[email protected] , ответ добавлен 15.12.2017 в 02:20

1). 12x²y - 18xy² = 6xy(2x - 3y)
2). 15a⁴b³ - 25a³b⁴ = 5a³b³(3a - 5b)
3). mn - 3m + 2n - 6 = n(m + 2) - 3(m + 2) = (n - 3)(m + 2)
4). x² - xy - 2y² = x² - y² - xy - y² = (x - y)(x + y) - y(x + y) = (x + y)(x - 2y)

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