6) (x⁴)⁵.x⁸ x⁶

$$\frac{(x^4)^5 \cdot x^8}{x^6} = \frac{x^{4 \cdot 5} \cdot x^8}{x^6} = \frac{x^{20} \cdot x^8}{x^6} = \frac{x^{20+8}}{x^6} = \frac{x^{28}}{x^6} = x^{28-6} = x^{22}$$

Ответ: x²²