Разложите на множители 1) 12x^2y-18xy^2 2)15a^4b^3-25a^3b^4 3)mn-3m+2n-6 4)x^2-xy-2y^2

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)