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设等比数列的公比为q,前n项和为Sn,若Sn+1,Sn,Sn+2成等差数列,则q的值为 .
设等比数列的公比为q,前n项和为S??n,若Sn+1,S??n,Sn+2成等差数列,则q的值为_________
设等比数列的公比为q,前n项和为,若,,成等差数列,则公比q为( )
A. B. C. D.
设等比数列的公比为q,前n项和为Sn,若Sn+1,Sn,Sn+2成等差数列,则q的值为