等差数列{An},A1>0,d0,An+1题目改一下“又有Sn>0,Sn+1
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等差数列{An},A1>0,d0,An+1题目改一下“又有Sn>0,Sn+1
等差数列{An},A1>0,d0,An+1
题目改一下“又有Sn>0,Sn+1
等差数列{An},A1>0,d0,An+1题目改一下“又有Sn>0,Sn+1
(1)S3为前n项和最大值,
∴S3>S2,S3>S4,
∴A3>0>A4,n=3.
(2)A1+2d>0>A1+3d,
∴-A1/2
等差数列{An},A1>0,d0,An+1题目改一下“又有Sn>0,Sn+1
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