\(\sqrt{50}=\sqrt{25}⋅\sqrt{2}=5\sqrt{2}\text{.}\)

\(2\sqrt{63}=2⋅\sqrt{9}⋅\sqrt{7}=2⋅3⋅\sqrt{7}=6\sqrt{7}\text{.}\)

\(\sqrt{\frac{25}{81}}={\sqrt{25} \over \sqrt{81}}=\frac{5}{9}\text{.}\)

\(\sqrt{1\frac{3}{49}}=\sqrt{\frac{52}{49}}={\sqrt{52} \over \sqrt{49}}={\sqrt{52} \over 7}=\frac{1}{7}\sqrt{52}=\frac{1}{7}⋅2⋅\sqrt{13}=\frac{2}{7}\sqrt{13}\text{.}\)