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对任意正整数x,y都有,且则= ( ) A. B. C. D.[来源:

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

                                                                              (    )

    A.6ec8aac122bd4f6e B.6ec8aac122bd4f6e C.6ec8aac122bd4f6e D.6ec8aac122bd4f6e[来源:

 

A 【解析】略
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