\[\boxed{\text{962.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ x² - y^{2} - x - y =\]
\[= (x - y)(x + y) - (x + y) =\]
\[= (x + y)(x - y - 1)\]
\[\textbf{б)}\ a² - b^{2} - a + b =\]
\[= (a - b)(a + b) - (a - b) =\]
\[= (a - b)(a + b - 1)\]
\[\textbf{в)}\ m + n + m² - n^{2} =\]
\[= (m + n) + (m - n)(m + n) =\]
\[= (m + n)(1 + m - n)\]
\[\textbf{г)}\ k² - k - p^{2} - p =\]
\[= (k - p)(k + p) - (k + p) =\]
\[= (k + p)(k - p - 1)\]