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= 6a³ +a -a³ +4a
= 5a³ + 5a
NOMER 2
= k² + 9k³ + 7k² - k³
= 8k³ +8k²
NOMER 3
= m² - 3m -3m³ -3m²
= -2m³ -2m² -3m