xy-x-y+1/y²-2y+1将其化简?

xy-x-y+1/y²-2y+1将其化简?
xy-x-y+1/y²-2y+1将其化简?

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