(3а² + 2аb - b²) - (2a² - 3ab - 2b²) =
= 3a² - 2a² +2ab + 3ab - b² + 2b² =
= a² +5ab + b²
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(3а² + 2аb - b²) - (2a² - 3ab - 2b²) =
= 3a² - 2a² +2ab + 3ab - b² + 2b² =
= a² +5ab + b²