1) Simplify the rational expression: $\frac{3x^2 - 6x}{2x^3 - 4x^2}$

2) Simplify the rational expression: $\frac{4x^3 - 8x^2}{2x^2 - 4x}$

3) Simplify the rational expression: $\frac{5x^2 - 10x + 5}{x^2 - 4}$

4) Simplify the rational expression: $\frac{6x^3 - 12x^2 + 6x}{3x^2 - 6x}$

5) Simplify the rational expression: $\frac{2x^3 - 4x^2 + 2x}{x^3 - 2x^2}$

6) Simplify the rational expression: $\frac{9x^2 - 18x + 9}{3x^2 - 6x + 3}$

7) Simplify the rational expression: $\frac{8x^3 - 16x^2 + 8x}{4x^2 - 8x}$

8) Simplify the rational expression: $\frac{7x^2 - 14x + 7}{x^2 - 1}$

9) Simplify the rational expression: $\frac{10x^3 - 20x^2 + 10x}{5x^2 - 10x}$

10) Simplify the rational expression: $\frac{3x^3 - 6x^2 + 3x}{x^3 - x^2}$