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已知等差数列的公差为2,若成等比数列, 则= ( )
A –4 B –6 C –8 D –10
已知等差数列的公差为2,若成等比数列,则a2=( )
A.-4 B.-6 C.-8 D.-10
已知等差数列的公差为2,若成等比数列, 则=( )
A. B. C. D.
已知等差数列的公差为2,若成等比数列, 则=( )
A.–4 B.–6 C.–8 D.–10
已知等差数列的公差为2,若成等比数列, 则= ( )
A.–4 B.–6 C.–8 D.–10