а) 2x^2(x-3y) = 2x^3 - 6x^2y
б) (2x-3y)(3y+2x) = 6xy - 9y^2 + 4x^2 - 6xy = 4x^2 - 9y^2
в) (a+b)(a-b)(a+b) = a^2 - b^2 (a+b) = a^3 + a^2b - ab^2 - b^3
а) 2x^2(x-3y) = 2x^3 - 6x^2y
б) (2x-3y)(3y+2x) = 6xy - 9y^2 + 4x^2 - 6xy = 4x^2 - 9y^2
в) (a+b)(a-b)(a+b) = a^2 - b^2 (a+b) = a^3 + a^2b - ab^2 - b^3