\[\boxed{\text{629.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ 4x² - 6x + 2xy - 3y =\]
\[= 2x(2x - 3) + y(2x - 3) =\]
\[= (2x - 3)(2x + y).\]
\[\textbf{б)}\ 4a³ + 2b³ - 2a^{2}b - 4ab^{2} =\]
\[= 4a\left( a^{2} - b^{2} \right) - 2b\left( a^{2} - b^{2} \right) =\]
\[= \left( a^{2} - b^{2} \right)(4a - 2b) =\]
\[= 2 \cdot (2a - b)(a - b)(a + b).\]