\[\boxed{\text{1090\ (1090).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ xy² < x\]
\[\textbf{б)}\ y² - x^{2}y + 2x^{2} > 2y\]
\[\textbf{в)}\ x³ + xy² - 4x \leq 0\]
\[\textbf{г)}\ x²y + y³ - y \geq 0\]