[tex]a)\\(a^{-4}\cdot b^{-3}\cdot c^{-3}):(a^{-2}\cdot b^{-5}\cdot c^{-4}) = a^{-4-(-2)}\cdot b^{-3-(-5)} \cdot c^{-3-(-4)} = a^{-2}\cdot b^{2}\cdot c[/tex]
[tex]b)\\(\frac{a^{2-n}}{a^{2}})^{-2} = (\frac{a^{2}}{a^{2-n}})^{2} = (\frac{a^{2}}{\frac{a^{2}}{a^{n}}})^{2} = (\frac{a^{2}\cdot a^{n}}{a^{2}})^{2} = (a^{n})^{2} = a^{2n}[/tex]
