若x-y=-1,求x^2+y^2+2xy-4x+4y+8 的值.(求算式)

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x^2+xy+y=14,y^2+xy+x=28,求x+y 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 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 1-2/x+y=xy,4y+6x=xy.求xy的解? 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=1/3,求(2x+3xy-2y)/(x-3xy-y) 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. 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若x²-4xy+5y²-2y+1=0,求x,y