已知x^2=8+5x,y^2=8+5y,且x≠y,则x+y=?

已知,xyz≠0,且2x+3y=3x-8y=5z,则(x+y)/(x-y)的值. 已知xyz≠0,且2x+3y=3x-8y=5z,则x+y/x-y的值是 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x,y满足-5|x-2y|+8|y-1\2|=0则x=( ),y=( ) 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值 已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/(8x)) 已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值 已知：x*x+√3y=√5,y*y+√3x=√5,且x≠y,求 y/x+x/y 已知XYZ不等于0,且2X+3Y=3X-8Y=5Z,求X+Y\X-Y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