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函数f(x)=+lg(3x+1)的定义域是( ) A.(-,+∞) B.(-,1...
函数f(x)=
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+lg(3x+1)的定义域是( )
A.(-
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,+∞)
B.(-
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,1)
C.(-
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,
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)
D.(-∞,-
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)
考点分析:
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