若x＝1,y=2,求1／xy＋1／﹙x+1﹚·﹙y+1﹚＋1／﹙x＋2﹚·﹙y＋2﹚…………+1／﹙x+2009)·(y+2009)的值

若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若xy满足x²+2x+y-2√y-1=-1,求xy, 若x,y满足x^+2y^-2xy+1=0,求xy的值 1-2/x+y=xy,4y+6x=xy.求xy的解? 若1/x-1/y=1/3,求(2x+3xy-2y)/(x-3xy-y) 已知x-y=11求(xy-1)的平方＋(x+y-2)×(x+y-2xy)的值 若1/x-1/y=3,求(2x+3xy-2y)/(x-2xy-y)的值 若1/x -1/y =3,求(2x+3xy-2y)/(x-y-2xy) 若1/X—1/Y=2,求3X-2XY-3Y/X-2XY-Y 若1/x-1/y=3,求（2x-3xy-2y)/(x-2xy-y)的值 若1/X-1/Y=2,求3X+XY+3Y/X-XY-Y的值 若1/X-1/Y=3,求5X+2XY-5Y/X-4XY-Y 若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值 若(1/x )-(1/y)=3,求(3x+4xy-3y)/(x-2xy-y)的值. 1若x+2y=0 ,xy不等于0,求分式 x^2+2xy / xy+y^2 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) 已知xy-x-y=11,求(xy-1)^2+(x+y-2)(x+y-2xy)的值.