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2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)

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2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)
2025届高中数学一轮复习练习:第七章 限时跟踪检测(三十八) 数列求和(含解析)_2.2025数学总复习_2025年新高考资料_一轮复习_第七章 第4讲 数列求和(课件+讲义+练习)

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限时跟踪检测(三十八) 数列求和 一、单项选择题 1.数列1,(1+2),(1+2+22),…,(1+2+22+…+2n-1),…的前n项和为( ) A.2n-1 B.n·2n-n C.2n+1-n D.2n+1-n-2 2.(2024·江西宜春模拟)已知数列{a}的通项为a=,则其前8项和为( ) n n A. B. C. D. 3.数列{(-1)n(2n-1)}的前2 020项和S 等于( ) 2 020 A.-2 020 B.2 020 C.-2 019 D.2 019 4.数列{a}的前n项和为S,a=1.对于任意正整数n,都有a =则S =( ) n n 1 n+1 20 A.0 B.15 C.31 D.61 5.(2024·四川巴蜀模拟)已知数列{a}的前n项和S 满足S =2a -4,b =a +log a , n n n n n n 2 n 则数列{b}的前10项和为( ) n A.4 162 B.4 157 C.2 146 D.2 142 二、多项选择题 6.若公差为d的等差数列{a}满足a=5,a+a=30,则下列结论正确的有( ) n 2 6 8 A.d=2 B.a=2n+1 n C.= D.的前n项和为 7.斐波那契数列{a}:1,1,2,3,5,8,13,21,34,…,又称黄金分割数列,是由十三世纪意 n 大利数学家列昂纳多·斐波那契以兔子繁殖为例引入的,故又称为“兔子数列”,其通项公 式为a =,是用无理数表示有理数的一个范例,该数列从第 3项开始,每项等于其前相邻 n 两项之和,即a =a +a,记该数列{a}的前n项和为S,则下列结论正确的是( ) n+2 n+1 n n n A.S =11a 10 7 B.a =2a +a 2 021 2 019 2 018 C.S =S +S 2 021 2 020 2 019 D.S =a -1 2 019 2 020 三、填空题与解答题 8.(2024·河南开封模拟)在数列{a}中,a =1,a +(-1)na =2(n∈N*).记S 是数列 n 1 n+2 n n {a}的前n项和,则S =________. n 20 9.(2024·四川成都模拟)已知数列{a}满足a =1,a =2,a =a +sin2,则该数列的 n 1 2 n+2 n 前20项和为________. 10.(2024·广东深圳月考)已知数列{a}的前n项和为S ,且满足a =1,a =2,S +1 n n 1 2 n =a -a (n∈N*),则S=________. n+2 n+1 n 11.(2024·河南新乡模拟)已知数列{a}为等差数列,数列{b}为等比数列,a+b=4, n n 1 1且ab+ab+ab+…+ab=(n-1)·2n+2+4. 1 1 2 2 3 3 n n (1)求{a}与{b}的通项公式; n n (2)设等差数列{a}的前n项和为S,求数列的前n项和T. n n n 12.(2024·东北三省三校联考)已知等差数列{a}的首项a =1,公差为d,记{a}的前n n 1 n 项和为S,且S-2aa+14=0. n 4 2 3 (1)求数列{a}的通项公式; n (2)若数列{a}的公差d>1,令c=,求数列{c}的前n项和T. n n n n 13.(2024·浙江嘉兴模拟)已知{a}是首项为2,公差为3的等差数列,数列{b}满足b n n 1 =4,b =3b-2n+1. n+1 n (1)证明{b-n}是等比数列,并求{a},{b}的通项公式; n n n (2)若数列{a}与{b}中有公共项,即存在k,m∈N*,使得a=b 成立.按照从小到大 n n k m 的顺序将这些公共项排列,得到一个新的数列,记作{c},求c+c+…+c. n 1 2 n 14.(2024·四川绵阳南山中学模拟)在①S =2S +2,②a -a =2n这两个条件中任 n+1 n n+1 n 选一个,补充在下面的问题中,并解答该问题. 