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数列{an}的通项公式是an=(n∈N*),若前n项的和为,则项数为A.12B.11C.1...
试题详情
数列{a
n}的通项公式是a
n=
(n∈N*),若前n项的和为
,则项数为( )
A.12
B.11
C.10
D.9
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