\[\boxed{\text{593.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ 17a^{4} - 8a^{5} + 3a - a^{3} - 1 =\]
\[= - 8a^{5} + 17a^{4} - a^{3} + 3a - 1\]
\[\textbf{б)}\ 35 - c^{6} + 5c^{2} - c^{4} =\]
\[= - c^{6} - c^{4} + 5c^{2} + 35\]
\[\boxed{\text{593\ (593).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ M + \left( 5x^{2} - 2xy \right) =\]
\[= 6x^{2} + 9xy - y^{2}\]
\[= x^{2} - y^{2} + 11xy\]
\[M = x^{2} + 11xy - y^{2}.\]
\[\textbf{б)}\ M - \left( 4ab - 3b^{2} \right) =\]
\[= a^{2} - 7ab + 8b^{2}\]
\[= a^{2} - 3ab + 5b^{2}\]
\[M = a^{2} - 3ab + 5b^{2}.\]
\[\textbf{в)}\ \left( 4c^{4} - 7c^{2} + 6 \right) - M = 0\ \]
\[M = 4c^{4} - 7c^{2} + 6\]