\[\boxed{\text{88\ (88).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ 4x^{2} - 6x + 2xy - 3y =\]
\[= 2x(2x - 3) + y(2x - 3) =\]
\[= (2x - 3)(2x + y).\]
\[\textbf{б)}\ 4a^{3} + 2b^{3} - 2a^{2}b - 4ab^{2} =\]
\[= 4a\left( a^{2} - b^{2} \right) - 2b\left( a^{2} - b^{2} \right) =\]
\[= \left( a^{2} - b^{2} \right)(4a - 2b) =\]
\[= 2 \cdot (2a - b)(a - b)(a + b)\]