若2x^2-3xy+2y^2=0,x>0,y>0,x+y/x-y

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* 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*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)} 若2x平方+3xy-2y平方=0,求x+y/x-y 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y) 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 |x+2y+3|+(2x+y)²=0求x²-xy+y² 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知x^2-3y^2=2xy(x>0,y>0),求代数式x+2y/x-y 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值