\[\boxed{\mathbf{648\ (648).\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ x² - 7|x| = 0\]
\[Ответ:x = 0;\ x = - 7;x = 7.\]
\[2)\ x² - 6|x| + x = 0\]
\[Ответ:x = 0;x = 5;\ x = - 7.\]
\[3)\ 2x² - \frac{3x^{2}}{|x|} = 0\]
\[Ответ:x = 1,5;\ x = - 1,5.\]