2x-y=10 x+y=0 x=?y=?

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 x*x+2x+y*y-4y+5=0 x= y= (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x+y)(x+y-10)+25=0,且x-y=3,求x,y (X,Y) f(x,y)={12y^2,0 设Z=X+Y,其中X,Y满足X+2Y>=0,X-Y 已知x>0,Y>0,如何证x^2/y+y^2/x>=x+y x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 填空：x-y/x+y=( )/x^2-y^2 （x-y)2•(y-x)³(x-y)=? 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)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*y)的值 {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 y+y'-2y=2x