x²+4y²+2x+4y+2=0 求x-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? 4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/（x+2y-12Y²/x-2y)的值 已知x² +y²+5/4=2x+y,求y-x的值 x²+4y²-2x+12y+10=0求X,Y值 求x²+y²-2x+4y+1的最小值 求x,y的值 x²+2xy+4x-12y+22=0 若|x+2y-1|+y²+4y+4=0,求（2x-y）²-2（2x-y)(x+2y)+(x+2y)& 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. 若|x+y-1|+（x-y-2)²=0,求代数式（x+2y)(x-2y）-（2x-y)(-y-2x)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=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 如果2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值 已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y的值