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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(三十六) 等差数列(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2讲 等差数列(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(三十六) 等差数列(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2讲 等差数列(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(三十六) 等差数列(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2讲 等差数列(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(三十六) 等差数列(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2讲 等差数列(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(三十六) 等差数列(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2讲 等差数列(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(三十六) 等差数列(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2讲 等差数列(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(三十六) 等差数列(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2讲 等差数列(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(三十六) 等差数列(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2讲 等差数列(课件+讲义+练习)

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限时跟踪检测(三十六) 等差数列 一、单项选择题 1.(2019·全国Ⅰ卷,理)记S 为等差数列{a}的前n项和.已知S =0,a =5,则( n n 4 5 ) A.a=2n-5 B.a=3n-10 n n C.S=2n2-8n D.S=n2-2n n n 2.已知数列{a}满足a =1,a =ra +r(n∈N*,r∈R,r≠0),则“r=1”是“数列 n 1 n+1 n {a}为等差数列”的( ) n A.充分不必要条件 B.必要不充分条件 C.充要条件 D.既不充分也不必要条件 3.(2024·山东济南模拟)在等差数列{a}中,a ,a 是方程x2+6x+2=0的两个实数根, n 2 14 则=( ) A.- B.-3 C.-6 D.2 4.(2024·湘赣皖十五校联考)已知数列{a}的前n项和为S ,且满足数列{2a}是等比数 n n n 列,若a+a +a =,则S 的值是( ) 4 1 009 2 014 2 017 A. B.1 008 C.2 015 D.2 016 5.已知椭圆+=1上有n个不同的点P,P,P,…,P,椭圆右焦点为F,若数列是 1 2 3 n 公差大于的等差数列,则n的最大值为( ) A.2 017 B.2 018 C.4 036 D.4 037 6.设数列{a}的前n项和为S,且是等差数列,若a=3a,则=( ) n n 3 5 A. B. C. D. an+1 an 7.(2024·辽宁实验中学等五校联考)已知数列{a}满足3 =9·3 (n∈N*),且a n 2 +a+a=9,则log (a+a+a )=( ) 4 6 1 9 11 \f(1,3 A.- B.3 C.-3 D. 8.(2024·福建三明一中期末)《九章算术》是我国古代的一本数学名著.全书有方田、 粟米、衰分、少广、商功、均输、盈不足、方程、勾股九章,收有 246个与生产、生活实 践有联系的应用问题.书中有这样一道题目“今有五人分五钱,令上二人所得与下三人等 问各得几何?”其意思为“现有五个人分 5钱,且较多的两份之和等于较少的三份之和, 问五人各得多少?”在此题中,若每人分得钱数成等差数列,则任意两人分得的最大差值 为( ) A. B.C. D. 9.设等差数列{a}的前n项和为S,若S =-2,S =0,S =3,则m=( ) n n m-1 m m+1 A.3 B.4 C.5 D.6 二、多项选择题 10.(2024·河北石家庄期末)已知等差数列{a}的前 n 项和为 S ,公差为 d,若 n n S 0 B.a>0 1 C.S <0 D.S <0 22 21 三、填空题与解答题 11.(2024·陕西洛南中学高三月考)已知S 为等差数列{a}的前n项和,且S=35,a+ n n 2 2 a+a=39,则当S 取得最大值时,n的值为________. 3 4 n 12.已知A={x|2n,可得n<4 037,∴n的最大 n 值为4 036.故选C. 答案:C 6.设数列{a}的前n项和为S,且是等差数列,若a=3a,则=( ) n n 3 5 A. B. C. D. 解析:方法一:数列是等差数列,且首项为=a,设公差为d,则=a+(n-1)·d,S= 1 1 n na+n(n-1)d=n2d+(a-d)n,因为a=3a,所以S-S=3(S-S),则9d+3(a-d)-[4d 1 1 3 5 3 2 5 4 1 +2(a -d)]=3[25d+5(a -d)-16d-4(a -d)],即a =-10d,则S =n2d-11dn,则==. 1 1 1 1 n 故选C. 方法二:因为数列是等差数列,所以数列{a}是等差数列,则==×3=.故选C. n 答案:C an+1 an 7.(2024·辽宁实验中学等五校联考)已知数列{a}满足3 =9·3 (n∈N*),且a n 2 +a+a=9,则log (a+a+a )=( ) 4 6 1 9 11 \f(1,3 A.- B.3 C.-3 D. an+1 an an+1 an+2 解析:由题知,数列{a}满足3 =9·3 (n∈N*),可得3 =3 ,则a n n+1 =a +2,所以数列{a} 是等差数列,且公差d=2.由a +a +a =3a +9d=3a +9×2=9, n n 2 4 6 1 1 解得a=-3,所以log (a+a+a )=log (3a+18d)=log 27=-3,故选C. 1 1 9 11 1 \f(1,3 \f(1,3 \f(1,3 答案:C 8.