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若,对任意实数都有,且,则实数 的值等于 ( ) A.±1 B.±3 C.-3...

 若6ec8aac122bd4f6e,对任意实数6ec8aac122bd4f6e都有6ec8aac122bd4f6e,且6ec8aac122bd4f6e,则实数6ec8aac122bd4f6e

    的值等于                                                             (    )

 A.±1         B.±3               C.-3或1       D.-1或3

 

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