Which of the following functions has an inverse function?
A、f:Z->N,f(x)=x²;
B、f:Z->N,f(x)=|x|;
C、f:N->Z,f(x)=x;
D、f:N->N,f(x)=x
发布时间：2025-11-19 19:21:40
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答案：f:N->N, f(x)=x
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