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设,则是奇函数的充要条件是( ) A. B. C. D.

6ec8aac122bd4f6e,则6ec8aac122bd4f6e是奇函数的充要条件是(    )

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

 

A 【解析】所以;, 即,所以,故选A。
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