Помните решить ,а,б,в,прошууу

Решите задачу:

$1)\\ (\frac{m^{2}}{n^{^{3}}})^{3} : (\frac{2m^{4}}{n^{5}})^{2} = \\\\ = \frac{m^{6}}{n^{9}} * \frac{n^{10}}{4m^{8}} = \frac{n}{4m^{2}}$
$2)\frac{x^{2}-4x}{8a^{3}} : \frac{x^{2}-16}{16a^{4}} = \frac{x(x-4)}{8a^{3}} * \frac{16a^{4}}{(x-4)(x+4)} = \frac{2xa}{x+4}$
$3)\\ \frac{4b^{2}-4ab+a^{2}}{a^{2}-4b^{2}} = \frac{(a-2b)^{2}}{(a-2b)(a+2b)} = \frac{a-2b}{a+2b}$