**Решение:**
1. x⁶ * x⁸ = x^(6+8) = x¹⁴
2. x⁸ : x⁶ = x^(8-6) = x²
3. (x⁴)³ = x^(4*3) = x¹²
4. \frac{x^{4}·x^{2}}{x^{9}} = \frac{x^{4+2}}{x^{9}} = \frac{x^{6}}{x^{9}} = x^{6-9} = x^{-3} = \frac{1}{x^{3}}
**Ответ:**
1) x¹⁴
2) x²
3) x¹²
4) \frac{1}{x^{3}}