Ответы на вопрос:
2) (x² + 2xy + y²) - 49 = (x + y)² - 7² = (x + y - 7)(x + y + 7) 3) (a³ + 8) - a(a + 2) = (a + 2)(a² - 2a + 4) - a(a + 2) = (a + 2)(a² - 2a + 4 - a)= = (a + 2)(a² - 3a + 4) 4) (m³ + 27n³) + (m² + 6mn +9n²)=(m + 3n)(m² - 3mn + 9n²) + (m + 3n)²= = (m + 3n)(m² - 3mn + 9n² + m + 3n)
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