若2x+y=0,求(x^2+xy+y^2)/(2xy-x^2)

若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若2x+y=0,求(x^2+xy+y^2)/(2xy-x^2) 若集合{x,xy,lg(xy)}={0,|x|,y},求log8(x^2+y^2) 若x^2+xy+y=14,y^2+xy+x=28,求x+y 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若正整数X,Y满足2X+Y--XY=0,求X+Y的最小值 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 若X+Y=0,XY=11,求X^2-XY+Y^2的值. 若x,y满足x^+2y^-2xy+1=0,求xy的值 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x 已知x-2y=0,求(x/y-y/x)乘xy/x^2-2xy+y^2 已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y 已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y 已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y 若两个正实数x,y满足x^2+2xy-3y^2=0,求x^2+xy+y^2/x^2-xy+y^2 若x^2-xy-3y^2=0(y>0),求x/y的值 若x,y 为正整数.x^2+y^2+4y-96=0,求xy