x／2=y／4=x／5≠0,求x+2y-x／2x-y+3x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.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值 已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值. 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 已知4x-2y=0,求x-y/3x+2y的值 x平方+y平方-2x-4y+5=0求x,y的值. 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(