51问答网 > 高一数学，关于数列的，这道题帮我看一下，我懂了，立刻采纳！

高一数学，关于数列的，这道题帮我看一下，我懂了，立刻采纳！

2025-04-01 18:16:05
推荐回答（1个）
回答1：

(2) n>1
Sn-S(n-1)=(an-1)/3-(a(n-1)-1)/3
an=(an-1)/3-(a(n-1)-1)/3
==>3an=an-a(n-1)
==>2an=-a(n-1)
==>an/a(n-1)=-1/2=q
a1=-1/2
an=a1*q^(n-1)=-(1/2)*(-1/2)^(n-1)=(-1/2)^n

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