5(x-y)^2-(x-y)-8(x-y)^2-3(x-y)

5(x-y)^2-(x-y)-8(x-y)^2-3(x-y) 数学(x-y)^5*(y-x)^3*(x-y)^2 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8 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) 2(x-y)+3（x+y）2-5(x-y)-8（x+y）2-（x-y） 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 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) 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