X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=?

X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=? 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 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 已知x^2-2x+y^2+6y+10=0,求分式x-y/x+y的值 已知：4x^2+y^2-4x-6y+10=0,求y/x-x/y的值 已知x、y满足：x^2+y^2+6x-10y+34=0,求y-x的值 若x^2+y^2-10x-6y+34=0,求（x-y)/(x+y)的值 已知实数x, y满足x²+y²-2x+6y+10=0,求y∧-x. x^2+2x+y^2-6y+10=0,求x^2+2y y^2-2y+x^2-6x^2+10=0求[(-2)^x]^y, 已知x^2+2x+y^2-6y+10=0 求（x+y)^2 若x^2+2x+y^2-6y+10=0,则x-y