已知x^2+4xy-12y^2=0,其中xy≠0,求x/y.

已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y的值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值 已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)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x²-7xy+12y²=0求x²-xy+y²/2xy的值 已知y=3xy+x,求代数式2x+5xy-2y/x-2xy-y的值(xy≠0) 已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值. 已知x^2+y^2+x^2y^2-4xy+1=0 求(x-y)^2008-(xy)^2008 已知X²+Y²+X²Y²-4XY+1=0 求:（X-Y)^2008-(XY)^2 已知x,y>0 2x+y+3=xy 求5x+4y最小值 (1)已知x-y=6,xy=4,求xy^-1+x^-1y的值； (2)已知x^2+y^2=3xy且xy≠0,求x^2y^