(x一y+4xy/x-y)(x+y-4xy/x+y)

{x-y+(4xy/x-y)}{x+y-(4xy/x+y)}怎么解? x^2y+4xy+4y (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy) xy-1+x-y 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? x²/xy-x/y 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 （-3x^y+2xy)-( )=4x^+xy （xy-x^2)乘以(xy)/(x-y) 计算：(xy-x²)×x-y/xy x^5+y^5-(x^4y+xy^4) xy-[x+2y+0.5(x-4)*(y-2)]