如果5x^2+5y^2+8xy+2x-2y+2=0,则x-y=?

已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-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* 若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( ) 如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值. 如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少 已知x+4y-2x+8y+5=0,求x^4-y^4/2x+xy-y·2x-y/xy-y÷(x+y/y)的值. 已知x,y>0 2x+y+3=xy 求5x+4y最小值 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-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+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy