\[\boxed{\mathbf{568}\mathbf{.}}\]
\[1)\arccos 0 = \frac{\pi}{2}\]
\[2)\arccos 1 = 0\]
\[3)\arccos\frac{\sqrt{2}}{2} = \frac{\pi}{4}\]
\[4)\arccos\frac{1}{2} = \frac{\pi}{3}\]
\[5)\arccos\left( - \frac{\sqrt{3}}{2} \right) =\]
\[= \pi - \arccos\frac{\sqrt{3}}{2} = \pi - \frac{\pi}{6} = \frac{5\pi}{3}\]
\[6)\arccos\left( - \frac{\sqrt{2}}{2} \right) =\]
\[= \pi - \arccos\frac{\sqrt{2}}{2} = \pi - \frac{\pi}{4} = \frac{3\pi}{4}\]