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已知四個(gè)實(shí)數(shù)成等差數(shù)列，五個(gè)實(shí)數(shù)成等比數(shù)列，則的值等于                                       

A.                    B. 8               C.          D.

已知四個(gè)實(shí)數(shù)成等差數(shù)列，五個(gè)實(shí)數(shù)成等比數(shù)列，

  則的值為....................................................................................................   （　　）

A．                       B．                     C．                    D．

已知四個(gè)實(shí)數(shù)成等差數(shù)列，五個(gè)實(shí)數(shù)成等比數(shù)列，則的值等于                                       

A．

B．8

C．

D．

已知四個(gè)實(shí)數(shù)成等差數(shù)列，－4，b₁，b₂，b₃，－1五個(gè)實(shí)數(shù)成等比數(shù)列，則=  （    ） 

A. 1           B .2           C .－1          D .±1