若xˆ2+yˆ2-xy-10x-10y+100≤0,则x-y=

7.X*X+2X+Y*Y-6Y+10=0,则xy=? 若x+y=10 xy=-1 则x²+y²=(x+y)²-2xy= 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)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y- 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若x²-2xy+y²+6y+10=0,则x的y次方= 若3x-3y-x²+2xy-y²+10=0求x-y x^2-2xy+y^2+6y+10=0求x,y的值. x的平方-2xy+y的平方-6y+10=0,求x,y 若2x平方+3xy-2y平方=0,求x+y/x-y 若正实数x.y满足x+y=xy,则x+2y的最小值 若(3xy+2)+|7-x-y|=0,求代数式（5xy+10y）-[-5x-（4xy-2y+3x）]的值.