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湖南师大附中等差数列练习题(有答案)
时间:2023-03-12 01:23:05 下载该word文档
一、等差数列选择题1.已知数列an的前n项和为Sn,a11,n2且nN*,满足an2SnSn10,21数列的前n项和为Tn,则下列说法中错误的是()
Sn1A.a2
4C.数列SnSn1Sn2的最大项为211B.S6S4S87
12D.2Tnn1nTnTn1nn1D.16
2.等差数列an中,已知a1a4a739,则a4()A.13B.14C.153.设Sn是等差数列an的前n项和.若a1a4a76,则S7()A.10
B.8C.12D.14
4.等差数列{an}的公差为2,若a2,a4,a8成等比数列,则S9()A.72B.90C.36D.45
5.已知数列an的前n项和为Sn,a15,且满足an1an2,若p,2n52n7D.0
qN*,pq,则SpSq