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=> 125x³ - 25x²y + 5xy² - 25x²y + 25xy² - y³
=> 125x³ - 50x²y + 30xy² - y³.
2. (3x + 2y)(9x² - 6xy + 4y²)
=> 27x³ - 18x²y + 12xy² + 18x²y - 12xy² + 8y³
=> 27x³ + 8y³