$\displaystyle -5 \cdot \frac{a}{b}$\displaystyle -5 \cdot \frac{a}{b}

$\displaystyle \left( \frac{b}{a} \right)^5$\displaystyle \left( \frac{b}{a} \right)^5

$\displaystyle \frac{b^5}{a}$\displaystyle \frac{b^5}{a}

$\displaystyle -\left( \frac{a}{b} \right)^5$\displaystyle -\left( \frac{a}{b} \right)^5