\[\boxed{\text{955.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ 3x² + 6xy + 3y² =\]
\[= 3 \cdot \left( x^{2} + 2xy + y^{2} \right) =\]
\[= 3 \cdot (x + y)²\]
\[\textbf{б)} - m^{2} + 2m - 1 =\]
\[= - \left( m^{2} - 2m + 1 \right) =\]
\[= - (m - 1)²\]
\[\textbf{в)} - 4x - 4 - x^{2} =\]
\[= - \left( 4x + 4 + x^{2} \right) = - (x + 2)²\]
\[\textbf{г)}\ 6p² + 24q² + 24pq =\]
\[= 6 \cdot \left( p^{2} + 4q^{2} + 4pq \right) =\]
\[= 6 \cdot (p + 2q)²\]
\[\textbf{д)}\ 45x + 30ax + 5a²x =\]
\[= 5x\left( 9 + 6a + a^{2} \right) = 5x(3 + a)²\]
\[\textbf{е)}\ 18cx² - 24cx + 8c =\]
\[= 2c\left( 9x^{2} - 12x + 4 \right) =\]
\[= 2c(3x - 2)²\]