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【题目】函数yf(x)R上为增函数,且f(2m)>f(m9),则实数m的取值范围是(  )

A. (,-3) B. (0,+∞)

C. (3,+∞) D. (,-3)(3,+∞)

【答案】C

【解析】因为函数yf(x)R上为增函数,且f(2m)>f(-m+9),所以2m>-m+9,即m>3.

故选C.

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Paragraph outline

Supporting Details

Communication begins with the self

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Communication

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everywhere

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