已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.

已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值. 已知x-3y=0,求(2x+y)(x-y)/x^2-2xy+y^2的值 已知x-3y=0,求2x+y/x-2xy+y乘(x-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^2+3xy-4y^2=0(y≠0),求x-y/x+y的值. 已知xy=2,x-y=3,求（x+y）（x-y）-y^2-（6x^2y-2xy^2)/2y的值. 已知xy=-2,x-y=3,求(x+y)(x-y)-y平方+(x-y)平方-（6x2y-2xy平方）/2y的值