已知数列{a}的前n项和为S,a=2,且________. n n 1 (1)求数列{a}的通项公式; n (2)若b=(n+1)·a,求数列{b}的前n项和T. n n n n 注:若选择多个条件分别解答,则按第一个解答计分. 15.已知数列{a}是正项等比数列,满足a 是2a 3a 的等差中项,a=16. n 3 1, 2 4(1)求数列{a}的通项公式; n (2)若b=(-1)nlog a ,求数列{b}的前n项和T. n 2 2n+1 n n 高分推荐题 16.(2024·广东梅州模拟)已知 S 是数列{a}的前 n 项和,a =1,________. n n 1 ①∀n∈N*,a +a =4n;②数列为等差数列,且的前3项和为6.从以上两个条件中任选 n n+1 一个补充在横线处,并求解. (1)求数列{a}的通项公式; n (2)设b=,求数列{b}的前n项和T. n n n 注:若选择多个条件分别解答,则按第一个解答计分. 解析版 一、单项选择题 1.数列1,(1+2),(1+2+22),…,(1+2+22+…+2n-1),…的前n项和为( ) A.2n-1 B.n·2n-n C.2n+1-n D.2n+1-n-2 解析:记a=1+2+22+…+2n-1=2n-1, n ∴S=-n=2n+1-n-2. n 答案:D 2.(2024·江西宜春模拟)已知数列{a}的通项为a=,则其前8项和为( ) n n A. B. C. D. 解析:a====,所以前8项和为×=×=,故选D. n 答案:D 3.数列{(-1)n(2n-1)}的前2 020项和S 等于( ) 2 020 A.-2 020 B.2 020 C.-2 019 D.2 019解析:S =-1+3-5+7+…-(2×2 019-1)+(2×2 020-1)= 2 020 =2 020.故选B. 答案:B 4.数列{a}的前n项和为S,a=1.对于任意正整数n,都有a =则S =( ) n n 1 n+1 20 A.0 B.15 C.31 D.61 解析:由题设知,当1≤n≤5时,{a}是首项为1,公比为2的等比数列,故a =2n-1且 n n 1≤n≤5,所以a=16,则a=a-2=14,故n>5时,{a}是首项为14,公差为-2的等差数 5 6 5 n 列,故a=26-2n且n>5,所以S =S+(S -S)=+=31.故选C. n 20 5 20 5 答案:C 5.(2024·四川巴蜀模拟)已知数列{a}的前n项和S 满足S =2a -4,b =a +log a , n n n n n n 2 n 则数列{b}的前10项和为( ) n A.4 162 B.4 157 C.2 146 D.2 142 解析:因为S =2a -4,所以当n=1时,S =2a -4,即a =2a -4,则a =4,当 n n 1 1 1 1 1 n≥2时,S =2a -4,所以a =S -S ,即a =2a -4-(2a -4),则a =2a ,所 n-1 n-1 n n n-1 n n n-1 n n-1 以数列{a}是首项为4,公比为2的等比数列,所以a =4×2n-1=2n+1,b =a +log a =2n+1 n n n n 2 n +n+1,所以数列{b}的前10项和为22+2+23+3+24+4+…+211+11=(22+23+…+211) n +(2+3+…+11)=+=4 157.故选B. 答案:B 二、多项选择题 6.若公差为d的等差数列{a}满足a=5,a+a=30,则下列结论正确的有( ) n 2 6 8 A.d=2 B.a=2n+1 n C.= D.的前n项和为 解析:∵{a}为等差数列, n ∴a+a=2a=30,即a=15, 6 8 7 7 ∴a-a=5d,又a=5, 7 2 2 ∴d=2,A正确; ∴a=a+(n-2)d=2n+1,B正确; n 2 ∴==,C错误; ∴的前n项和为 ==,D正确. 答案:ABD 7.斐波那契数列{a}:1,1,2,3,5,8,13,21,34,…,又称黄金分割数列,是由十三世纪意 n大利数学家列昂纳多·斐波那契以兔子繁殖为例引入的,故又称为“兔子数列”,其通项公 式为a =,是用无理数表示有理数的一个范例,该数列从第 3项开始,每项等于其前相邻 n 两项之和,即a =a +a,记该数列{a}的前n项和为S,则下列结论正确的是( ) n+2 n+1 n n n A.S =11a 10 7 B.a =2a +a 2 021 2 019 2 018 C.S =S +S 2 021 2 020 2 019 D.S =a -1 2 019 2 020 解析:由斐波那契数列{a}:1,1,2,3,5,8,13,21,34,55,…,可得 n S =1+1+2+3+5+8+13+21+34+55=143=11×13=11a,因此A正确; 10 7 a =a +a =2a +a ,因此B正确; 2 021 2 020 2 019 2 019 2 018 ∵a-a=a,a-a=a,…, 3 2 1 4 3 2 a -a =a , 2 021 2 020 2 019 ∴a -a=S , 2 021 2 2 019 ∴a -1=S ,因此D不正确; 2 021 2 019 类比D可得S =a -1, 2 021 2 023 S =a -1,又∵a -1=S , 2 020 2 022 2 021 2 019 ∴S +S =a +a -2=a -2≠S ,因此C不正确. 