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1. \\( f(x)=x\\) is order-preserving, \\(f(x)=-x\\) is not.
2. \\( f(x)=|x|\\) is metric-preserving, \\(f(x)=x^2\\) is not.
3. \\( f(x)=n*x\\) is addition preserving. \\(f(x)=-x^2\\) is not.
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