Let \( A=\{x \in R: x \) is not a positive integer \( \} \). Define a function \( f: A \rightarr...

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Let \( A=\{x \in R: x \) is not a positive integer \( \} \). Define a function \( f: A \rightarrow R \) as \( f(x)=\frac{2 x}{x-1} \), then \( f \) is:
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