lgbn=λlgan, 于是=== 查看更多

 

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設(shè)各項(xiàng)均為正數(shù)的數(shù)列{an}和{bn}滿足,,成等比數(shù)列,lgbn,lgan+1,lgbn+1成等差數(shù)列,且a1=1,b1=2,a2=3,求an,bn.

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設(shè)各項(xiàng)均為正數(shù)的數(shù)列{an}和{bn}滿足5an,5bn,5an+1成等比數(shù)列,lgbn,lgan+1,lgbn+1成等差數(shù)列,且a1=1,b1=2,a2=3,求通項(xiàng)an、bn

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設(shè)數(shù)列{an},{bn}都是正項(xiàng)等比數(shù)列,Sn,Tn分別為數(shù)列{lgan}與{lgbn}的前n項(xiàng)和,且
Sn
Tn
=
n
2n+1
,則logb5a5=
9
19
9
19

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設(shè)各項(xiàng)均為正數(shù)的數(shù)列{an}和{bn}滿足5an,5bn,5an+1成等比數(shù)列,lgbn,lgan+1,lgbn+1成等差數(shù)列,且a1=1,b1=2,a2=3,求通項(xiàng)an、bn

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設(shè)各項(xiàng)均為正數(shù)的數(shù)列{an}和{bn}滿足,,成等比數(shù)列,lgbn,lgan+1,lgbn+1成等差數(shù)列,且a1=1,b1=2,a2=3,求通項(xiàng)an、bn

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