题目内容

设f(x)在(-∞，+∞)上可导，且对任意的x1和x2，当x1＞x2时都有f(x1)＞f(x2)，则______．

A. 对任意x，f’(x)＞0
B. 对任意x，f’(-x)≤0
C. 函数f(-x)单调增加
D. 函数-f(-x)单调增加

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