若x^2+y^2-10x+6y+34=0,则x+y=?

若x^2+y^2-10x-6y+34=0,求（x-y)/(x+y)的值 若x^2+y^2-10x+6y+34=0,则x+y=? 已知x、y满足：x^2+y^2+6x-10y+34=0,求y-x的值 若x^2+2x+y^2-6y+10=0,则x-y 若x²+2x+y²-6y+10=0求x y 若X^2+Y^2+2X-6Y+10=0,先化简X+Y分之Y^2,分之X-Y分之X-1 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 若X^2+y^2+2x-6y+10=0,求y^2x-x^2011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 求f(x,y)=x+y+7的最大值,使(x,y)满足x+2y≤10,2x+y≥6,y≥0 x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知x^2+y^2--6x--2y+10=0,求x+y/x--y 已知x^2+y^2+6x-2y+10=0,求x+y/x-y的值谢谢