20) $$\sqrt{0} - \sqrt{\frac{1}{36}} =$$

Решение:

$$\sqrt{0} - \sqrt{\frac{1}{36}} = 0 - \frac{\sqrt{1}}{\sqrt{36}} = 0 - \frac{1}{6} = -\frac{1}{6}$$

Ответ: $$\frac{-1}{6}$$