\[\boxed{\text{950.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ 5x² - 5y^{2} = 5 \cdot \left( x^{2} - y^{2} \right) =\]
\[= 5 \cdot (x - y)(x + y)\]
\[\textbf{б)}\ am² - an^{2} = a\left( m^{2} - n^{2} \right) =\]
\[= a(m - n)(m + n)\]
\[\textbf{в)}\ 2ax² - 2ay^{2} =\]
\[= 2a\left( x^{2} - y^{2} \right) =\]
\[= 2a(x - y)(x + y)\]
\[\textbf{г)}\ 9p² - 9 = 9 \cdot \left( p^{2} - 1 \right) =\]
\[= 9 \cdot (p - 1)(p + 1)\]
\[\textbf{д)}\ 16x² - 4 = 4 \bullet \left( 4x^{2} - 1 \right) =\]
\[= 4 \bullet (2x - 1)(2x + 1)\]
\[\textbf{е)}\ 75 - 27c^{2} =\]
\[= 3 \cdot \left( 25 - 9c^{2} \right) =\]
\[= 3 \cdot (5 - 3c)(5 + 3c)\ \]