$a)\left|3\right|=3$

$b)\left|-7\right|=7$

$c)\left|5-\sqrt{5}\right|=5-\sqrt{5}\left(\text{bo}5=\sqrt{25},\text{więc}5-\sqrt{5}>0\right)$

$d)\left|\frac{1}{2}-\sqrt{\frac{1}{2}}\right|=-\left(\frac{1}{2}-\sqrt{\frac{1}{2}}\right)=-\frac{1}{2}+\frac{\sqrt{1}}{2}\left(\text{bo}\frac{1}{2}=\sqrt{\frac{1}{4}},\frac{1}{4}<\frac{1}{2},\text{więc}\frac{1}{2}<\sqrt{\frac{1}{2}}\right)$

$e)\left|\frac{1}{3}-\frac{1}{2}\right|=\left|\frac{2}{6}-\frac{3}{6}\right|=\left|-\frac{1}{6}\right|=\frac{1}{6}$

$f)\left|\frac{1}{3}-\frac{1}{\pi }\right|=\left|\frac{\pi }{3\pi }-\frac{3}{3\pi }\right|=\left|\frac{\pi -3}{3\pi }\right|\stackrel{{}^{\left(\pi \approx 3.14,\text{więc}\frac{\pi -3}{3\pi }>0\right)}}{=}\frac{\pi -3}{3\pi }=\frac{\pi }{3\pi }-\frac{3}{3\pi }=\frac{1}{3}-\frac{1}{\pi }$