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7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)
7.1 数列的概念及表示(含答案)_2.2025数学总复习_2025年新高考资料_一轮复习_2025新教材数学高考第一轮基础练习(含答案)

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2025新教材数学高考第一轮复习 专题七 数列 7.1 数列的概念及表示 五年高考 考点 数列的概念及表示 1.(2019浙江,10,5分,难)设a,b∈R,数列{a }满足a =a,a =a2+b,n∈N*,则 ( ) n 1 n+1 n 1 1 A.当b= 时,a >10 B.当b= 时,a >10 2 10 4 10 C.当b=-2时,a >10 D.当b=-4时,a >10 10 10 2.(2020课标Ⅱ理,12,5分,难)0-1周期序列在通信技术中有着重要应用.若序列a a …a … 1 2 n 满足a∈{0,1}(i=1,2,…),且存在正整数m,使得a =a(i=1,2,…)成立,则称其为0-1周期序列, i i+m i 并称满足a =a(i=1,2,…)的最小正整数m为这个序列的周期.对于周期为m的0-1序列 i+m i 1 m a a …a …,C(k)= ∑❑ aa (k=1,2,…,m-1)是描述其性质的重要指标.下列周期为5的0- 1 2 n m i i+k i=1 1 1序列中,满足C(k)≤ (k=1,2,3,4)的序列是 ( ) 5 A.11010… B.11011… C.10001… D.11001… a 3.(2021浙江,10,5分,难)已知数列{a }满足a =1,a = n (n∈N*).记数列{a }的前n项和 n 1 n+1 1+√a n n 为S ,则 ( ) n 3 A. 0,a =1,则 n a2 n n+1 a2 n 1 n n+1 a = . n 1 6.(2023 重庆联考,14)数列{a }满足 a -a = (n≥2,且 n∈N*),a =2,对于任意 n∈N*有 n n n-1 n(n+1) 1 λ>a 恒成立,则λ的取值范围是 . n 7.(2024届江苏、广东、福建大联考,21)已知数列{a }满足a =1,且na -(n+1)a =1. n 1 n+1 n (1)求{a }的通项公式; n (2)若数列{a n }的前n项和为S n ,且S n =3n−1,求数列{b n }的前n项和T n . b 2 n 8.(2023湖北黄冈中学三模,17)已知正项数列{a }的前n项和为S ,且4S = +2a -3(n∈N*). n n n a2 n n(1)求数列{a }的通项公式; n (2)将数列{a }和数列{2n}中所有的项,按照从小到大的顺序排列得到一个新数列{b },求 n n {b }的前100项和. n 9.(2023广东茂名二模,17)已知数列{a }的前n(n∈N*)项和S 满足S +S =2(n+1)2,且a =1. n n n+1 n 1 (1)求a ,a ,a ; 2 3 4 (2)若S 不超过240,求n的最大值. n 10.(2023吉林东北师大附中二模,18)已知数列{a }的前n项和为S ,a =4,a n+1. n n 1 n = S 2n n (1)求数列{a }的通项公式; n (2)记c =a -1,数列{c }的前n项和为T ,求 1 1 1 的值. n n n n + +…+ 2n T T T 1 2 n11.(2023河北邯郸二模,18)已知数列{a }中,a >0,a =3,记数列{a }的前n项的乘积为S ,且 n n 1 n n S = . n √an+1 n (1)求数列{a }的通项公式; n (2)设b n =a n −1,数列{b n }的前n项和为T n ,求证:T n ∈(n-1,n). a +1 n 12.(2023山东日照联考,17)已知数列{a }的首项a =2,且满足a = 2a . n 1 n+1 n 3 a +1 n (1)求数列{a }的通项公式; n 1 1 1 1 (2)若 + + +…+ <100,求满足条件的最大整数n. a a a a 1 2 3 n专题七 数列 7.1 数列的概念及表示 五年高考 考点 数列的概念及表示 1.(2019浙江,10,5分,难)设a,b∈R,数列{a }满足a =a,a = +b,n∈N*,则 ( ) n 1 n+1 a2 n 1 1 A.当b= 时,a >10 B.当b= 时,a >10 10 10 2 4 C.当b=-2时,a >10 D.当b=-4时,a >10 10 10答案 A 2.(2020课标Ⅱ理,12,5分,难)0-1周期序列在通信技术中有着重要应用.若序列a a …a … 1 2 n 满足a∈{0,1}(i=1,2,…),且存在正整数m,使得a =a(i=1,2,…)成立,则称其为0-1周期序列, i i+m i 并称满足a =a(i=1,2,…)的最小正整数m为这个序列的周期.对于周期为m的0-1序列 i+m i 1 m a a …a …,C(k)= ∑❑ aa (k=1,2,…,m-1)是描述其性质的重要指标.下列周期为5的0- 1 2 n m i i+k i=1 1 1序列中,满足C(k)≤ (k=1,2,3,4)的序列是 ( ) 5 A.11010… B.11011… C.10001… D.11001… 答案 C 3.(2021浙江,10,5分,难)已知数列{a n }满足a 1 =1,a n+1 = a n (n∈N*).