237. $$\frac{\sqrt{15}}{\sqrt{6} \cdot \sqrt{10}}$$

$$\frac{\sqrt{15}}{\sqrt{6} \cdot \sqrt{10}} = \frac{\sqrt{15}}{\sqrt{6 \cdot 10}} = \frac{\sqrt{15}}{\sqrt{60}} = \sqrt{\frac{15}{60}} = \sqrt{\frac{1}{4}} = \frac{1}{2}$$ Ответ: $$\frac{1}{2}$$