已知成等差数列，成等比数列，则b2(a2-a1)=（   ）                         ...

问题详情：

已知成等差数列，成等比数列，则b2(a2-a1)= （    ）                                                                                                             

   A.8            B.-8            C.±8         D.

【回答】

 B                                                                                               

知识点：数列

题型：选择题