\[Страница\ 68.\]
\[\boxed{\mathbf{4.}}\]
\[360 \cdot 0,8 = 288{^\circ}.\]
\[360 \cdot 0,2 = 72{^\circ}\]
\[\boxed{\mathbf{5.}}\]
\[0,25 \cdot 360 = 90{^\circ}\]
\[0,55 \cdot 360 = 198{^\circ}\]
\[\boxed{\mathbf{6.}}\]
\[\textbf{а)}\ 22,5\]
\[\textbf{б)}\ 50\]
\[\textbf{в)}\ 600\]
\[\boxed{\mathbf{7.}}\]
\[\textbf{а)}\ 40\%\ от\ 10 = 10\%\ от\ 40\]
\[\textbf{б)}\ 20\%\ от\ 60 = 60\%\ от\ 20\]
\[\textbf{в)}\ 50\%\ от\ 48 = 48\%\ от\ 50\]
\[\textbf{г)}\ 70\%\ от\ 20 = 20\%\ от\ 70\ \]