ж) Сравним числа $$\sqrt{0,16}$$ и $$\sqrt{\frac{4}{25}}$$.
$$\sqrt{0,16} = 0,4 = \frac{4}{10} = \frac{2}{5}$$
$$\sqrt{\frac{4}{25}} = \frac{\sqrt{4}}{\sqrt{25}} = \frac{2}{5}$$
Так как $$\frac{2}{5} = \frac{2}{5}$$, то $$\sqrt{0,16} = \sqrt{\frac{4}{25}}$$.
Ответ: $$\sqrt{0,16} = \sqrt{\frac{4}{25}}$$.