а) x(a-x) + y(x-a) = -x^2 + ax + xy - ay = -x(x-a) + y(x-a) = (x-a)(y-x)б) b(c-b) - d(b-c) = -b(b-c) -d(b-c) = -(b-d)(b-c)в) 2x(3x-5)+17(5-3x) = 6x^2 - 10x + 85 - 51x = 6x^2 - 61x + 85г) (a-b)^2 - a(b-a)^2 = a^2 - 2ab + b^2 - ab(a-b)^2 = a^2 - 2ab + b^2 - a^2b + ab^2 = b^2 - ab - a^2д) (x-y)^2 + b(y-x) = x^2 - 2xy + y^2 - by + bx = x^2 - 2xy + y^2 + x(b-y) = (x-y)(x-y+b)е) a(x-5)^2-b(5-x) = a(x^2 - 10x + 25) - b(5-x) = ax^2 - 10ax + 25a - 5b + bx = ax^2 + bx - 10ax - 5b + 25a.
а) x(a-x) + y(x-a) = -x^2 + ax + xy - ay = -x(x-a) + y(x-a) = (x-a)(y-x)
б) b(c-b) - d(b-c) = -b(b-c) -d(b-c) = -(b-d)(b-c)
в) 2x(3x-5)+17(5-3x) = 6x^2 - 10x + 85 - 51x = 6x^2 - 61x + 85
г) (a-b)^2 - a(b-a)^2 = a^2 - 2ab + b^2 - ab(a-b)^2 = a^2 - 2ab + b^2 - a^2b + ab^2 = b^2 - ab - a^2
д) (x-y)^2 + b(y-x) = x^2 - 2xy + y^2 - by + bx = x^2 - 2xy + y^2 + x(b-y) = (x-y)(x-y+b)
е) a(x-5)^2-b(5-x) = a(x^2 - 10x + 25) - b(5-x) = ax^2 - 10ax + 25a - 5b + bx = ax^2 + bx - 10ax - 5b + 25a.