已知數(shù)列{an}的前n項(xiàng)和為Sn,Sn=2an+2n-5(n∈N*),公差不為0的等差數(shù)列{bn}滿足b1=1,b2b3=b8
(1)證明:數(shù)列{an-2}為等比數(shù)列.
(2)記cn=bn(an+1-2),求數(shù)列{cn}的前n項(xiàng)和Tn.
S
n
=
2
a
n
+
2
n
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5
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n
∈
N
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【考點(diǎn)】錯(cuò)位相減法.
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發(fā)布:2024/6/27 10:35:59組卷:165引用:2難度:0.7
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