-
148.[2024·重庆模拟]已知数列{an}的前n项和为Sn,若a1=2,且an+1=3an+2n,则()A.数列{an+2n}是等比数列B.数列an2n+1是等比数列C.an=2×3n-2
n+1D.Sn=2(3n-2n)三、填空题9.已知数列{an}满足a1=35,an+1=3an2an+1,则数列{an}的通项公式是________.10.已知数列{an}满足a1=1,an+1=6an+2n+1,则数列{an}的通项公式是________.