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**HSS8** $\displaystyle \frac {y^2}{y^2-9} + \frac {9-6y}{y^2-9} $

$\displaystyle \frac {3x}{x^2-4} + \frac {5x}{x^2+x-2} - \frac {3}{x^2-4x+4}$

Complex Fraction: $\displaystyle \frac{\frac {x+2}{x-2}- \frac {x-2}{x+2}}{\frac {x-2}{x+2} + \frac {x+2}{x-2}}$

Complex Fraction **(-1)(-2) are negative powers**: $\displaystyle \frac {3a^-1}{4a^-2} \frac {+3b^-1}{-9b^-2}$

Complex Fraction: $\displaystyle \frac{\frac {2}{a^2} - \frac {1}{ab}- \frac {1}{b^2}}{\frac {1}{a^2} - \frac {3}{ab} + \frac {2}{a^2b^2}}$

Sorry, I didn't know how to make a complex fraction