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已知函数f (x)=,若f (x)在(-∞,+∞)上是增函数,则实数a的取值范围...
已知函数f (x)=
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,若f (x)在(-∞,+∞)上是增函数,则实数a的取值范围是( )
A.{a|
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}
B.{a|a≥2}
C.{a|a>
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}
D.{a|a=2}
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