4.已知等差数列= ( ) A.-4 B.-6 C.-8 D.-10 查看更多

 

题目列表(包括答案和解析)

已知等差数列的公差为,且,若,则为         (    )

       A.12                      B.8                        C.6                        D.4

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已知等差数列的公差为,且,若,则

                                                                                                                                                                        (    )

         A.12                              B.8                                C.6                                D.4

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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

 

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已知等差数列{}的前3项分别为2、4、6,则数列{}的第4项为

A.7                                    B.8

C.10                                   D.12

 

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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

 

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