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专练32数列求和命题范围:数列求和常用的方法.[基础强化]一、选择题1.若数列{an}的通项公式为an=2n+2n-1,则数列{an}的前n项和为()A.2n+n2-1B.2n+1+n2-1C.2n+1+n2-2D.2n+n-22.等差数列{an}的公差为2,若a2,
a4,a8成等比数列,则{an}的前n项和Sn=()A.n(n+1)B.n(n-1)C.n(n+1)2D.n(n-1)23.数列1,11+2,11+2+3,…,11+2+3+…+n,…的前n项和为()A.nn+1B.2nn+
1C.4nn+1D.n2(n+1)4.数列1n+1+n的前2018项的和为()A.2018+1B.2018-1C.2019+1D.2019-15.已知数列{an}满足an+1+(-1)n+1an=2,则其前100项和为()A.250B.200C.150D.1006.已知数列{a
n}满足:an+1=an-an-1(n≥2,n∈N*),a1=1,a2=2,Sn为数列{an}的前n项和,则S2018=()A.3B.2C.1D.07.[2022·陕西省西安中学三模]数列{an},{bn}满足anbn=1,an=n2+5
n+6,n∈N*,则{bn}的前10项之和为()A.413B.513C.839D.10398.已知数列{an}中,a1=a2=1,an+2=an+2,n是奇数,2an,n是偶数,则数列{an}的前20项和为
()A.1121B.1122C.1123D.11249.[2022·江苏模拟]已知等差数列{an}的前9项和为18,函数f(x)=(x-2)3+1,则f(a1)+f(a2)+…+f(a9)=()A.7B.8C.9D.10二、填空题10.设Sn为等差数列{an}的前n项和,已知a1+a3+
a11=6,则S9=________.11.设数列{an}满足a1=1,且an+1-an=n+1(n∈N*),则数列1an的前10项的和为________.12.在等差数列{an}中,已知a1+a3=0
,a2+a4=-2,则数列an2n-1的前10项和是________.[能力提升]13.已知数列{an}满足2an=an+1+an-1(n≥2,n∈N),且a1=1,a5=9,bn=Cn-199·an,则数列{bn}的前100项的和为()A.100×299B.100×2100C.50
×299D.50×210114.[2022·安徽省示范高中联考]已知数列{an}为等比数列,公比q≠1,a1=3,3a1,2a2,a3成等差数列,将数列{an}中的项按一定顺序排列成a1,a1,a2,a1,a2,a3,a1,a2,a3,a4,…的形式,记此数列为{bn}
,数列{bn}的前n项和为Sn,则S24的值是()A.1629B.1641C.1668D.174915.[2022·安徽省滁州市质检]已知数列{an}满足:a1=1,a2=4,4an+1-3an-an+
2=0,设bn=1log3(2an+1)log3(2an+1+1),n∈N*.则b1+b2+…+b2022=________.16.[2022·江西省赣州市一模]数列{an}满足an+an+1=n2·sinnπ2(n∈N*),若数列{an}前n项和为Sn,则S4
0=________.