已知數(shù)列{an}、{bn}滿足a1a2a3?an=3bn,若數(shù)列{an}是等比數(shù)列且a1=3,b4=4+b3.
(1)求數(shù)列{an}、{bn}的通項(xiàng)公式;
(2)令cn=2bn(n+1)an,求{cn}的前n項(xiàng)和為Sn.
a
1
a
2
a
3
?
a
n
=
3
b
n
2
b
n
(
n
+
1
)
a
n
【考點(diǎn)】錯位相減法.
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【解答】
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發(fā)布:2024/12/6 20:30:1組卷:179引用:3難度:0.6
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