(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式. （注：式中...(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式.（注：式中的n,n-

(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式. （注：式中...(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式.（注：式中的n,n-
(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式. （注：式中...
(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式.
（注：式中的n,n-

(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式. （注：式中...(1/2)已知{an}的前n项和为Sn,a1=1.且3an-1+2Sn=3求a1,a2的值,并求数列{an}的通项公式.（注：式中的n,n-
首先,an=sn-s（n-1）,代入原式,
并移项得3sn-3s(n-1)+2sn=4,
5sn-3s(n-1)=45sn-10=3(n1)-6
5(sn-2)=3[s(n-1)-2]
故数列{sn-2}是首项
s1-2=a1-2=-1,公比为5/3的等比数列
由等比数列通项公式,sn-2=（-1）

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The shutdown also idled a state hotline set up apt assist seniors and their caregivers detect services, housing adoptions,Chad Ochocinco Black Cheap Jersey of Cincinnati Bengals No 85 discount, help with Medicaid and Medicare insurance and more. A phone to the 800 digit Friday got a recording mentioning callers could quit a information.
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a1=1,
a2=1/3
an=1/[3^(n-1)]

3an-1+2Sn=3 （1） 3an+2Sn+1=3 (2) (2)--(1) 得 2an+1+3an-an-1
特征方程2X^2+3X-3=0 得X1，X2，
则an=a*x1^(n-1)+b*x2^(n-1)
a1=1,a2=-1
1=a+b,-1=a*x1+b*x2.
得a，b。