已知x-2y-5=0,求2x-4y-2 过程详细啊

已知4x^2+y^2-4x+4y+5=0,求x,y 已知x²+4x+y-2y+5=0求x+2y 已知x²+y²-2x+4y+5=0,求x+y 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知X^2+Y^2-2X-4Y+5=0,求分式Y/X-X/Y的值 已知x²+y²-2x-4y+5=0,求分式y/x-x/y的值. 已知x、y满足x²+y²+2x-4y+5=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? 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 已知x²+4y²-4x+4y+5=0,求：(x^4-y^4)/[(2x-y)(x+y)]*(2x-y)/(xy-y²)/[(x²+y²)²/y²] 已知x²+4y²-4x+4y+5=0,求(2x-y)(x+y)/x四次方-y四次方×xy-y²/2x-y÷(y/x²+y²)² 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x^2+4y^2-2x-2x+8y+5=0,求x^2-y^2/2x^2+xy-y^2*2y-y/xy-y/(x^2+y^2/y)^2的值 已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/x-y的值 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 已知x^2+4y^2-4x+8y+8=0,求x+y