\[\boxed{\mathbf{622\ (622).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ \frac{1}{6}x² - 2x - 3 = 0\ \ \ | \cdot 6\]
\[x² - 12x - 18 = 0\]
\[2) - 4x^{2} + 20x - 16 =\]
\[= 0\ \ \ |\ :( - 4)\]
\[x^{2} - 5x + 4 = 0\]
\[3)\ 3x² + x + 2 = 0\ \ \ \ |\ :3\]
\[x^{2} + \frac{1}{3}x + \frac{2}{3} = 0\]
\[\boxed{\mathbf{62}\mathbf{2}\mathbf{\text{.\ }}Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 1 < \sqrt{3} < 2\]
\[2)\ 3 < \sqrt{13} < 4\]
\[3)\ 0 < \sqrt{0,98} < 1\]
\[4)\ 7 < \sqrt{59} < 8\]
\[5) - 11 < - \sqrt{115} < - 10\]
\[6) - 9 < - \sqrt{76,19} < - 8\]