化简:(x+y-4xy/x+y)*(x-y-4xy/x-y)=
{x-y+(4xy/x-y)}{x+y-(4xy/x+y)}怎么解?
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
x^2y+4xy+4y
(-3x^y+2xy)-( )=4x^+xy
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
xy-1+x-y