已知|x-y+3|+(2x+y)^2=0,求4x+3y的值 已知|x-y+3|+(2x+y)^2=0,求4x+3y的值

已知4x-2y=0,求x-y/3x+2y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2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 已知x^2+3xy-4y^2=0(y≠0),求x-y/x+y的值. 已知|2x-3y|+|3x-y-1|=0,求x,y的值. 已知3x-4y/2x+y=1/2 求x/y的值 已知x/y=3/4,求2x-y/x+y的值. 已知x^2-4x+y^2-10y+29=0,求x^2y^2+2x^3y^2+x^4y^2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