因式分解：(x+y-2xy)(x+y-2)+(xy-1)

因式分解：(x+y-2xy)(x+y-2)+(xy-1)

[@貪食蛇進化論頻道]

最後忘記換回去啦

[@blxotaku]

Final is ((X-1)(1-Y))^2
Right? Wrong?