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2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练

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2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练
2025版新教材高考数学第二轮复习专题练--6.4 数列求和(含答案)_2.2025数学总复习_2025年新高考资料_二轮复习_备考20252025版新教材高考数学第二轮复习专题练

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2025版新教材高考数学第二轮复习 6.4 数列求和 五年高考 高考新风向 (2024全国甲理,18,12分,易)记S 为数列{a }的前n项和,已知4S =3a +4. n n n n (1)求{a }的通项公式; n (2)设b =(-1)n-1na ,求数列{b }的前n项和T . n n n n 考点 数列求和 1.(多选)(2021新高考Ⅱ,12,5分,难)设正整数n=a ·20+a ·21+…+a ·2k-1+a ·2k,其中a∈{0,1}, 0 1 k-1 k i 记ω(n)=a +a +…+a ,则( ) 0 1 k A.ω(2n)=ω(n) B.ω(2n+3)=ω(n)+1 C.ω(8n+5)=ω(4n+3) D.ω(2n-1)=n 2.(2021新高考Ⅰ,16,5分,难)某校学生在研究民间剪纸艺术时,发现剪纸时经常会沿纸的 某条对称轴把纸对折.规格为20 dm×12 dm的长方形纸,对折1次共可以得到10 dm×12 dm,20 dm×6 dm 两种规格的图形,它们的面积之和 S =240 dm2,对折 2 次共可以得到 5 1 dm×12 dm,10 dm×6 dm,20 dm×3 dm 三种规格的图形,它们的面积之和S =180 dm2,以此类 2n 推.则对折4次共可以得到不同规格图形的种数为 ;如果对折n次,那么∑❑S = k k=1 dm2. 3.(2021新高考Ⅰ,17,10分,易)已知数列{a }满足a =1,a ={a +1,n为奇数, n 1 n+1 n a +2,n为偶数. n (1)记b =a ,写出b ,b ,并求数列{b }的通项公式; n 2n 1 2 n (2)求{a }的前20项和. n 4.(2020新高考Ⅰ,18,12分,中)已知公比大于1的等比数列{a }满足a +a =20,a =8. n 2 4 3 (1)求{a }的通项公式; n (2)记b 为{a }在区间(0,m](m∈N*)中的项的个数,求数列{b }的前100项和S . m n m 100三年模拟 练速度 1.(2024 浙江杭州二模,5)设数列{a },{b }满足 a =b =1,a +b =2n,a +b =2n.设 S 为数列 n n 1 1 n n+1 n+1 n n {a +b }的前n项的和,则S = ( ) n n 7 A.110 B.120 C.288 D.306 2.(2024 浙江金丽衢十二校第二次联考,15)已知等差数列{a }的前 n 项和为 S ,且 n n 2S =2a +n2-1. n n (1)求a ; n (2)求数列{ 1 }的前n项和T . n a a n n+1 3.(2024江苏南通、徐州大联考,15)已知正项数列{a }的前n项和为S ,且4S =(a +1)2. n n n n (1)求数列{a }的通项公式; n (2)若b =a · ,求数列{b }的前n项和T . n n a n n 2n练思维 1.(2024广东汕头一模,15)已知数列{a n }和{b n },其中b n =2a n,n∈N*,数列{a n +b n }的前n项和为 S . n (1)若a =2n,求S ; n n (2)若S =3n,求数列{a }和{b }的通项公式. n n n 2.(2024山东日照一模,16)已知各项均为正数的数列{a }的前n项和为S ,且a ,S , 为等差 n n n n a2 n 数列. (1)求a 及{a }的通项公式; 1 n 4 (2)记集合 a a + ≤2k,k∈N* 的元素个数为b ,求数列{b }的前50项和. n n k k a n3.(2024山东聊城二模,17)已知数列{a },{b }满足a =b +12m,a =mb ,m为常数,若{a } n n 2n-1 2n-1 2n 2n n 为等差数列,且b -b =2(b -b )=2(a +b )=8. 4 2 3 1 1 1 (1)求m的值及{a }的通项公式; n (2)求{b }的前2n项和S . n 2n 练风向 (新定义理解)(2024湖南长沙雅礼中学一模,19)约数,又称因数.它的定义如下:若整数a除 以整数m(m≠0)除得的商正好是整数而没有余数,我们就称a为m的倍数,m为a的约数.设 正整数a共有k个正约数,即为a ,a ,…,a ,a (a 1),依题意有 n {a 1 q+a 1 q3=20, 解得a =2,q=2或a =32,q= 1 (舍)(注意:不要忽略公比大于1这一条件), 1 1 a q2=8, 2 1 所以a =2n,所以数列{a }的通项公式为a =2n. n n n (2)由于21=2,22=4,23=8,24=16,25=32,26=64,27=128, 所以b 对应的区间为(0,1],则b =0; 1 1 b ,b 对应的区间分别为(0,2],(0,3],则b =b =1,即有2个1; 2 3 2 3 b ,b ,b ,b 对应的区间分别为(0,4],(0,5],(0,6],(0,7],则b =b =b =b =2,即有22个2; 4 5 6 7 4 5 6 7 b ,b ,…,b 对应的区间分别为(0,8],(0,9],…,(0,15],则b =b =…=b =3,即有23个3; 8 9 15 8 9 15 b ,b ,…,b 对应的区间分别为(0,16],(0,17],…,(0,31],则b =b =…=b =4,即有24个4; 16 17 31 16 17 31 b ,b ,…,b 对应的区间分别为(0,32],(0,33],…,(0,63],则b =b =…=b =5,即有25个5; 32 33 63 32 33 63 b ,b ,…,b 对应的区间分别为(0,64],(0,65],…,(0,100],则b =b =…=b =6,即有37个6. 