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数列{an}是首项a1=4的等比数列,且4a1,a5,-2a3成等差数列,则其公比为A.1...
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数列{a
n}是首项a
1=4的等比数列,且4a
1,a
5,-2a
3成等差数列,则其公比为( )
A.1
B.-1
C.1或-1
D.
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数列{an}是首项a1=4的等比数列,且4a1,a5,-2a3成等差数列,则其公比为( )
A.1
B.-1
C.1或-1
D.
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(1)求公比q的值;
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已知数列{an}是首项为a1=4,公比q≠1的等比数列,Sn是其前项和,且4a1,a5,-2a3成等差数列.
(1)求公比q的值;
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已知数列{an}是首项为a1=4,公比q≠1的等比数列,Sn是其前项和,且4a1,a5,-2a3成等差数列.
(1)求公比q的值;
(2)设An=S1+S2+S3+…+Sn,求An.
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已知数列{an}是首项为a1=4,公比q≠1的等比数列,Sn是其前项和,且4a1,a5,-2a3成等差数列.
(1)求公比q的值;
(2)设An=S1+S2+S3+…+Sn,求An.