[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-

[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y- x^2y+4xy+4y （-3x^y+2xy)-( )=4x^+xy x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 已知x-y=4xy，则2x+3xy-2yx-2xy-y 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)} 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! xy=-2,x+y=3,求代数式（4xy+12y)+[7x-(3xy+4y-x)] 已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值 已知x+y=5,xy=2,求5x+4y-3y-2y+xy的值