5x^2+7xy+6y^2=0求x/y
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
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*
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知x^2+y^2-4x+6y+13=0求(xy+y^2/5x^2-5xy+xy+y^2)·(5/x+y)-(y/x-y
已知x>0,y>0,x+根号xy-6y=0,求4x+5根号xy-6y分之x+2根号xy
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知xy²=-6,求xy(x^3y^7-3x^2y^5-11.5y)的值
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
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^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值.