а) -5a(5+ф) + a(5+ф)б) (3x-2y)^2 = (3x-2y)(3x-2y) = 9x^2 - 6xy - 6xy + 4y^2 = 9x^2 - 12xy + 4y^2в) (0.1a^3 - 5b)^2 = (0.1a^3 - 5b)(0.1a^3 - 5b) = 0.01a^6 - 0.5a^3b - 0.5a^3b + 25b^2 = 0.01a^6 - a^3b + 25b^2г) (x-2)(x^2+2x+4) = x(x^2+2x+4) - 2(x^2+2x+4) = x^3 + 2x^2 + 4x - 2x^2 - 4x - 8 = x^3 - 8
а) -5a(5+ф) + a(5+ф)
б) (3x-2y)^2 = (3x-2y)(3x-2y) = 9x^2 - 6xy - 6xy + 4y^2 = 9x^2 - 12xy + 4y^2
в) (0.1a^3 - 5b)^2 = (0.1a^3 - 5b)(0.1a^3 - 5b) = 0.01a^6 - 0.5a^3b - 0.5a^3b + 25b^2 = 0.01a^6 - a^3b + 25b^2
г) (x-2)(x^2+2x+4) = x(x^2+2x+4) - 2(x^2+2x+4) = x^3 + 2x^2 + 4x - 2x^2 - 4x - 8 = x^3 - 8