Упростите: 1) $$ \frac{\frac{x}{3} + \frac{x-2}{4}}{\frac{5}{5-2} - \frac{y+2}{5}}$$ 2) $$ \frac{4}{2x-1} - \frac{x+2}{6}$$ 3) $$ \frac{3}{c+3} - \frac{1}{c}$$ 4) $$ \frac{a}{2x} \cdot \frac{x}{a} \cdot \frac{8x}{a}$$ 5) $$ y^2+3y \cdot \frac{4}{2y+6} \cdot \frac{y}{gy}$$ 6) $$ \frac{4}{y^2-9} \cdot \frac{gy^2}{y-3}$$ 7) $$ \frac{3x}{b} : \frac{b^3}{a^3}$$ 8) $$ -\frac{2x}{4} : \frac{6x^3}{y^2a^2}$$ 9) $$ \frac{xy+y^2}{a-3b} : \frac{x^2-y^2}{2a-6b}$$ 10) $$ \frac{1}{a+b} + \frac{a-b}{3a-b} \cdot \frac{x^2-y^2}{2x+y}$$ 11* $$x$$