ЛФ
Людмила Фанасова
(3x+y)(2x-5y) - 6(x-y)^2 =
= 6x^2 - 2xy - 15xy - 5y^2 - 6x^2 + 12xy - y^2 =
= - 5xy - 6y^2 =
= -y*(5x + 6y)
(-2x^3 * y)^3 * (-5x^2 * y)^2 =
= (-2)^3 * x^6 * y^3 * (-5)^2 * x^4 * y^2 =
= (-8) * x^10 * y^5 * 25 =
= -200 * x^10 * y^5