3. Упростить: 1) (a²a⁸b³)/(a⁹b²); 2) (c³d⁵c⁹)/(c¹⁰d⁷); 3) (x¹⁸y¹⁴)/(x⁴y⁷x⁶); 4) (x⁹y³x¹⁵y⁸)/(xy⁶x¹⁰y).

1. a²⁺⁸⁻⁹b³⁻² = ab.
2. c³⁺⁹⁻¹⁰d⁵⁻⁷ = c²d⁻² = c²/d².
3. x¹⁸⁻⁴⁻⁶y¹⁴⁻⁷ = x⁸y⁷.
4. x^{9+15−1−10}y^3+8−6−1 = x¹³y⁴.

Ответ: 1) ab; 2) c²/d²; 3) x⁸y⁷; 4) x¹³y⁴.