2 020 2 019 2 022 2 021 2 023 2 021 故选AB. 答案:AB 三、填空题与解答题 8.(2024·河南开封模拟)在数列{a}中,a =1,a +(-1)na =2(n∈N*).记S 是数列 n 1 n+2 n n {a}的前n项和,则S =________. n 20 解析:当n为奇数时,a -a =2,所以数列{a}的奇数项是以1为首项,公差为2的 n+2 n n 等差数列,所以a +a +…+a =10×1+=100;当n为偶数时,a +a =2,所以a +a 1 3 19 n+2 n 2 4 +…+a =(a+a)+(a+a)+…+(a +a )=2×5=10.因此,S =100+10=110. 20 2 4 6 8 18 20 20 答案:110 9.(2024·四川成都模拟)已知数列{a}满足a =1,a =2,a =a +sin2,则该数列的 n 1 2 n+2 n 前20项和为________. 解析:由题中条件知,a =1,a =2,a =a +1=2,a =2a +0=4,a =a +1=3, 1 2 3 1 4 2 5 3 a=2a=8,…, 6 4 即其奇数项构成首项为1,公差为1的等差数列, 而其偶数项则构成首项为2,公比为2的等比数列, 所以该数列的前20项和为(1+2+3+…+10)+(2+4+8+…+210)=2 101. 答案:2 101 10.(2024·广东深圳月考)已知数列{a}的前n项和为S ,且满足a =1,a =2,S +1 n n 1 2 n =a -a (n∈N*),则S=________. n+2 n+1 n 解析:∵S+1=a -a , n n+2 n+1 ∴S+1=S -S -(S -S), n n+2 n+1 n+1 n 则S +1=2(S +1). n+2 n+1由a=1,a=2,可得S+1=2(S+1), 1 2 2 1 ∴S +1=2(S+1)对任意的n∈N*都成立, n+1 n ∴数列{S+1}是首项为2,公比为2的等比数列, n ∴S+1=2n,即S=2n-1. n n 答案:2n-1 11.(2024·河南新乡模拟)已知数列{a}为等差数列,数列{b}为等比数列,a+b=4, n n 1 1 且ab+ab+ab+…+ab=(n-1)·2n+2+4. 1 1 2 2 3 3 n n (1)求{a}与{b}的通项公式; n n (2)设等差数列{a}的前n项和为S,求数列的前n项和T. n n n 解:(1)因为ab+ab+ab+…+ab=(n-1)·2n+2+4, 1 1 2 2 3 3 n n 当n=1时,ab=4, 1 1 由a+b=4,解得a=b=2. 1 1 1 1 又由ab+ab+ab+…+ab=(n-1)·2n+2+4, 1 1 2 2 3 3 n n 当n≥2时,可得ab+ab+ab+…+a b =(n-2)·2n+1+4, 1 1 2 2 3 3 n-1 n-1 两式相减,得ab=n·2n+1,n≥2, n n 当n=1时,ab=4适合上式,所以ab=n·2n+1,n∈N*. 1 1 n n 因为{a}为等差数列,{b}为等比数列,所以{b}的公比为2,所以b =bqn-1=2·2n-1 n n n n 1 =2n,a=2n. n (2)由b=2n,可得数列{b}的前n项和为=2n+1-2, n n 又由a=2n,可得数列{a}的前n项和S=n2+n, n n n 则===-, 所以数列的前n项和为1-+-+…+-=1-, 所以数列的前n项和T=2n+1-2+1-=2n+1--1. n 12.(2024·东北三省三校联考)已知等差数列{a}的首项a =1,公差为d,记{a}的前n n 1 n 项和为S,且S-2aa+14=0. n 4 2 3 (1)求数列{a}的通项公式; n (2)若数列{a}的公差d>1,令c=,求数列{c}的前n项和T. n n n n 解:(1)由题意可得,S -2aa +14=4a +6d-2(a +d)(a +2d)+14=4+6d-2(1+d) 4 2 3 1 1 1 (1+2d)+14=0, 整理得d2=4,则d=±2, 可得a=1+2(n-1)=2n-1或a=1-2(n-1)=-2n+3, n n 故a=2n-1或a=-2n+3. n n (2)因为d>1,由(1)可得d=2,a=2n-1, n 则c= n =-, 故T=c+c+c+…+c=++…+=1-, n 1 2 3 n 所以T=1-. n 13.