1) 20a³ × (5a)² = 20a³ × 25a² = 500a^5
2) (3x⁶y³) × (-1xy²) = -3x⁷y⁵
3) (-0.55x²⁴-² + ka^n-k) × (40an+¹ × xk+3n+4) = -22x^24 + k(a^n-k) × 40a^(n+1) × x^(k+3n+4)
1) 20a³ × (5a)² = 20a³ × 25a² = 500a^5
2) (3x⁶y³) × (-1xy²) = -3x⁷y⁵
3) (-0.55x²⁴-² + ka^n-k) × (40an+¹ × xk+3n+4) = -22x^24 + k(a^n-k) × 40a^(n+1) × x^(k+3n+4)