\[\boxed{\mathbf{617\ (617).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 6x² + 7x + 2 = 0\]
\[2)\ x² - 8x - \frac{1}{3} = 0\]
\[3) - 0,5x^{2} + 2\frac{3}{7} = 0\]
\[4)\ 7,2x² - 2x = 0\]