已知M/x2−y2=2xy−y2x2−y2+x−yx+y,则M=_.

问题描述:

已知

M
x2y2
2xy−y2
x2y2
+
x−y
x+y
,则M=______.

M
x2y2
=
2xy−y2
x2y2
+
(x−y)2
x2y2

M
x2y2
=
2xy−y2+x2−2xy+y2
x2y2

M
x2y2
=
x2
x2y2

∴M=x2
故答案为:x2