(2024·福建三明一中期末)《九章算术》是我国古代的一本数学名著.全书有方田、 粟米、衰分、少广、商功、均输、盈不足、方程、勾股九章,收有 246个与生产、生活实 践有联系的应用问题.书中有这样一道题目“今有五人分五钱,令上二人所得与下三人等 问各得几何?”其意思为“现有五个人分 5钱,且较多的两份之和等于较少的三份之和, 问五人各得多少?”在此题中,若每人分得钱数成等差数列,则任意两人分得的最大差值 为( ) A. B. C. D. 解析:设每人分到的钱数构成的等差数列为{a},数列{a}的公差d>0,由题意可得, n n a +a +a =a +a ,S =5,故3a +3d=2a +7d,5a +10d=5,解得a =,d=,故任意两 1 2 3 4 5 5 1 1 1 1人分得的最大差值为4d=.故选B. 答案:B 9.设等差数列{a}的前n项和为S,若S =-2,S =0,S =3,则m=( ) n n m-1 m m+1 A.3 B.4 C.5 D.6 解析:∵数列{a}为等差数列,且前n项和为S, n n ∴数列也为等差数列. ∴+=, 即+=0, 解得m=5,经检验为原方程的解. 答案:C 二、多项选择题 10.(2024·河北石家庄期末)已知等差数列{a}的前 n 项和为 S ,公差为 d,若 n n S 0 B.a>0 1 C.S <0 D.S <0 22 21 解析:设等差数列{a}的首项为 a ,对于 A,B,因为 S 0,故等差数列的首项为负,公差为正,所以d>0,a<0,故A正确, 11 12 11 12 1 B错误;对于C,由S 0,所以S ==11(a +a )>0,故C错 10 12 12 10 12 11 22 11 12 误;对于D,因为a <0,所以S =21×=21a <0,故D正确.故选AD. 11 21 11 答案:AD 三、填空题与解答题 11.(2024·陕西洛南中学高三月考)已知S 为等差数列{a}的前n项和,且S=35,a+ n n 2 2 a+a=39,则当S 取得最大值时,n的值为________. 3 4 n 解析:方法一:设等差数列{a}的首项为a,公差为d,则由题意得 n 1 解得则S=19n+×(-3)=-n2+n=-2+.又n∈N*,∴当n=7时,S 取得最大值. n n 方法二:设等差数列{a}的首项为a ,公差为d.∵a +a +a =3a =39,∴a =13, n 1 2 3 4 3 3 ∴2a -S =(a -a)+(a -a)=3d=2×13-35=-9,解得d=-3,则a =a +(n-3)d=22 3 2 3 2 3 1 n 3 -3n,令解得≤n≤,又n∈N*,∴n=7,即数列{a}的前7项为正数,从第8项起各项均为 n 负数,故S 取最大值时,n=7. n 答案:7 12.已知A={x|2n5时,a<0, n 则T=|a|+|a|+…+|a| n 1 2 n =a+a+…+a-(a+a+…+a) 1 2 5 6 7 n =S-(S-S)=2S-S 5 n 5 5 n =2×(9×5-25)-(9n-n2)=n2-9n+40; 当n≤5时,a≥0, n 则T=|a|+|a|+…+|a| n 1 2 n =a+a+…+a=9n-n2, 1 2 n ∴T= n 高分推荐题 15.(2024·山东师大附中模拟)已知数列{a}为等差数列,其前n项和为S ,若a≠0, n n 1 S =0,则满足aS<0的正整数n的个数为( ) 16 n n A.6 B.7 C.8 D.9 解析:由a≠0,S =0知d≠0,则S =·16=8(a+a)=0,所以a+a=0, 1 16 16 8 9 8 9若d>0,则a<0,a>0,即当n≤8时,a<0,当n≥9时,a>0, 8 9 n n 又S =0,所以当n≤15时,S<0,当n≥17时,S>0, 16 n n 所以当9≤n≤15时,aS<0,满足条件的n有7个, n n 若d<0,同理可得,当9≤n≤15时,aS<0,满足条件的n有7个. n n 综上,当9≤n≤15时,aS<0,共有7个正整数满足题意,故选B. n n 答案:B
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  1. CONNECT:[ UseTime:0.000564s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000841s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000286s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000189s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000578s ]
  8. SELECT * FROM `wendang` WHERE `id` = 370187 LIMIT 1 [ RunTime:0.000423s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 370187 [ RunTime:0.002714s ]
  10. UPDATE `wendang` SET `lasttime` = 1773093013 WHERE `id` = 370187 [ RunTime:0.003765s ]
  11. SELECT * FROM `wendang` WHERE `id` < 370187 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000576s ]
  12. SELECT * FROM `wendang` WHERE `id` > 370187 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000443s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 370187 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001277s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 370187 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001756s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 370187 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005213s ]
0.089944s