已知x-2y=0,求5（x-2y)-3(2y-x)-60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*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-3y=0(y≠0)求2x+5y/3x-2y的值 已知4x-2y=0,求x-y/3x+2y的值 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 已知3x-2y/x+y=5/3求x；y的值 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 已知x-3y=0,求（2x+y)/(x^2-2xy+y^2)*(x-y)的值 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)*(x-y)的值. 已知x-3y=0,求(2x+y)(x-y)/x^2-2xy+y^2的值 已知x-3y=0,求2x+y/x-2xy+y乘(x-y)的值