x-y分之x² - y-x分之y²-2xy

来源：学生作业学帮网编辑：学帮网时间：2024/07/02 01:29:36

x² /(x-y) - (y²-2xy)/(y-x)
=x² /(x-y) + (y²-2xy)/(x-y)
=(x² + y²-2xy)/(x-y)
=(x-y)²/(x-y)
= x-y