等差数列{an}前n项和Sn=-n²+n,求等差数列的首项

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等差数列{an}前n项和Sn=-n²+n,求等差数列的首项
等差数列{an}前n项和Sn=-n²+n,求等差数列的首项

等差数列{an}前n项和Sn=-n²+n,求等差数列的首项
等差数列的首项=s1=-1^2+1=0

a1=s1=1^2+1=2