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函数在区间上的单调递减区间是 ( ) A. B. C. D.

函数6ec8aac122bd4f6e在区间6ec8aac122bd4f6e上的单调递减区间是                           (    )

    A.6ec8aac122bd4f6e                         B.6ec8aac122bd4f6e

    C.6ec8aac122bd4f6e D.6ec8aac122bd4f6e

 

D 【解析】略
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