а) 36у – у³ = 36у × (1 – у²) = 36y × (1 – у)(1 + y)
б) – 8х² + 16ху – 8у² = 8х² – 16ху + 8у² = 8 × (4x² – 4xy + 4y²) = 8 × ((2x)² – 2x × 2y + (2y)²) = 8 × (2x – 2y)²
