设f(x)和g(x)在(-∞,+∞)内可导,且f(x)<g(x),则必有(  )

Loveyou2020-05-20  19

问题 设f(x)和g(x)在(-∞,+∞)内可导,且f(x)<g(x),则必有(  ).A.f(-x)>g(-x)B.f′(x)<g′(x)

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答案C

解析因为f(x)、g(x)均可导,[img]/upload/tiku/479/2052637_1.JPG[/img]
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