分解因式:(x+y-2xy)(x+y-2)+(xy-1)^2

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分解因式:(x+y-2xy)(x+y-2)+(xy-1)^2
分解因式:(x+y-2xy)(x+y-2)+(xy-1)^2

分解因式:(x+y-2xy)(x+y-2)+(xy-1)^2
(x+y-2xy)(x+y-2)+(xy-1)^2
=(x+y)^2--2(xy+1)(x+y)+(xy+1)^2
=(x+y-xy-1)^2=(x-1)^2(y-1)^2

答案是
(x + y - 2xy)(x + y - 2) + (xy - 1)^2
=(X+Y)^2-2(X+Y)-2XY(X+Y)+4XY+X^2Y^2-2XY+1
=(X+Y)^2-2(X+Y)(XY+1)+(XY+1)^2
=(X+Y-XY-1)^2