\[\boxed{\text{739\ (739).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[Пусть\ вычитаемый\ многочлен\ \]
\[будет\ \text{M.}\]
\[\textbf{а)}\ y^{2} - 5y + 1 - M = 0\]
\[M = y^{2} - 5y + 1.\]
\[\textbf{б)}\ y^{2} - 5y + 1 - M = 5\]
\[M = y^{2} - 5y + 1 - 5\]
\[M = y^{2} - 5y - 4.\]
\[\textbf{в)}\ y^{2} - 5y + 1 - M = y^{2}\]
\[M = y^{2} - 5y + 1 - y^{2}\]
\[M = - 5y + 1.\]
\[\textbf{г)}\ y^{2} - 5y + 1 - M =\]
\[= 4y^{2} - y + 7\]