x'2+2x+y'2-8y+17=0,求x'y的值

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=? x'2+2x+y'2-8y+17=0,求x'y的值 x^2+2x+y^2-8y+17=0,求x^y x+2x+y-8y+17=0,求x∧y 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 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.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的值 若x^2+y^2+2x-8y=-17,求y/x的值 若x^2+y^2+2x-8y=-17,求y/x的值. x^2+2x+y^2-8y+16=0,求y/x的值 已知x^2+4y^2-4x+8y+8=0,求x+y 求x ,y 9x^2+4y^2-12x-8y+8=0 2x+8y-xy=0(x>0,y>0),求x+y的最小值 x^+2x+1+y^2-8y+16=0求y/x x^2+y^2-8x+10y+41=0求(x+y)^2013 设x>0,y>0,x+y=1,求8/x+2/y的最小值