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等差数列{an}的前n项和为Sn,已知,S2m-1=38,则m=A.9B.10C.20D....
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等差数列{a
n}的前n项和为S
n,已知
,S
2m-1=38,则m=( )
A.9
B.10
C.20
D.38
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