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

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 在等差数列{an}中,若a1>0,d0,d=0 和a(n+1) 等差数列{an},a1>0,d 等差数列{An}中,a1 等差数列{an}a1 等差数列{an}中,a1 等差数列{an}中,a1 等差数列{An}中,a1 等差数列{An}中,A1 等差数列an中,a1 等差数列{an}中,a1 等差数列{an}中,a1 等差数列an中,a1 等差数列{an}中,a1 已知{an}是等差数列,且公差d0 又a1,a2,a4 依次成等比数列,则（a1+a4+a10）/（a2+a4+a7）=?D不等于0 在等差数列{an}中,a1>0,a10a11 等差数列｛an｝,a1>0,a10×a11 在等差数列{an}中,a1>0,a10a11