x^2+y^2-2x-2y+2xy+1= 因式分解

.(x+y-2)(x+y-2xy)+(xy-1)^2 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 (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) （x^2+xy/x-y)/（xy/x-y)计算 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知x+y=1,xy=-2,则x²y+xy²-2xy {(x-y/x^2-2xy+y^2)-(xy+y^2/x^2-y^2)}*(xy/y-1) f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出, 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 1-2/x+y=xy,4y+6x=xy.求xy的解? x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? （x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2 因式分解（x+y-2xy)(x+y-2)+(xy-1)^2设x+y=a,xy=b, 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)