x-y分之x² - y-x分之y²-2xy
问题描述：
x-y分之x² - y-x分之y²-2xy
答
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如有帮助，敬请采纳。