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等差数列{an}的前n项和为Sn,且S3=6,a1=4,则公差d等于A.1B.C.-2D....
试题详情
等差数列{a
n}的前n项和为S
n,且S
3=6,a
1=4,则公差d等于( )
A.1
B.
C.-2
D.3
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