x^2-5xy-6y^2=0

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 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 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 2x^+xy-y^-4x+5y-6=? 已知x大于0 y大于0 且x+6y=5根号xy 求x+根号xy+2y分之2x+根号xy-y的值已知x大于0 y大于0 且x+6y=5根号xy求x+根号xy+2y分之2x+根号xy-y的值 4xy-[(x²+5xy-y²)-(3xy-1/2y)]x=3,y=-6 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） 1.已知x+y=-4,xy=3,求5（2分之1xy+2y）+[6x-(2xy+y-3x)]的值2.已知（x+3）^2+|x-y+10|=0求代数式5x^2y-[2x^2y-(3xy-xy^2)-3x^2]-2xy^2-y^2的值 若x-y=5,xy=6,求x^2-xy^2和x^2y+xy^2 已知x^2+9y^2-2x-6y+2=0,求{-（xy/（x-y）^2}^4*(y^2-xy/x)^3*x^4/y^10/(x/xy-y^2)^5的值 x^2-4xy+5y^2+6y+9=0,x+y= 方程组 x^2-xy-2y^2+x+4Y-2=0和2X^2-xy-y^2-x-5y-6=0 5x^2-7xy-6y^2=0 x^2-5xy-6y^2=0 若x+y=5,xy=6,求x^2y+xy^2的值 xy=6,x-y=5,x^2y+xy^2