1. Разложите на множители:
1) а³ + 8b³;
3) -5m² + 10mn – 5n²; 5)а( в 4 степени) – 81.
2) x²y – 36y³;
4) 4аb - 28b + 8a – 56;

2. Упростите выражение:
a(a + 2)(a – 2) – (a – 3)(a² + 3a + 9).

3. Разложите на множители:
1) x³ - 8x² + 16x;
3) a - - ab³ + b³.
2) 9m² + 6mn + n² - 25;
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