a)
\sqrt{\frac{3}{4}}=\frac{\sqrt3}{2}=\frac{1}{2}\sqrt3
\sqrt{\frac{2}{25}}=\frac{\sqrt2}{5} = \frac{1}{5}\sqrt2
\sqrt{\frac{5}{49}}=\frac{\sqrt5}{7}=\frac{1}{7}\sqrt5
b)
\sqrt[3]{\frac{5}{27}}=\sqrt[3]{\frac{5}{3^3}}=\frac{1}{3}\sqrt[3]5
\sqrt[3]{\frac{7}{64}}=\sqrt[3]{\frac{7}{4^3}}=\frac{1}{4}\sqrt[3]7
\sqrt[3]{\frac{11}{125}}=\sqrt[3]{\frac{11}{5^3}}=\frac{\sqrt[3]{11}}{5}=\frac{1}{5}\sqrt[3]{11}