1. \\( f(x) = x^5 \\) is order-preserving, but \\( f(x) = |x| \\) is not;
2. \\( f(x) = -x \\) is metric-preserving, but \\( f(x) = 1 \\) is not;
3. \\( f(x) = \frac{x}{2} \\) is addition-preserving, but \\( f(x) = |x| \\) is not.