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已知是公差不为0的等差数列的前项和,且成等比数列, 则等于 ( ) A. 4 ...

 已知6ec8aac122bd4f6e是公差不为0的等差数列6ec8aac122bd4f6e的前6ec8aac122bd4f6e项和,且6ec8aac122bd4f6e成等比数列,

6ec8aac122bd4f6e等于                                                (   )

A. 4                B. 6            C.8               D.10

 

 C   
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若集合6ec8aac122bd4f6e,其中6ec8aac122bd4f6e,且6ec8aac122bd4f6e。如果6ec8aac122bd4f6e,且6ec8aac122bd4f6e中的所有元素之和为403.(1)求6ec8aac122bd4f6e;(2)求集合6ec8aac122bd4f6e

 

 

 

 

 

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