37) $$\frac{x^5 \cdot x^4 \cdot x^9}{x^6 \cdot x^4} = \frac{x^{5+4+9}}{x^{6+4}} = \frac{x^{18}}{x^{10}} = x^{18-10} = x^8$$
Ответ: $$x^8$$