xy-x-y+1/y²-2y+1将其化简?

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xy-x-y+1/y²-2y+1将其化简?

xy-x-y+1/y²-2y+1
(y-1)x-(y-1)/(y-1)²
(y-1)(x-1)/(y-1)²
x-1/y-1

(x-1)(y-1)/(y-1)^2

应该是因式分解吧