1 - х² + 4ху - 4у² =
= 1 - (х² - 4ху + 4у²) =
= 1² - (х + 2у)² =
= (1 - (х + 2у))(1 + (х + 2у) =
= (1 - х - 2у)(1 + х + 2у)
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1 - х² + 4ху - 4у² =
= 1 - (х² - 4ху + 4у²) =
= 1² - (х + 2у)² =
= (1 - (х + 2у))(1 + (х + 2у) =
= (1 - х - 2у)(1 + х + 2у)