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函数f(x)的定义域为D,若满足①f(x)在D内是单调函数,②存在[m,n]⊆D...
函数f(x)的定义域为D,若满足①f(x)在D内是单调函数,②存在[m,n]⊆D,使f(x)在[m,n]上的值域为
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,那么就称y=f(x)为“好函数”.现有f(x)=log
a(a
x+k),(a>0,a≠1)是“好函数”,则k的取值范围是( )
A.(0,+∞)
B.
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C.
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D.
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考点分析:
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已知当
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B.
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