数列求和练习题
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一、选择题
1.已知数列{an}的前n项和Sn=an2+bn(a、b∈R),且S25=100,则a12+a14等于( )
(A)16 (B)8 (C)4 (D)不确定
2.若数列{an}的前n项和为Sn,且Sn=2n-1,则 + +…+ 等于( )
(A) (B) (C)2n-1 (D)
3. + + +…+ 等于( )
(A) (B) (C) (D)
...点击查看全部>>
1.已知数列{an}的前n项和Sn=an2+bn(a、b∈R),且S25=100,则a12+a14等于( )
(A)16 (B)8 (C)4 (D)不确定
2.若数列{an}的前n项和为Sn,且Sn=2n-1,则 + +…+ 等于( )
(A) (B) (C)2n-1 (D)
3. + + +…+ 等于( )
(A) (B) (C) (D)
...点击查看全部>>
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高三数学（文）二轮专题小测：不等式
资料ID:24162陕西省/模拟题/高考/数学
【2015天津文12】已知 则当a的值为 时， 取得最大值．...
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