等差数列{an}是公差d
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等差数列{an}是公差d等差数列{an}是公差d等差数列{an}是公差dS3=3a1+3dS8=8a1+28dS3=S85a1+25d=0a1=-5d∴a6=a1+5d=0a7=a1+6d=dS6=S
等差数列{an}是公差d
等差数列{an}是公差d
等差数列{an}是公差d
S3=3a1+3d
S8=8a1+28d
S3=S8
5a1+25d=0
a1=-5d
∴a6=a1+5d=0
a7=a1+6d=d<0
S6=S5+a6=S5+0=S5
Sn取得最大值的项数是5或6
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