Fraction Rules
$\frac{0}{a}=0$ $a\ne 0$$\frac{a}{0}=$ undefined (Division by zero is not allowed.)
$\frac{a}{a}=1$
$(\frac{a}{b})^{-1}=\frac{1}{\frac{a}{b}}=\frac{b}{a}$
$(\frac{a}{b})^{-c}=((\frac{a}{b})^{-1})^{c}=(\frac{b}{a})^{c}$
$a^{-1}=\frac{1}{a}$
$a^{-b}=\frac{1}{a^b}$
$\frac{-a}{-b}=\frac{a}{b}$
$\frac{-a}{b}=-\frac{a}{b}$
$\frac{a}{-b}=-\frac{a}{b}$
$\frac{a}{\frac{b}{c}}=\frac{a\cdot c}{b}$
$\frac{\frac{b}{c}}{a}=\frac{b}{c \cdot a}$
$\frac{1}{\frac{b}{c}}=\frac{c}{b}$