若x^2+2y^2-2xy+4y+4=0,求x^y的值

已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)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1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值! 已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值. 已知X+Y=2XY,求4X-5XY+4Y 除以X+XY+Y 的值 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. 若x平方-2xy+y平方-x+y-6=0,求x-y+4的值 x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值 已知：x-y=1,xy=-2.求：(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值