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.对任意正整数x,y都有,且则= ( ) A. B. C. D.

.对任意正整数x,y都有6ec8aac122bd4f6e,且6ec8aac122bd4f6e6ec8aac122bd4f6e=                             (    )

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

 

A 【解析】略
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