\[\boxed{\text{952.}\text{\ }еуроки - ответы\ на\ пятёрку}\]
\[\textbf{а)}\ mx² - 49m = m\left( x^{2} - 49 \right) =\]
\[= m(x - 7)(x + 7)\]
\[\textbf{б)}\ ab² - 4ac^{2} = a\left( b^{2} - 4c^{2} \right) =\]
\[= a(b - 2c)(b + 2c)\]
\[\textbf{в)}\ 4b³ - b = b\left( 4b^{2} - 1 \right) =\]
\[= b(2b - 1)(2b + 1)\]
\[\textbf{г)}\ a³ - ac^{2} = a\left( a^{2} - c^{2} \right) =\]
\[= a(a - c)(a + c)\ \]