已知(x-y)^2+|5x-7y-2|=0,求x,y的值.
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.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=x/x-2y(y不等于0),求x:y的值
已知x-y/x=x/x-2y(y不等于0),求x:y的值
已知2/x+2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
已知2/x 2/y=根号24,求 x/y(x-y) - y/x(x-y)的值
已知x-3y=0(y≠0)求2x+5y/3x-2y的值
已知:x,y满足|2x-y|+|y-1/2|=0,求7x-3y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x-y不等于0,x^2-x=7,y^2-y=7,求x^3+y^3+x^2y+xy^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.