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已知数列{an}的前n项和为Sn,a1=3且an+1=2Sn+3,数列{bn}为等差数列,...
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已知数列{a
n}的前n项和为S
n,a
1=3且a
n+1=2S
n+3,数列{b
n}为等差数列,且公差d>0,b
1+b
2+b
3=15;
(1)求数列{a
n}的通项公式;
(2)若
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)
成等比数列,求数列{b
n}的前项和T
n.
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