\[\boxed{\mathbf{568\ (568).}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 9x = 5\]
\[x = 5\ :9\]
\[x = 0,(5)\]
\[x \approx 0,56.\]
\[2)\ 8\ :x = 125\]
\[x = 8\ :125\]
\[x = 0,064\]
\[x \approx 0,06.\]
\[3)\ 3x = 4\]
\[x = 4\ :3\]
\[x = 1,(3)\]
\[x \approx 1,33.\]
\[4)\ \frac{2}{7}x = 1\frac{1}{6}\]
\[x = \frac{7}{6}\ :\frac{2}{7}\]
\[x = \frac{7 \cdot 7}{6 \cdot 2}\]
\[x = \frac{49}{12}\]
\[x = 4,08(3)\]
\[x \approx 4,08.\]