5x^2y^-2*3x^-3y^2

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) (2X-3y)-(5x-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) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 【x-3y][x+y]-[x-2y][x +2y]-[x-y [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 2(2x+3y)(3x+2y)-(6x-y)(2x-5y) [(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x 化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x (2x -y)(3x-2y)+(y-x)(2x-5y)