\[\boxed{\text{632\ (632).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1) - 8x + 16 + x^{2} = (x - 4)²\]
\[2)\ a^{8} + 4a^{4}b³ + 4b^{6} =\]
\[= (a^{4} + 2b^{3})²\]
\[3)\ 2x - 25 - 0,04x² =\]
\[= - \left( 0,04x^{2} - 2x + 25 \right) =\]
\[= - (0,2x - 5)²\]
\[4)\ 25m² - 15mn + 9n^{2} \Rightarrow\]
\[\Rightarrow невозможно,\ так\ как\]
\[\ (5m)^{2} + (3n)^{2} - 30mn\]
\[5)\ 81c² - 54b^{2}c + 9b^{2} \Rightarrow\]
\[\Rightarrow невозможно,\ так\ как\ \]
\[(9c)^{2} + (3b)^{2} - 54bc\]
\[6)\ b^{10} - a^{2}b^{5} + 0,25a^{4} =\]
\[= (b^{5} - 0,5a^{2})²\]
\[7)\frac{1}{16}x² - xy + 4y^{2} =\]
\[= \left( \frac{1}{4}x - 2y \right)^{2}\]
\[8) - \frac{9}{64}n^{6} - 3mn^{5} - 16m^{2}n^{4} =\]
\[= - \left( \frac{9}{64}n^{6} + 3mn^{5} + 16m^{2}n^{4} \right) =\]
\[= - \left( \frac{3}{8}n^{3} + 4mn^{2} \right)^{2}\]