1. 3а²а + 4а³ + 2b² - bb
2. 3a × 5bb + 2b × 6c - a × 2b × 4b - 2 × 3bc
3. 6a × 3c² - 2a²c + 4ac² - 8a × 2ac
4. 7a × 3a² - 8a³ - 10 + 6 × 7
5. 100a × b + 15b - b × 20a - 2 × 5b
6. 80a × ab + b × 5a² - 4c × c + c × 5c
7. 4a × 3ab² + 30a² × b² - 6a²b × 3b
8. 2a × 5ad³ + 5ad × 3a - 6ad × 2d² - 4a² × 8d
9. 6n² × 2mn - 35mn - 3m × 2n³
10. 6a² - 8a³ - 2aa - 6aa²