广东省惠州市2019年高考数学复习专题等差数列练习(无答案)文.doc

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1、- 1 -等差数列时间:40 分钟考纲要求:1、理解等差数列的概念;2、掌握等差数列的通项公式及前 n项和为 nS;3、了解等差数列与一次函数的关系;4、等差数列的基本运算;5、等差数列的性质的应用。一、基础达标(等差数列的基本量运算、等差数列的性质)在等差数列 na中,等差数列 na的前 项和为 nS1、已知 10203,5.(1) 求 ; (2) 若 24,求2、已知 na是一个公差大于 0的等差数列,且满足 3627516aa,。(1)求数列 的通项公式;(2)求数列 n的前 项和。3、在等差数列 na中, 若 3673a则 2468a= ; 9S 二、典型例题4、数列 na满足 2,2

2、,11nnaa(1)设 nb,证明 b是等差数列;(2)求数列 na的通项公式.5、已知 nS为等差数列 na的前 项和, .16,2541a- 2 -当 n为何值时, nS取得最大值; 求 208642aa 的值;求数列 a的前 项和 .T三、高考达标1、若 20,865a,则 75 2、等差数列 n中,若 1425836939,aaa求 = nS为数列的前 项和,求 8S = 3、在等差数列 n中, 71,公差为 d,前 n项和为 nS,当且仅当 8时 n取最大值,则d的取值范围_.4、在等差数列 na中 7S, 15,求数列 nS的的前 n 项和 T。5、已知等差数列 na中, 2190,28a.求数列 的通项公式;若数列 nb满足 2lognnb,设 12nTb ,且 1T,- 3 -求 n的值.

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