计算下面式子{x-y+[(4xy)/(x-y)]}{x-y-[(4xy)/(x-y)]}

计算：(xy-x²)×x-y/xy （x^2+xy/x-y)/（xy/x-y)计算 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 {x-y+(4xy/x-y)}{x+y-(4xy/x+y)}怎么解? 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) 计算(x-y)(x平方+xy+y平方)-(x+y)(x平方-xy+y平方) x-y/xy-y^2计算 x^2y+4xy+4y 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4 计算[4/(x^2-y^2)+(x+y)/(xy^2-x^2y)]除[(x+2y)(x-y)/(x^2+2xy^2) 计算4xy+（x-2y）的平方+(x+3y)(3y-x) 计算:(x-2y)(1+x+2y+4y^2+2xy+x^2)