$\displaystyle \frac{x}{2}$\displaystyle \frac{x}{2}

$\displaystyle \frac{x}{4}$\displaystyle \frac{x}{4}

$\displaystyle \frac{x}{2x+4}$\displaystyle \frac{x}{2x+4}

$\displaystyle \frac{x^3+3x^2}{6x^2+24x+24}$\displaystyle \frac{x^3+3x^2}{6x^2+24x+24}