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2a²b + 6a² + 2ab² - (a²b - ab² + b²)
2a²b + 6a² + 2ab² - a²b + ab² - b²
2a²b - a²b + 6a² + ab² + 2ab² - b²
a²b + 6a² + 3ab² - b²
Jadi jawabannya yang D. a²b + 6a² + 3ab - b²