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a1=S1=1^2=1 Sn=n^2 Sn-1=(n-1)^2 an=Sn-Sn-1 =n^2-(n-1)^2 =2n-1 n=1時,2n-1=1,同樣滿足. 數列{an}的通項公式為an=2n-1
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