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