\(a,=\left|2\sqrt{2}-3\right|=3-2\sqrt{2}\\ b,=\left|\dfrac{1}{\sqrt{3}}-\dfrac{1}{3}\right|=\dfrac{1}{\sqrt{3}}-\dfrac{1}{3}=\dfrac{\sqrt{3}-1}{3}\\ c,=\left|0,2-\sqrt{0,2}\right|=0,2-\sqrt{0,2}=\dfrac{1}{5}-\dfrac{\sqrt{5}}{5}=\dfrac{1-\sqrt{5}}{5}\)