\[\boxed{\text{695.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ 16m^{2} - 25n^{4} =\]
\[= \left( 4m - 5n^{2} \right)\left( 4m + 5n^{2} \right)\]
\[\textbf{б)}\ 0,09a^{4} - 9b^{2} =\]
\[= (0,3a^{2} - 3b)(0,3a^{2} + 3b)\]
\[\textbf{в)}\ (2a + 3)^{2} - 4 =\]
\[= (2a + 3 - 2)(2a + 3 + 2) =\]
\[= (2a + 1)(2a + 5)\]
\[\textbf{г)}\ 36 - (1 - 5x)^{2} =\]
\[= \left( 6 - (1 - 5x) \right)(6 + 1 - 5x) =\]
\[= (5 + 5x)(7 - 5x)\]