2. Разложите на множители: 1) $$18xy - 6x^2$$; 2) $$15a^6 - 3a^4$$; 3) $$4x - 4y + cx - cy$$.

1) $$18xy - 6x^2 = 6x(3y - x)$$ 2) $$15a^6 - 3a^4 = 3a^4(5a^2 - 1)$$ 3) $$4x - 4y + cx - cy = 4(x - y) + c(x - y) = (x - y)(4 + c)$$ **Ответ:** 1) $$6x(3y - x)$$ 2) $$3a^4(5a^2 - 1)$$ 3) $$(x - y)(4 + c)$$