\[\boxed{\text{594.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ x^{4} - 5 - x^{2} + 12x =\]
\[= - 5 + 12x - x^{2} + x^{4}\]
\[\textbf{б)}\ 2y + y³ - y^{2} + 1 =\]
\[= 1 + 2y - y^{2} + y³\]
\[\boxed{\text{594\ (594).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[Обозначим\ искомый\ \]
\[многочлен\ через\ M.\]
\[\textbf{а)}\ M + 5x^{2} - 3x - 9 = 0\]
\[M = - 5x^{2} + 3x + 9\]
\[\textbf{б)}\ M + 5x^{2} - 3x - 9 = 18\]
\[M = - 5x^{2} + 3x + 27\]
\[\textbf{в)}\ M + 5x^{2} - 3x - 9 = 2x - 3\]
\[M = - 5x^{2} + 5x + 6\]
\[\textbf{г)}\ M + 5x^{2} - 3x - 9 =\]
\[= x^{2} - 5x + 6\]
\[M = - 4x^{2} - 2x + 15\]