Выполните деление:
\(1)\ \frac{\vphantom{^0}5m-2n}{10k}:\frac{5m-2n}{10k^2};\)
\(2)\ \frac{\vphantom{^0}p+3}{p^2-2p}:\frac{p+3}{4p-8};\)
\(3)\ \frac{a^2-b^2}{2ab}:\frac{a+b}{ab};\)
\(4)\ \frac{a^2-16}{a-3}:\frac{a+4}{a-3};\)
\(5)\ \frac{y-9}{y-8}:\frac{y^2-81}{y^2-16y+64};\)
\(6)\ (x^2-49y^2):\frac{\vphantom{^0}x-7y}{x}.\)