64 65 100 64 65 100 所以S =1×2+2×22+3×23+4×24+5×25+6×37=480. 100三年模拟 练速度 1.(2024 浙江杭州二模,5)设数列{a },{b }满足 a =b =1,a +b =2n,a +b =2n.设 S 为数列 n n 1 1 n n+1 n+1 n n {a +b }的前n项的和,则S = ( A ) n n 7 A.110 B.120 C.288 D.306 2.(2024 浙江金丽衢十二校第二次联考,15)已知等差数列{a }的前 n 项和为 S ,且 n n 2S =2a +n2-1. n n (1)求a ; n (2)求数列{ 1 }的前n项和T . n a a n n+1 解析 (1)因为2S =2a +n2-1,① n n 所以当n≥2时,2S =2a +(n-1)2-1,② n-1 n-1 1 ①-②得2a =2a -2a +2n-1,整理得a =n- ,n≥2, n n n-1 n-1 2 1 所以a =n+ ,n∈N*. n 2 1 (2)由(1)知a =n+ , n 2 1 1 1 1 2 2 所以 =( 1)( 3)= 1- 3= - , a a n+ n+ n+ n+ 2n+1 2n+3 n n+1 2 2 2 2 1 1 1 2 2 2 2 2 2 2 2 所以T = + +…+ = - + - +…+ - = - . n a a a a a a 3 5 5 7 2n+1 2n+3 3 2n+3 1 2 2 3 n n+1 3.(2024江苏南通、徐州大联考,15)已知正项数列{a }的前n项和为S ,且4S =(a +1)2. n n n n (1)求数列{a }的通项公式; n (2)若b =a · ,求数列{b }的前n项和T . n n a n n 2n 解析 (1)因为4S = , n (a +1) 2 n 所以当n≥2时,4S = , n-1 (a +1) 2 n−1 所以4a = - = - +2a -2a , n (a +1) 2 (a +1) 2 a2 a2 n n-1 n n−1 n n−1 整理,得2a +2a =(a -a )(a +a ), n n-1 n n-1 n n-1 因为a >0, n所以a -a =2, n n-1 所以数列{a }是公差为2的等差数列. n 当n=1时,4S =4a = , 1 1 (a +1) 2 1 解得a =1, 1 所以数列{a }的通项公式为a =2n-1. n n (2)由(1)得b =a · =(2n-1)(2n+1-1)=(2n-1)2n+1-(2n-1), n n a 2n n n 记A =∑❑(2i-1)2i+1,B =∑❑(2i-1), n n i=1 i=1 n 则B =∑❑(2i-1)=n2, n i=1 n n 因为A =∑❑(2i-1)2i+1,2A =∑❑(2i-1)2i+2, n n i=1 i=1 所以-A =22+2(23+24+…+2n+1)-(2n-1)2n+2 n =-(2n-3)2n+2-12, 所以A =(2n-3)2n+2+12, n 所以T =A -B =(2n-3)2n+2+12-n2. n n n 练思维 1.(2024广东汕头一模,15)已知数列{a n }和{b n },其中b n =2a n,n∈N*,数列{a n +b n }的前n项和为 S . n (1)若a =2n,求S ; n n (2)若S =3n,求数列{a }和{b }的通项公式. n n n 解析 (1)当a =2n时,{a }是首项为2,公差为2的等差数列. (1分) n n 又b =22n=4n,所以{b }是首项为4,公比为4的等比数列, (2分) n n 从而S =(a +a +…+a )+(b +b +…+b )(3分) n 1 2 n 1 2 n n(2+2n) 4×(1−4n ) = + 2 1−4 4n+1 4 = +n2+n- . (6分) 3 3 (2)当n≥2时,a +b =S -S =3, (7分) n n n n-1 当n=1时,a +b =S =3,满足上式, (8分) 1 1 1 故a n +b n =3(n∈N*),即a n +2a n=3, (9分) 令f(x)=x+2x,则f(x)在R上单调递增,且f(1)=3, (11分) 从而a =1, (12分) n则b =3-a =2. (13分) n n 2.(2024山东日照一模,16)已知各项均为正数的数列{a }的前n项和为S ,且a ,S , 为等差 n n n n a2 n 数列. (1)求a 及{a }的通项公式; 1 n 4 (2)记集合 a a + ≤2k,k∈N* 的元素个数为b ,求数列{b }的前50项和. n n k k a n 解析 (1)因为a ,S , 为等差数列, n n a2 n 所以2S =a + ,且a >0, n n a2 n n 当n=1时,2S =2a =a + ,可得a =1. (2分) 1 1 1 a2 1 1 当n≥2时,2(S -S )=2a =a + -a - , (4分) n n-1 n n a2 n-1 a2 n n−1 则a +a = - =(a +a )(a -a ), n n-1 a2 a2 n n-1 n n-1 n n−1 由a +a >0,得a -a =1, (6分) n n-1 n n-1 所以{a }是首项为1,公差为1的等差数列,故a =n. (7分) n n (2)原式等价于1( 4) ≤k, n+ 2 n 因为1( 4)≥2,当且仅当n=2时“=”成立, n+ 2 n 所以b =0,b =1, (9分) 1 2 2k−1 2 1 2 2k 2 1 当k≥3时,因为 + =k- + k, 2 2k−1 2 2k−1 2 2k k n 2 所以能使 + ≤k成立的n的最大值为2k-1, 2 n 所以b =2k-1(k≥3), (13分) k (5+99)×48 所以{b }的前50项和为0+1+5+7+…+99=0+1+ =2 497. (15分) k 2 3.(2024山东聊城二模,17)已知数列{a },{b }满足a =b +12m,a =mb ,m为常数,若{a } n n 2n-1 2n-1 2n 2n n 为等差数列,且b -b =2(b -b )=2(a +b )=8. 