已知X,Y是非零复数,X^2+XY+Y^2=0,[X/(X+Y）]^2005+[Y/(X+Y)]^2005=?

已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? x和y是非零实数,如果(2x-y)/3y=y/x,那么x/y=? 已知2x^2-3xy+y^2=0,xy不等于零,求x/y+y/x的值 已知x,y是非零实数,如果xy/(x+y)=5,则(1/x)+(1/y)=多少? 已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)} 已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值. 已知5x^2-4xy+y^2+y-2x+1=0,求（x-y）^2005 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y) 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知x^2+xy-2y^2=0 (x不等于0,y不等于0）,求x/y-y/x-(x^2+y^2)/xy的值 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知（x+2）^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy