xy-x-y+1/y²-2y+1

来源：学生作业帮助网编辑：作业帮时间：2024/04/29 00:32:05

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)