(2024·浙江嘉兴模拟)已知{a}是首项为2,公差为3的等差数列,数列{b}满足b n n 1 =4,b =3b-2n+1. n+1 n(1)证明{b-n}是等比数列,并求{a},{b}的通项公式; n n n (2)若数列{a}与{b}中有公共项,即存在k,m∈N*,使得a=b 成立.按照从小到大 n n k m 的顺序将这些公共项排列,得到一个新的数列,记作{c},求c+c+…+c. n 1 2 n 解:(1)由题意可得a=2+(n-1)×3=3n-1(n∈N*), n 而b=4,b =3b-2n+1,变形可得b -(n+1)=3b-3n=3(b-n),b-1=3, 1 n+1 n n+1 n n 1 故{b-n}是首项为3,公比为3的等比数列, n 所以b-n=3n,即b=3n+n(n∈N*). n n (2)由题意可得3k-1=3m+m(k,m∈N*),因为3k,3m是3的倍数,所以m+1也为3的 倍数, 令m+1=3n,则m=3n-1(n∈N*), 则3k-1=33n-1+3n-1=3(33n-2+n)-1,此时满足条件, 即当m=2,5,8,…,3n-1时为公共项, 所以c+c+…+c=b+b+…+b 1 2 n 2 5 3n-1 =32+35+…+33n-1+(2+5+…+3n-1) =+(n∈N*). 14.(2024·四川绵阳南山中学模拟)在①S =2S +2,②a -a =2n这两个条件中任 n+1 n n+1 n 选一个,补充在下面的问题中,并解答该问题. 已知数列{a}的前n项和为S,a=2,且________. n n 1 (1)求数列{a}的通项公式; n (2)若b=(n+1)·a,求数列{b}的前n项和T. n n n n 注:若选择多个条件分别解答,则按第一个解答计分. 解:(1)若选①,S =2S+2, n+1 n 当n≥2时,S=2S +2,两式相减得a =2a,n≥2. n n-1 n+1 n 当n=1时,S=2S+2,即a+a=2a+2,又a=2,所以a=2a, 2 1 1 2 1 1 2 1 所以a =2a ,n∈N*,即数列{a}是首项为2,公比为2的等比数列,故a =2n, n+1 n n n n∈N*. 若选②,因为a -a=2n, n+1 n 所以当n≥2时,a -a =(a -a)+(a -a)+…+(a -a )=21+22+…+2n-1==2n- n 1 2 1 3 2 n n-1 2,所以a=2n-2+a=2n, n 1 当n=1时,a=2满足上式,故a=2n,n∈N*. 1 n (2)由(1)知b=(n+1)·a=(n+1)×2n, n n 则T=2×2+3×22+4×23+…+(n+1)×2n, n 2T=2×22+3×23+…+n×2n+(n+1)×2n+1, n 两式相减,得-T=4+22+23+…+2n-(n+1)×2n+1=4+-(n+1)×2n+1=4-4+2n+1- n (n+1)×2n+1=-n×2n+1,故T=n×2n+1. n 15.已知数列{a}是正项等比数列,满足a 是2a 3a 的等差中项,a=16. n 3 1, 2 4 (1)求数列{a}的通项公式; n (2)若b=(-1)nlog a ,求数列{b}的前n项和T. n 2 2n+1 n n 解:(1)设等比数列{a}的公比为q, n因为a 是2a 3a 的等差中项, 3 1, 2 所以2a=2a+3a,即2aq2=2a+3aq, 3 1 2 1 1 1 因为a≠0,所以2q2-3q-2=0, 1 解得q=2或q=-, 因为数列{a}是正项等比数列,所以q=2. n 所以a=a·qn-4=2n. n 4 (2)方法一(分奇、偶并项求和): 由(1)可知,a =22n+1, 2n+1 所以b=(-1)n·log a n 2 2n+1 =(-1)n·log 22n+1=(-1)n·(2n+1), 2 若n为偶数, T=-3+5-7+9-…-(2n-1)+(2n+1) n =(-3+5)+(-7+9)+…+[-(2n-1)+(2n+1)]=2×=n; 若n为奇数,当n≥3时, T=T +b=n-1-(2n+1)=-n-2, n n-1 n 当n=1时,T=-3适合上式, 1 综上得T= n (或T=(n+1)(-1)n-1,n∈N*). n 方法二(错位相减法): 由(1)可知,a =22n+1, 2n+1 所以b=(-1)n·log a =(-1)n·log 22n+1=(-1)n·(2n+1), n 2 2n+1 2 T=(-1)1×3+(-1)2×5+(-1)3×7+…+(-1)n·(2n+1), n 所以-T=(-1)2×3+(-1)3×5+(-1)4×7+…+(-1)n+1(2n+1), n 所以2T=-3+2[(-1)2+(-1)3+…+(-1)n]-(-1)n+1(2n+1) n =-3+2×+(-1)n(2n+1) =-3+1-(-1)n-1+(-1)n(2n+1) =-2+(2n+2)(-1)n, 所以T=(n+1)(-1)n-1,n∈N*. n 高分推荐题 16.