xy-x-y+1/y²-2y+1
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![xy-x-y+1/y²-2y+1](/uploads/image/z/2556775-55-5.jpg?t=xy-x-y%2B1%2Fy%26%23178%3B-2y%2B1)
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xy-x-y+1/y²-2y+1
xy-x-y+1/y²-2y+1
xy-x-y+1/y²-2y+1
xy-x-y+1/y²-2y+1
={x(y-1)-(y-1)}/(y-1)²
=(x-1)(y-1)/(y-1)(y-1)
=(x-1)/(y-1)
原式=[x(y-1)-(y-1)]/(y-1)²
=(y-1)(x-1)/(y-1)
=x-1
xy-x-y+1/y²-2y+1=(x-1)/(y-1)