Запишите в виде многочлена: (x + 2y)²

  1. x² + 4xy + 4
  2. x² − 4xy + 4y²
  3. x² + 4xy + 4y²
  4. x² + 4y²

📝 Detailed explanation

По формуле сокращенного умножения: (x + 2y)² = x² + 2 × x × 2y + (2y)² = x² + 4xy + 4y².
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