(2024·广东梅州模拟)已知 S 是数列{a}的前 n 项和,a =1,________. n n 1 ①∀n∈N*,a +a =4n;②数列为等差数列,且的前3项和为6.从以上两个条件中任选 n n+1 一个补充在横线处,并求解. (1)求数列{a}的通项公式; n (2)设b=,求数列{b}的前n项和T. n n n 注:若选择多个条件分别解答,则按第一个解答计分. 解:(1)选条件①:由∀n∈N*,a+a =4n,得a +a =4(n+1), n n+1 n+1 n+2 所以a -a=4(n+1)-4n=4, n+2 n 即数列{a },{a }(k∈N*)均为公差为4的等差数列, 2k-1 2k 于是a =a+4(k-1)=4k-3=2(2k-1)-1,又a+a=4,所以a=3,a =a+4(k 2k-1 1 1 2 2 2k 2-1)=4k-1=2(2k)-1,所以a=2n-1,n∈N*. n 选条件②:因为数列为等差数列,且的前3项和为6,所以++=3×=6,所以=2, 所以的公差为d′=-=2-1=1,得到=1+(n-1)=n,则S=n2, n 当n≥2时,a=S-S =n2-(n-1)2=2n-1. n n n-1 又a=1满足a=2n-1,所以对任意的n∈N*,a=2n-1. 1 n n (2)因为b= n = =, 所以T=b+b+…+b===. n 1 2 n
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  1. CONNECT:[ UseTime:0.000420s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000597s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000287s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000495s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000562s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370184 LIMIT 1 [ RunTime:0.000575s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370184 [ RunTime:0.001656s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093007 WHERE `id` = 370184 [ RunTime:0.000446s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370184 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000661s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370184 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000385s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370184 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003425s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370184 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006434s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370184 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009016s ]
0.094440s