x+2008y=2009 2008x+y=2009 x=?y=?x+2008y=20092008x+y=2009请问x=?y=?正确的

已知(x^+y^)(x^+y^-2008)=2009 当x=2008,y=2009时,求代数式(x-y)/x/(x-(2xy-y^2)/x) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 y=(√x-2009+ √2009-x)+2008,求x-y的值 x+2008y=2009 2008x+y=2009 x=?y=?x+2008y=20092008x+y=2009请问x=?y=?正确的 化简 x / y(x+y) - y / x(x+y) = 已知x^2+y^2-2x+2y=-2,求代数式x^2008+y^2009?已知x^2+y^2-2x+2y=-2,求代数式x^2008+y^2009? 2008x-2007y=2009且2007x-2008y=2006则y和x于 已知x=2007,y=2008,则(x+y)*(x^2+y^2)/(x^4-y^4)=__ /x-y/=x-y,且/x/=2007,/y/=2008,求x+y的值 已知(2007x+2008y=2009)而且(x+y=1)问x=?,y=? 2009x+2008y=2007,且2011x+2010y=2009.x=多少,y=多少 2007x-2008y=2009,x+y=1,求4017x-4013y+4018的值? .(x^2+y^2)(x^2+y^2-2008)=2009,求x^2+y^2的值 x-2y=2008求{(3x+2y)(3x-2y)-(x+2y)(5x-2y)}/8x x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 若2008x+2009y=2007,2009x+2008y=2010,求（x+y）的3次方+（x-y）的3次方的值 解方程组23x+17y=63,17x+23y=57 解方程组2007x+2008y=2006,2008x+2007y=2009