（X+2Y)(5X-2Y)

数学(x-y)^5*(y-x)^3*(x-y)^2 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) （X+2Y)(5X-2Y) (2X-3y)-(5x-y) 1、x(x-y)(x+y)-x(x+y)^2 1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [（x+y)(x-y)-(x-y)^2+2y(x-y 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y [(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x) [(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x 2(2x+3y)(3x+2y)-(6x-y)(2x-5y) 化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x (2x -y)(3x-2y)+(y-x)(2x-5y)