已知数列{an}的前n项和Sn满足Sn=a(Sn-an+1)(a为常数,且a≠0,a≠1)
2个回答
Sn=a(Sn-an+1)
Sn-1=a(Sn-1-an-1+1)
两式相减得
an=a(an-an+an-1)
an=aan-1为等比数列
S1=a1=a(a1-a1+1)=a
所以an=a^n
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