Thjeshto:

a $\sqrt{\frac{7}{4}} = \frac{\sqrt{7}}{\sqrt{4}}$

b $\sqrt{\frac{5}{9}}$

c $\sqrt{\frac{12}{49}} = \frac{\sqrt{12}}{\sqrt{49}}$

d $\sqrt{\frac{18}{25}}$

e $\left(\sqrt{\frac{3}{8}}\right)^2$