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两个等差数列,的前n项和分别为,且则( ) A. B. C. D.

 两个等差数列6ec8aac122bd4f6e,6ec8aac122bd4f6e的前n项和分别为6ec8aac122bd4f6e,且6ec8aac122bd4f6e6ec8aac122bd4f6e(      )

A.6ec8aac122bd4f6e                 B.6ec8aac122bd4f6e             C.6ec8aac122bd4f6e             D.6ec8aac122bd4f6e

 

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