Ответ:
(9x² - у²)/(27х³ - у³) = (3x - y)(3x + y)/(3x - y)(9x² + 3xy + y²) = (3x + y)/(9x² + 3xy + y²)
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Ответ:
(9x² - у²)/(27х³ - у³) = (3x - y)(3x + y)/(3x - y)(9x² + 3xy + y²) = (3x + y)/(9x² + 3xy + y²)