2019高考数学二轮复习大题专项练习(二)数列(无答案)理.doc

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1、1大题专项练习(二) 数列12018全国卷记 Sn 为等差数列an的前 n 项和,已知 a17,S315.(1)求an的通项公式;(2)求 Sn,并求 Sn 的最小值22018华中师范大学 5 月押题卷已知正项等比数列a n满足:a 4a 2a3,前三项和 S313.(1)求 an;(2)若数列b n满足:b n log3ann, 的前 n 项和为 Tn,求 Tn.1bnbn 132018揭阳三中月考已知公差不为 0 的等差数列a n的前 n 项和为 Sn,S 770,且 a1,a 2,a 6成等比数列(1)求数列a n的通项公式;(2)设 bn ,数列b n的最小项是第几项,并求出该项的值2

2、Sn 48n234.2018黄冈中学第三次模拟考试数列a n的前 n 项和 Sn n2 ,数列b n满足32 n2an3 log2bn1(nN *)(1)求数列 an, bn的通项公式;(2)求 anbn的前 n 项和 Tn.52018康杰中学模拟试题已知数列 an满足 an22cos 2 , nN *,等差数列n2bn满足 a12 b1, a2 b2.(1)记 cn a2n1 b2n1 a2nb2n,求数列 cn的通项公式 cn;(2)求数列 anbn的前 2n 项和 S2n.462018山东潍坊第三次模拟已知数列 an的前 n 项和为 Sn, a11, an1 Sn1.(1)求 an的通项公式;(2)记 bnlog 2(anan1 ),数列 bn的前 n 项和为 Tn,求证: 2.1T1 1T2 1Tn

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