记数列{a n }的前n项和 1+√a n 为S ,则 ( ) n 3 A. 0,a =1,则 n a2 n n+1 a2 n 1 n n+1 a = . n 答案 n·2n-1 1 6.(2023 重庆联考,14)数列{a }满足 a -a = (n≥2,且 n∈N*),a =2,对于任意 n∈N*有 n n n-1 n(n+1) 1 λ>a 恒成立,则λ的取值范围是 . n 答案 [5 ) ,+∞ 2 7.(2024届江苏、广东、福建大联考,21)已知数列{a }满足a =1,且na -(n+1)a =1. n 1 n+1 n (1)求{a }的通项公式; n (2)若数列{a n }的前n项和为S n ,且S n =3n−1,求数列{b n }的前n项和T n . b 2 n 解析 (1)因为na -(n+1)a =1, n+1 n 所以a a 1 1 1 , (1分) n+1 − n= = − n+1 n n(n+1) n n+1 所以n≥2时,a (a a ) ( a a ) (a a )+a n= n− n−1 + n−1 − n−2 +…+ 2− 1 1 n n n−1 n−1 n−2 2 1 =( 1 1) ( 1 1 ) ( 1) 1, (3分) − + − +…+ 1− +1=2− n−1 n n−2 n−1 2 n 当n=1时,a =1适合上式, (4分) 1 所以a =2n-1,n∈N*. (5分) n (2)因为S =3n−1,所以当n=1时,S =a =1,得b =1; (6分) n 1 1 1 2 b 1 当n≥2时,a 3n−1 3n−1−1=3n-1, n=Sn−Sn−1= − b 2 2 n 2n−1 所以b = ,n≥2,当n=1时也成立.(7分) n 3n−1 2n−1 因此b = ,n∈N*. n 3n−11 3 5 2n−1 因为T = + + +…+ , n 30 31 32 3n−1 1 1 3 5 2n−1 所以 Tn= + + +…+ , (8分) 3 31 32 33 3n 所 以 1( 1 ) 1− 2 1 2 2 2 2n−1 3 3n−1 2n−1 1 2n−1 2n+2 Tn= + + +…+ − =1+2× − =1+1− − =2− 3 30 31 32 3n−1 3n 1 3n 3n−1 3n 3n 1− 3 (11分) n+1 故T =3- . (12分) n 3n−1 8.(2023湖北黄冈中学三模,17)已知正项数列{a }的前n项和为S ,且4S = +2a -3(n∈N*). n n n a2 n n (1)求数列{a }的通项公式; n (2)将数列{a }和数列{2n}中所有的项,按照从小到大的顺序排列得到一个新数列{b },求 n n {b }的前100项和. n 解析 (1)依题意a >0,当n=1时,4a = +2a -3,解得a =3, n 1 a2 1 1 1 当n≥2时,由4S = +2a -3,得4S = +2a -3,作差得4a = +2a -2a ,∴(a +a )(a - n a2 n n-1 a2 n-1 n a2−a2 n n-1 n n-1 n n n−1 n n−1 a -2)=0(n≥2),∵a +a >0,∴a -a =2(n≥2),∴数列{a }是首项为3,公差为2的等差数列, n-1 n n-1 n n-1 n ∴a =2n+1,n∈N*. n (2)由(1)得,a =201,又27<201<28,同时a =187>27,∴b =a , 100 93 100 93 93×(a +a ) 2×(1−27 ) ∴b +b +…+b =(a +a +…+a )+(21+22+…+27)= 1 93 + =9 089. 1 2 100 1 2 93 2 1−2 所以{b }的前100项和为9 089. n 9.(2023广东茂名二模,17)已知数列{a }的前n(n∈N*)项和S 满足S +S =2(n+1)2,且a =1. n n n+1 n 1 (1)求a ,a ,a ; 2 3 4 (2)若S 不超过240,求n的最大值. n 解析 (1)当n=1时,S +S =a +2a =2×(1+1)2=8,a =6, 2 1 2 1 2 当n=2时,S +S =a +2a +2a =2×(2+1)2=18,a =4, 3 2 3 2 1 3 当n=3时,S +S =a +2a +2a +2a =2×(3+1)2=32,a =10. 4 3 4 3 2 1 4(2)∵S +S =2(n+1)2,① n+1 n ∴当n=1时,S +S =2×22=8, 2 1 又a =S =1,则S =8-S =8-1=7, 1 1 2 1 当n≥2时,S +S =2n2,② n n-1 ①-②可得S -S =4n+2, n+1 n-1 当n(n>2)为偶数时, S -S =(4×4-2)+(4×6-2)+…+(4n-2) n 2 =[14+(4n−2)] (n )=n2+n-6, · −1 2 2 ∴S =n(n+1)+1. n 当n(n>2)为奇数时, S -S =(4×3-2)+(4×5-2)+…+(4n-2) n 1 [10+(4n−2)] n−1 = · =n2+n-2, 2 2 ∴S =n(n+1)-1, n 由15×16-1=239<240,16×17+1=273>240得n的最大值为15. 10.