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

2x^+xy-y^-4x+5y-6=? 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*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 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 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) x^2-4xy+5y^2+6y+9=0,x+y= 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^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 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>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 方程组 x^2-xy-2y^2+x+4Y-2=0和2X^2-xy-y^2-x-5y-6=0 x+y+xy=5 (x^2)y+x(y^2)=6 解方程组 已知x^2-6xy+9y^2=0,求(x-y)/(x+y) 6（x-y)-7(xy)=21,2(x-y)-5(x+y)=-1 已知x,y>0 2x+y+3=xy 求5x+4y最小值