4 2 3 1 1 1 (1)求m的值及{a }的通项公式; n(2)求{b }的前2n项和S . n 2n 解析 (1)由题意知b -b =8,b -b =4,a +b =4, (1分) 4 2 3 1 1 1 a =b +12m, { 1 1 a =mb , 2 2 因为a =b +12m,a =mb ,所以 a =b +12m, (2分) 2n-1 2n-1 2n 2n 3 3 a =mb , 4 4 a +b =2a −12m, 1 1 1 设等差数列{a }的公差为d, n d=2, { { a −a =b −b =4=2d, 1 3 1 3 1 m= , 则 a −a =m(b −b )=8m=2d, 解得 2 (5分) 4 2 4 2 a +b =2a −12m=4, b =−1, 1 1 1 1 a =5. 1 所以a =5+(n-1)×2=2n+3, n 1 所以m的值为 ,{a }的通项公式为a =2n+3. (7分) n n 2 (2)由(1)知,a =2n+3,b =a -6,b =2a , (8分) n 2n-1 2n-1 2n 2n 所以S =(b +b +b +…+b )+(b +b +b +…+b ) 2n 1 3 5 2n-1 2 4 6 2n =(a +a +a +…+a -6n)+2(a +a +a +…+a ) 1 3 5 2n-1 2 4 6 2n n(a +a ) n(a +a ) n(5+4n+1) = 1 2n−1 -6n+2× 2 2n = -6n+n(7+4n+3)=6n2+7n. 2 2 2 所以{b }的前2n项和S =6n2+7n. (15分) n 2n 练风向 (新定义理解)(2024湖南长沙雅礼中学一模,19)约数,又称因数.它的定义如下:若整数a除 以整数m(m≠0)除得的商正好是整数而没有余数,我们就称a为m的倍数,m为a的约数.设 正整数a共有k个正约数,即为a ,a ,…,a ,a (a a ,所以a = ,所以a -a ,a -a ,…,a - 2 3 3 2 3 a2 2 1 3 2 k 2 a 为a -a , -a ,…, - ,所以a= (k≥4). k-1 2 1 a2 2 ak−1 ak−2 ak−1 2 2 2 2 (3)证明:由题意知a a =a,a a =a,…,aa =a,…,(1≤i≤k)所以A= a2 + a2 +…+ a2 , 1 k 2 k-1 i k+1-i a a a a a a k−1 k k−2 k−1 1 2 因为 1 ≤a −a = 1 - 1 ,…, 1 ≤a −a = 1 - 1 , 2 1 k k−1 a a a a a a a a a a a a 1 2 1 2 1 2 k−1 k k−1 k k−1 k a2 a2 a2 1 1 1 所 以 A= + +…+ =a2 + +…+ ≤a2 a a a a a a a a a a a a k−1 k k−2 k−1 1 2 k−1 k k−2 k−1 1 2 ( 1 1 1 1 1 1 )=a2( 1 1 ), − + − +…+ − − a a a a a a a a 1 2 2 3 k−1 k 1 k 1 1 因为a =1,a =a,所以 - <1, 1 k a a 1 k 所以A≤a2( 1 1 )
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  1. CONNECT:[ UseTime:0.000995s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001845s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000754s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000739s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001527s ]
  6. SELECT * FROM `set` [ RunTime:0.000619s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001996s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370760 LIMIT 1 [ RunTime:0.001297s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370760 [ RunTime:0.051759s ]
  10. UPDATE `wendang` SET `lasttime` = 1773096137 WHERE `id` = 370760 [ RunTime:0.008727s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370760 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001173s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370760 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007525s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370760 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002789s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370760 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004707s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370760 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004753s ]
0.241082s