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若f(x)=,则f(x)的定义域为( ) A.(,0) B.(,0] C.(,+...
若f(x)=
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,则f(x)的定义域为( )
A.(
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,0)
B.(
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,0]
C.(
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,+∞)
D.(0,+∞)
考点分析:
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