Ответ:
a² - 36 = (a - 6)(a + 6)
4x² - 81y² = (2x + 9y)(2x - 9y)
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Ответ:
a² - 36 = (a - 6)(a + 6)
4x² - 81y² = (2x + 9y)(2x - 9y)