8) (x⁴)³.(x⁵)³ x¹⁰

$$\frac{(x^4)^3 \cdot (x^5)^3}{x^{10}} = \frac{x^{4 \cdot 3} \cdot x^{5 \cdot 3}}{x^{10}} = \frac{x^{12} \cdot x^{15}}{x^{10}} = \frac{x^{12+15}}{x^{10}} = \frac{x^{27}}{x^{10}} = x^{27-10} = x^{17}$$

Ответ: x¹⁷