(2023吉林东北师大附中二模,18)已知数列{a }的前n项和为S ,a =4,a n+1. n n 1 n = S 2n n (1)求数列{a }的通项公式; n (2)记c =a -1,数列{c }的前n项和为T ,求 1 1 1 的值. n n n n + +…+ 2n T T T 1 2 n 解析 (1)由a n+1 2na , n = 得到Sn= n S 2n n+1 n 2(n−1)a 当n≥2时,S = n−1, n-1 n 2na 2(n−1)a 2(n−1)a (n−1)a 两式相减,有a = n− n−1,得到 n−1= n, n n+1 n n n+1 a a 由于n≥2,所以 n =2· n−1. n+1 n a a 因为 1=2,由上述递推关系知 n ≠0, 2 n+1所以{ a }是以2为首项,2为公比的等比数列, n n+1 a 所以 n =2×2n-1, n+1 所以a =(n+1)2n. n (2)由(1)知:c =a -1=n,则c -c =n+1-n=1, n n n+1 n 2n 所以数列{c }为等差数列, n n(n+1) 所以数列{c }的前n项和为T = , n n 2 则 1 2 (1 1 ), = =2 − T n(n+1) n n+1 n 所以 1 1 1 ( 1) (1 1) (1 1 ) 2n . + +…+ =2 1− + − +…+ − = T T T 2 2 3 n n+1 n+1 1 2 n 11.(2023河北邯郸二模,18)已知数列{a }中,a >0,a =3,记数列{a }的前n项的乘积为S ,且 n n 1 n n S = . n √an+1 n (1)求数列{a }的通项公式; n (2)设b n =a n −1,数列{b n }的前n项和为T n ,求证:T n ∈(n-1,n). a +1 n 解析 (1)由题意知S 为正项数列{a }的前n项的乘积,且S = , n n n √an+1 n 当n=2时, =(a a )2= ,所以(3a )2= ,解得a =9. S2 1 2 a3 2 a3 2 2 2 2 an+2 又 S2=an+1 ①, S2 =an+2②,②÷①得, a2 = n+1,即 an =an+1, n n n+1 n+1 n+1 an+1 n+1 n n 所以lg ,即nlg a =(n+1)lg a , an =lg an+1 n+1 n n+1 n lg a lg a lg a lg a 所以 n+1= n,所以 2= 1=lg 3, n+1 n 2 1 结合lg a lg a ,可知数列{lg a }是常数列, n+1= n n n+1 n nlg a lg a 所以 n= 1=lg 3,所以lg a =nlg 3=lg 3n,所以a =3n. n 1 n n (2)证明:由(1)可得b =a −1 3n−1 2 , n n = =1− a +1 3n+1 3n+1 n 则T =( 2 ) ( 2 ) ( 2 ) n 1− + 1− +…+ 1− 31+1 32+1 3n+1 =n-2( 1 1 1 ), + +…+ 31+1 32+1 3n+1 1( 1 ) 1− 由于 1 1 1 1 1 1 3 3n 1( 1 ) 1, + +…+ < + +…+ = = 1− < 31+1 32+1 3n+1 31 32 3n 1 2 3n 2 1− 3 故T =n-2( 1 1 1 )>n-1,且T 100,所以n≤99, 99 299 100 2100 所以满足条件的最大整数n为99.
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  1. CONNECT:[ UseTime:0.000510s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000762s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000322s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000248s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000593s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373123 LIMIT 1 [ RunTime:0.000467s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373123 [ RunTime:0.006381s ]
  10. UPDATE `wendang` SET `lasttime` = 1773115296 WHERE `id` = 373123 [ RunTime:0.000570s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373123 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000454s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373123 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000387s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373123 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001452s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373123 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001688s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373123 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001769s ]
0.100997s