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已知(z-x)2=4(x-y)(y-z),则 ( ) A.x,y,z成等差数列 ...

已知(z-x)2=4(x-y)(y-z),则                           (    )                                             

A.x,y,z成等差数列                                    B.x,y,z成等比数列 

C.6ec8aac122bd4f6e成等差数列                               D.6ec8aac122bd4f6e成等比数列

 

 

C 【解析】an=    当a=0时,数列为-1,0,0,……;当a=1时,数列为0,0,0  ……;当a0.a1时,an=(a-1)an-1,为等比数列.
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